Timber Column2fg

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    WOOD COLUMNS

    General Design Inf orma tio n

    Invest igat ion of t h e s t r e n g th o f a w o o d c o l u m n o r o t h e r m e m b e r l o a de d t o i n d uc ecom pression paral le l t o grain should take in to considerat ion th e fol lowing factors:Typ e o f co lumn, whe ther so l id , spaced o r bu il t -up mem ber .Shape of cross sec t ion , whe ther r ec t angu la r , r ound o r o ther fo rm.Cross-sectional area of co lumn.Slenderness rat io or r e l a tion o f l a t er a lly unsup por t ed l eng th to l eas td imens ion of cross sect ion or radius of gyrat ion.Degree of en d f ixi ty .A m o u n t a n d t y p e of l oad ing , whe ther ax ia l on ly o r axial com binedwith bending.Design values for species and grade of lu mb er used.

    T y p e a n d S h a p e o f C o l u m nT h e m o s t c o m m o n w o o d c o l u m n i s a s o li d m e m b e r of rectangular or rou nd cross sect ion.Under ce r t a in cond i t ions , member s may be na i l ed or bo l t ed toge ther to form larger columns bu tbecause of the possibi l i ty of movement a long the jo in t , such m ember s have lower load capac itythan sawn or round co lumns .Spaced co lumns which cons i s t of two o r more p ieces wi th spacer b locks be tween a r ef r equen t ly used as top chords of wo od t russes. Because ends of t he m ember s o f a spaced co lumnare rest rained, the degree of end f ix ity fo r a spaced co lumn is grea te r than fo r the typ e of simplecolu mn des cr ibed in the preced ing paragraph. The side members an d spacer blocks of spaced

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    ~

    WOOD COLUMNS

    Figure 12. Slenderness, Ratio Q l d , fo r Simple Sol id Columns

    The cross-sect ional dimension, d , of the column is measured perpendicular to thelongi tudinal axis of the column , on th e face which is paralle l to the plane of la teral sup por t . Sinceeach rectangular column has two faces, and two major axes or planes for lateral su ppo r t , bothslenderness rat ios, , / d l and Z2/d2, should be checked and the larger one used in design.

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    203N O O D C O L U M N S

    Solid ColumnsThe tabulated c omp ression design value, F,, shall he multiplied by all applicable adjustment factors todetermine the allowable compression design value, Fc, for square or rectangular simple, solid columns. The

    column stability factor, C,, shall be calculated as follows:C = 1 +(Fa IFc*

    2cin which

    F,*K,, = 0.3 for visually graded lumber and MELK,,c = 0.8 for sawn lumberc = 0.85 for round timber pilesc = 0.9 for glued laminated timberWhen a compression member is supported throughout its length to prevent lateral displacement in all

    = tabulated com ression design value m ultiplied by all a pplicable adjustment factors except C,F,, = KcE EI(P,/d) f= 0.418 for products with COVE5 0.11 see NDS Appendix F.2)

    directions, C, = 1.0.Lim itation on P,ld Ratio

    The slen derness ratio for solid columns, PJd, shall not exceed 50, excep t that durin g con struc tion P,/d shallnot exceed 75.Column Fixity

    The effective column length, e for a solid column shallbe determined in accordance with good engineering

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    204W O O D C O L U M N S

    Tapered Round Columns

    For design of a column with rectangular cross section, tapered at one or both ends, the representativedimension, d, for each face of the column shall be derived as follows:d=d,+(d,-d a-0.1 1 - - :

    in whichd =d m x

    the minimum dimension for that face of the columnthe maximum dimension for that face of the columnSUDW~ ~onditionsLarge end fixed , sma ll end unsupported or simply supported a =0.70

    Small end fixed, large end unsupported or simply supported a = 0.30Both ends simply supported:Tapered toward one endTapered toward both ends a = 0.50a = 0.70For all other support conditions:

    d=d +(d- -d ( 113)

    Calcula tions of f, and C, sha ll be based on the representative dimension, d. In addition, f, at any crosssection in the tapered column shall not exceed the tabulated compression design value parallel to grain multiplied

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    205

    WOOD COLUMNS

    Spaced ColumnsSpaced columns are formed of two or more individual solid members with their longitudinal axes parallel,separated at the ends and at one or more intermediate points of their length by blocking and joined at the endsby split ring or shear plate connectors capable of developing the required shear resistance. s a result of theend fixity developed by the split ring or shear plate connectors and spacer blocks, the maximum unit stress, Fc',for members of spaced colum ns may be greater than that allowed for simple solid columns having the same 9Jdratio. A greater PJd ratio may also be accepted for the mem bers of spaced columns. The design load for a

    spaced column shall be the sum of the design loads for each of its individual members.Spaced columns are classified as to degree of end fixity; i.e., end condition "a" or end condition "b". Themagnitude of the spaced column fixity factor, K,, is determined by the end condition. This is illustrated inFigure 14.

    Condition "a": end distance P1/20;K,=2.5P I and t = distance between points of lateralsupport in planes 1 and 2, measured from centerto center of lateral supports for continuousspaced columns, and measured from end to endfor simple spaced columns, inches.

    P , = distance from center of spacer block tocentroid of the group of split ring or shear plateconnectors in end blocks, inches.

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    207W O O D C O L U M N S

    2.5 for fixity condition a3.0 for fixity condition b 0.8 for sawn lumber

    KxKxC 0.9 for glued laminated timberWhen individual members of a spaced column are of different species, grades, or thicknesses, the lesserallowable compression parallel to grain design value, Fc, fo r the weaker member shall apply to both members.The allowable compression parallel to grain design value, Fc, for a spaced column shall not exceed the

    allowable com pression parallel to grain design value, Fc , for the individual mem bers evaluated as solid columnswitbout regard to fixity in accordance with page 203using the column slende rness ratio P,/d, (see Figure 14).Combined Axial a n d Bending Loading

    The equ ations on page 34 for combined flexu re and axial loading apply to spaced columns only for un iaxialbending in a direction parallel to the wide face of the individual member (dimension d2 in Figure 14). Suchmembers are in equilibrium when:

    in whichK,E E (fei/di)2fc

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    WOO0 COLUMNS

    So lut i on of Hank inson Formula

    The compress ive s t r eng th o f wood depends on the d i r ec t ion o f the app l i ed load . I t ishighest parallel to th e grain a nd lowest perpendicular to grain. Th e variation in stren gth at anglesbetween paral le l and perpendicular is determine d by the Hank inson formula which is as fol lows:

    Fg FclFn =Fgsin*O + Fc, cos20

    Fg = design value for end grain in bearing parallel to the grain, psi.= design value in compression perpendicular to the grain, psi .C le = Angle betwe en th e di rect ion of grain and direction of loadn o r m a l to the face considered.direction of grain.

    F

    F = design value in compression at inclination 8 with the

    The Hank inson fo rmula is fo r the cond i t ion where the loaded su r f ace is perpendicular tot he d i r ec t ion of the load. Where the resultant force is at an angle o t h e r t h a n 9 0 i th thesur f ace under cons t ruc t ion , t he ang le 8 is the angle between the di rect ion of grain and thedirect ion of t he fo rce compon en t which is perpendicular to the surface.Th e fol lowing table l i sts Sin2 @ and Cos2 8 for various angles of 8 :

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    W O O D COLUMNS

    E12

    I I

    10n9

    8

    7\C 96

    5

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    WOOD C O L U M N S

    WOOD COLUMNSUse of Tabular Column Data

    Th e tabular data included herein for unit axial stresses provides a simplified and accurate method for calculatingdesign loads on columns of any size and length. The load is determined by multiplying the appropriate tabular unitstress by the cross-sectional area of the member, based on net dimensions. Where the degree of refinement soindicates, the weight o f the column shou ld he deducted to determ ine the design load which may be app lied.Unit axial stresses are provided for simple solid columns, spaced columns with end condition a and spacedcolumns with end condition "h".

    Ratio of PidTh e Bid ratio is calculated in the manner previously described in the text on wood co lumn s. Values of F,' for @ratios intermediate to those given may be determined by straight line interpolation. For example, a simple, solid

    column having an F, of 1,200 psi and E of 1,600,000 psi, the F,' for an @id f 28 is 529 psi and the F,' for an P/dof 29 is 500 psi. For an Bid of 28.4, the F,' is 500 + 0.6 529-500 ) = 517.4 psi.Design Values of E and F.

    Modulus of elasticity, E, and compression parallel to grain, F-, design values for the species and grade of wood tobe used may be obtained from the National Design Specification for Wood Construction. If appropriate, E and F,should be adjusted as previously described for the conditions under which the column will be used.Tabular values of F,' are provided for a range of E values from 2,100,000 to 900,000 psi, for F, values between

    200 and 3,600 psi as appropriate for each E. Values of F,' for F, values intermediate to those tabulated may bedetermined by straight line interpolation. For example, for an @idof 25 and E of 1,400,000 psi, the F,' for an F. of

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    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    211

    E Fc* 2 4 6 8 10 11 1 2 13 14 1 5 1 6 1 7 1 8 19 20 2 1 22 23 24 25 26 27 2 8 29 30

    4 00 0 3 97 9 3 91 4 3 79 0 3 58 8 3 28 5 3 09 4 2 88 4 2 66 5 2 44 5 2 23 4 2 03 8 1 85 8 1 69 5 1 54 9 1 41 9 1 30 3 1 19 9 1 10 6 1 02 3 9 49 8 82 8 22 7 67 7 18 6 73

    3 80 0 3 78 1 3 72 2 3 61 2 3 43 2 3 16 2 2 99 2 2 80 2 2 60 0 2 39 6 2 19 7 2 01 0 1 83 6 1 67 9 1 53 7 1 40 9 1 29 5 1 19 3 1 10 1 1 01 9 9 45 8 79 8 19 7 65 7 16 6 71

    3 60 0 3 58 3 3 53 0 3 43 2 3 27 4 3 03 5 2 88 4 2 71 4 2 53 0 2 34 2 2 15 6 1 97 8 1 81 2 1 66 0 1 52 2 1 39 8 1 28 6 1 18 5 1 09 5 1 01 4 9 41 8 76 8 16 7 63 7 14 6 69

    3 40 0 3 38 5 3 33 8 3 25 2 3 11 2 2 90 4 2 77 0 2 61 9 2 45 4 2 28 2 2 11 0 1 94 3 1 78 5 1 63 9 1 50 6 1 38 5 1 27 5 1 17 7 1 08 8 1 00 9 9 37 8 72 8 13 7 60 7 11 6 67

    3 20 0 3 18 7 3 14 5 3 06 9 2 94 8 2 76 7 2 65 0 2 51 8 2 37 1 2 21 6 2 05 8 1 90 3 1 75 4 1 61 5 1 48 7 1 37 0 1 26 4 1 16 8 1 08 1 1 00 2 9 32 8 67 8 09 7 57 7 09 6 65

    3 00 0 2 98 8 2 95 2 2 88 6 2 78 1 2 62 5 2 52 5 2 40 9 2 28 1 2 14 3 2 00 0 1 85 7 1 71 9 1 58 8 1 46 5 1 35 3 1 25 0 1 15 7 1 07 2 9 95 9 25 8 62 8 05 7 53 7 06 6 62

    2 80 0 2 79 0 2 75 8 2 70 1 2 61 1 2 47 9 2 39 3 2 29 4 2 18 3 2 06 2 1 93 5 1 80 5 1 67 8 1 55 6 1 44 0 1 33 3 1 23 4 1 14 4 1 06 1 9 86 9 18 8 56 8 00 7 49 7 02 6 59

    2 10 00 00 2 60 0 2 59 1 2 56 4 2 51 6 2 43 9 2 32 7 2 25 5 2 17 2 2 07 7 1 97 3 1 86 2 1 74 6 1 63 1 1 51 8 1 41 1 1 30 9 1 21 5 1 12 9 1 04 9 9 76 9 10 8 50 7 94 7 44 6 98 6 56

    2 40 0 2 39 3 2 37 0 2 32 9 2 26 5 2 17 2 2 11 2 2 04 2 1 96 3 1 87 5 1 77 9 1 67 9 1 57 6 1 47 5 1 37 6 1 28 1 1 19 3 1 11 0 1 03 4 9 64 9 00 8 41 7 87 7 38 6 93 6 51

    2 20 0 2 19 4 2 17 5 2 14 0 2 08 8 2 01 1 1 96 3 1 90 6 1 84 1 1 76 8 1 68 8 1 60 2 1 51 3 1 42 3 1 33 4 1 24 8 1 16 6 1 08 8 1 01 6 9 50 8 88 8 31 7 79 7 31 6 87 6 46

    2 00 0 1 99 5 19 79 1 9 51 1 9 08 1 84 7 18 08 1 76 2 1 71 0 16 51 1 58 6 1 51 5 1 44 0 13 62 1 28 4 12 07 1 1 33 1 06 2 9 94 9 31 8 73 8 19 7 68 7 22 6 79 6 40

    1 80 0 1 79 6 17 83 1 7 61 1 7 27 1 67 8 16 47 1 61 2 1 57 1 15 25 1 47 3 1 41 6 1 35 5 12 91 1 22 4 11 58 1 0 92 1 02 8 9 67 9 09 8 54 8 03 7 55 7 11 6 70 6 32

    1 60 0 1 59 7 15 87 1 56 9 15 43 1 50 5 14 82 1 45 5 14 24 1 38 9 13 49 1 30 5 12 57 1 20 6 11 52 1 09 7 10 41 9 86 9 31 8 79 8 29 7 82 7 38 6 96 6 57 6 21

    1 40 0 1 39 7 13 90 1 37 6 13 57 1 32 9 13 12 1 29 2 12 69 1 24 3 12 14 1 18 2 11 46 1 10 7 10 66 1 02 2 97 7 9 31 8 86 8 41 7 97 7 55 7 15 6 77 6 41 6 07

    1 20 0 1 19 8 1 19 3 1 18 3 1 16 9 1 14 9 1 13 7 1 12 3 1 10 7 1 08 9 1 06 8 1 04 6 1 02 0 9 93 9 63 9 31 8 97 8 62 8 26 7 90 7 54 7 18 6 83 6 50 6 18 5 87

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 2 to 30

    3 60 0 3 58 2 3 52 7 3 42 3 3 25 4 3 00 0 2 83 9 2 66 0 2 47 0 2 27 7 2 08 9 1 91 1 1 74 7 1 59 7 1 46 2 1 34 1 1 23 2 1 13 5 1 04 8 9 70 9 00 8 37 7 80 7 28 6 82 6 39

    3 40 0 3 38 4 3 33 5 3 24 3 3 09 5 2 87 2 2 73 1 2 57 1 2 39 9 2 22 2 2 04 7 1 87 9 1 72 2 1 57 8 1 44 7 1 32 9 1 22 3 1 12 8 1 04 2 9 65 8 96 8 33 7 77 7 26 6 79 6 37

    3 20 0 3 18 6 3 14 3 3 06 2 2 93 3 2 74 0 2 61 6 2 47 5 2 32 2 2 16 1 2 00 0 1 84 3 1 69 5 1 55 7 1 43 1 1 31 6 1 21 3 1 11 9 1 03 5 9 59 8 91 8 30 7 74 7 23 6 77 6 35

    3 00 0 2 98 8 2 95 0 2 88 0 2 76 8 2 60 2 2 49 5 2 37 3 2 23 7 2 09 4 1 94 7 1 80 2 1 66 3 1 53 2 1 41 1 1 30 1 1 20 0 1 10 9 1 02 7 9 53 8 86 8 25 7 70 7 20 6 74 6 33

    2 80 0 2 78 9 2 75 6 2 69 6 2 60 0 2 45 9 2 36 7 2 26 2 2 14 5 2 01 9 1 88 7 1 75 5 1 62 6 1 50 3 1 38 9 1 28 3 1 18 6 1 09 8 1 01 8 9 45 8 79 8 20 7 65 7 16 6 71 6 30

    2 00 00 00 2 60 0 2 59 1 2 56 2 2 51 1 2 43 0 2 31 1 2 23 4 2 14 5 2 04 5 1 93 5 1 81 9 1 70 1 1 58 3 1 47 0 1 36 2 1 26 2 1 16 9 1 08 4 1 00 7 9 36 8 72 8 13 7 60 7 12 6 67 6 27

    2 40 0 2 39 2 23 68 2 3 25 2 2 57 2 15 8 20 94 2 02 0 1 93 6 18 43 1 74 3 1 63 9 1 53 3 14 30 1 33 1 12 37 1 1 49 1 06 8 9 94 9 25 8 63 8 06 7 54 7 06 6 63 6 23

    2 20 0 2 19 3 21 73 2 1 37 2 0 81 2 00 0 19 48 1 88 7 1 81 8 17 41 1 65 7 1 56 7 1 47 5 13 83 1 29 3 12 07 1 1 25 1 04 9 9 78 9 12 8 52 7 97 7 46 7 00 6 57 6 18

    2 00 0 1 99 5 19 78 1 9 48 1 9 03 1 83 8 17 96 1 74 8 1 69 2 16 29 1 56 0 1 48 6 1 40 7 13 28 1 24 8 11 70 1 0 95 1 02 4 9 58 8 96 8 39 7 86 7 37 6 92 6 51 6 13

    1 80 0 1 79 6 17 82 1 75 9 17 22 1 67 1 16 38 1 60 0 15 57 1 50 7 14 52 1 39 2 13 28 1 26 1 11 93 1 12 5 10 58 9 94 9 33 8 76 8 22 7 72 7 25 6 82 6 42 6 05

    1 60 0 1 59 7 15 86 1 56 7 15 40 1 50 0 14 75 1 44 6 14 13 1 37 6 13 33 1 28 7 12 36 1 18 2 11 26 1 06 9 10 12 9 56 9 02 8 49 8 00 7 53 7 10 6 69 6 31 5 96

    1 40 0 1 39 7 13 89 1 37 5 13 54 1 32 5 13 07 1 28 5 12 61 1 23 4 12 02 1 16 8 11 30 1 08 9 10 45 1 00 0 95 3 9 07 8 60 8 15 7 71 7 29 6 89 6 52 6 16 5 83

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    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    212

    3 40 0 3 38 3 33 27 3 2 24 3 05 4 27 98 2 6 38 2 4 61 2 27 5 20 89 1 91 0 1 74 3 15 89 1 45 1 1 32 6 1 21 5 11 16 1 02 7 9 48 8 77 8 13 7 56 7 04 6 57 6 15 5 76

    3 20 0 3 18 5 31 36 3 0 45 2 89 7 26 75 2 5 34 2 3 77 2 21 0 20 39 1 87 2 1 71 4 15 67 1 43 4 1 31 3 1 20 5 11 07 1 02 0 9 42 8 72 8 09 7 53 7 01 6 55 6 13 5 75

    3 00 0 2 98 6 29 44 2 8 65 2 73 7 25 46 2 4 24 2 2 86 2 13 7 19 83 1 82 9 1 68 1 15 42 1 41 4 1 29 8 1 19 3 10 98 1 01 3 9 36 8 67 8 05 7 49 6 98 6 53 6 11 5 73

    2 80 0 2 78 8 27 51 2 6 83 2 57 4 24 11 2 3 07 2 1 88 2 05 7 19 19 1 77 9 1 64 3 15 13 1 39 2 1 28 0 1 17 9 10 87 1 00 4 9 29 8 61 8 00 7 45 6 95 6 50 6 08 5 71

    2 60 0 2 59 0 25 58 2 50 0 24 08 2 27 1 21 82 2 08 1 19 68 1 84 8 17 23 1 59 9 14 79 1 36 5 12 59 1 16 2 10 74 9 93 9 20 8 54 7 94 7 40 6 91 6 46 6 05 5 68

    2 40 0 2 39 1 23 64 2 31 5 22 38 2 12 4 20 51 1 96 6 18 71 1 76 7 16 58 1 54 8 14 38 1 33 3 12 34 1 14 2 10 58 9 80 9 10 8 46 7 87 7 34 6 86 6 42 6 02 5 65

    2 20 0 2 19 3 21 70 2 13 0 20 66 1 97 3 19 13 1 84 3 17 65 1 67 8 15 84 1 48 8 13 91 1 29 6 12 04 1 11 9 10 39 9 65 8 97 8 35 7 79 7 27 6 80 6 37 5 98 5 62

    1 80 00 00 2 00 0 1 99 4 19 75 1 9 42 1 89 1 18 16 1 7 68 1 7 12 1 64 9 15 77 1 50 0 1 41 8 13 34 1 25 0 1 16 8 1 08 9 10 15 9 4 6 8 82 8 23 7 68 7 18 6 73 6 31 5 92 5 571 80 0 1 79 5 17 80 1 75 4 17 13 1 65 4 16 16 1 57 3 15 23 1 46 6 14 04 1 33 7 12 67 1 19 5 11 23 1 05 3 98 6 9 22 8 62 8 07 7 55 7 07 6 63 6 23 5 86 5 51

    1 60 0 1 59 6 15 84 1 56 4 15 32 1 48 7 14 58 1 42 5 13 87 1 34 4 12 96 1 24 3 11 87 1 12 8 10 68 1 00 7 94 8 8 91 8 37 7 86 7 38 6 93 6 51 6 13 5 77 5 44

    1 40 0 1 39 7 13 88 1 37 2 13 49 13 15 1 29 4 12 70 12 42 1 21 0 1 17 5 11 35 1 09 2 1 04 7 99 9 9 50 9 00 8 51 8 04 7 58 7 15 6 74 6 35 5 99 5 65 5 34

    1 20 0 1 19 8 11 91 1 18 0 1 16 3 11 39 11 24 1 10 7 10 88 10 66 104 1 10 13 98 2 9 49 9 13 8 76 8 38 7 98 7 59 7 21 6 83 6 47 6 13 5 80 5 49 5 20

    1000 999 994 986 975 959 949 937 925 910 894 876 856 833 809 783 756 727 698 668 638 609 580 552 526 500

    800 799 796 791 784 774 768 761 753 745 735 724 712 699 685 669 652 634 614 594 574 552 531 510 489 468

    E Fc* 2 4 6 8 10 11 12 13 14 1 5 16 1 7 1 8 19 2 0 2 1 22 23 2 4 25 26 27 28 29 30

    3 60 0 3 58 2 3 52 3 3 41 2 3 23 2 2 96 0 2 79 0 2 60 2 2 40 5 2 20 8 2 01 8 1 84 1 1 67 9 1 53 2 1 40 1 1 28 3 1 17 8 1 08 4 1 00 0 9 26 8 58 7 98 7 43 6 94 6 49 6 09

    3 40 0 3 38 4 33 31 3 2 34 3 07 6 28 37 2 6 87 2 5 19 2 34 0 21 58 1 98 1 1 81 3 16 57 1 51 6 1 38 8 1 27 3 11 70 1 07 8 9 95 9 21 8 55 7 95 7 41 6 92 6 47 6 07

    3 20 0 3 18 5 31 39 3 0 54 2 91 6 27 09 2 5 77 2 4 29 2 26 8 21 03 1 93 8 1 78 0 16 32 1 49 6 1 37 3 1 26 1 11 60 1 07 0 9 89 9 16 8 50 7 91 7 38 6 89 6 45 6 05

    3 00 0 2 98 7 29 47 2 8 73 2 75 4 25 75 2 4 61 2 3 32 2 19 0 20 40 1 89 0 1 74 3 16 04 1 47 4 1 35 5 1 24 7 11 50 1 06 1 9 82 9 10 8 46 7 87 7 34 6 86 6 43 6 03

    2 80 0 2 78 9 27 54 2 6 90 2 58 8 24 36 2 3 39 2 2 27 2 10 3 19 71 1 83 5 1 70 1 15 71 1 44 9 1 33 5 1 23 2 11 37 1 05 1 9 74 9 03 8 40 7 82 7 30 6 83 6 40 6 01

    2 60 0 2 59 0 25 60 2 5 06 2 42 0 22 92 2 2 10 2 1 15 2 00 9 18 93 1 77 3 1 65 1 15 32 1 41 9 1 31 2 1 21 3 11 22 1 03 9 9 64 8 95 8 33 7 77 7 26 6 79 6 36 5 98

    2 40 0 2 39 2 23 66 2 3 20 2 24 8 21 42 2 0 74 1 9 95 1 90 5 18 07 1 70 2 1 59 5 14 87 1 38 3 1 28 4 1 19 1 11 04 1 02 5 9 52 8 86 8 25 7 70 7 20 6 74 6 32 5 94

    1 90 00 00 2 20 0 2 19 3 2 17 2 2 13 4 2 07 4 1 98 7 1 93 2 1 86 7 1 79 3 1 71 1 1 62 2 1 52 9 1 43 5 1 34 1 1 25 0 1 16 4 1 08 3 1 00 7 9 38 8 74 8 16 7 62 7 13 6 69 6 28 5 90

    2 00 0 1 99 4 19 77 1 94 5 18 97 1 82 8 17 83 1 73 1 16 72 1 60 5 15 32 1 45 3 13 72 1 29 0 12 09 1 13 1 10 56 9 86 9 21 8 60 8 04 7 52 7 05 6 62 6 22 5 85

    1 80 0 1 79 5 17 81 1 75 6 17 18 1 66 3 16 28 1 58 7 15 41 1 48 8 14 30 1 36 6 12 99 1 22 9 11 59 1 09 0 10 23 9 59 8 98 8 42 7 89 7 40 6 95 6 53 6 14 5 79

    1 60 0 1 59 6 15 85 1 56 6 15 36 1 49 4 14 67 1 43 6 14 01 1 36 1 13 16 1 26 6 12 13 1 15 6 10 98 1 03 9 98 1 9 25 8 70 8 18 7 69 7 24 6 81 6 41 6 04 5 70

    1 40 0 1 39 7 13 89 1 37 4 13 52 1 32 0 13 01 1 27 8 12 52 1 22 3 11 89 1 15 3 11 12 1 06 9 10 23 9 76 9 28 8 80 8 33 7 87 7 44 7 02 6 63 6 26 5 91 5 59

    1 20 0 1 19 8 11 92 1 18 1 1 16 5 11 43 11 29 1 11 3 10 95 10 74 105 1 10 25 99 6 9 65 9 32 8 96 8 59 8 21 7 83 7 45 7 08 6 72 6 37 6 04 5 73 5 43

    1000 999 994 987 976 961 952 941 929 916 901 884 865 844 822 797 772 744 716 687 658 629 601 573 546 520

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 2 to 30

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    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    213

    3 20 0 3 18 3 31 27 3 02 3 28 50 2 59 2 24 31 2 25 6 20 75 1 89 7 17 28 1 57 2 14 30 1 30 3 11 89 1 08 8 99 8 9 18 8 46 7 83 7 25 6 74 6 28 5 86 5 48 5 14

    3 00 0 2 98 5 29 36 2 84 6 26 97 2 47 4 23 33 2 17 8 20 15 1 85 2 16 94 1 54 6 14 11 1 28 8 11 77 1 07 9 99 1 9 12 8 42 7 79 7 22 6 71 6 25 5 84 5 46 5 12

    2 80 0 2 78 7 27 45 2 66 7 25 40 2 34 9 22 29 2 09 3 19 48 1 80 0 16 55 1 51 7 13 88 1 27 0 11 64 1 06 8 98 2 9 05 8 36 7 74 7 18 6 68 6 23 5 82 5 44 5 11

    2 60 0 2 58 9 25 53 2 48 6 23 79 2 21 9 21 16 2 00 0 18 74 1 74 2 16 10 1 48 2 13 62 1 25 0 11 48 1 05 6 97 2 8 97 8 30 7 69 7 14 6 64 6 20 5 79 5 42 5 09

    2 40 0 2 39 0 23 60 2 30 4 22 14 2 08 1 19 96 1 89 8 17 90 1 67 5 15 57 1 44 1 13 30 1 22 6 11 29 1 04 1 96 0 8 88 8 22 7 62 7 09 6 60 6 16 5 76 5 39 5 06

    2 20 0 2 19 2 21 66 2 12 0 20 46 1 93 8 18 68 1 78 7 16 97 1 59 9 14 97 1 39 3 12 93 1 19 6 11 06 1 02 2 94 6 8 76 8 12 7 55 7 02 6 55 6 11 5 72 5 36 5 03

    2 00 0 1 99 3 19 72 1 93 4 18 75 1 78 8 17 32 1 66 7 15 93 1 51 2 14 26 1 33 7 12 47 1 16 1 10 78 1 00 0 92 8 8 61 8 01 7 45 6 94 6 48 6 06 5 67 5 32 5 00

    1 60 00 00 1 80 0 1 79 5 17 78 1 74 7 17 00 1 63 2 15 88 1 53 7 14 79 1 41 4 13 43 1 26 9 11 93 1 11 7 10 43 9 72 9 05 8 43 7 86 7 33 6 84 6 40 5 99 5 61 5 27 4 96

    1 60 0 1 59 6 15 82 1 55 9 15 22 14 70 1 43 7 1 39 8 13 54 1 30 3 1 24 8 11 88 1 12 6 1 06 2 99 8 9 36 8 76 8 20 7 66 7 17 6 71 6 29 5 90 5 54 5 21 4 90

    1 40 0 1 39 7 1 38 7 1 36 9 1 34 2 1 30 3 1 27 8 1 25 0 1 21 7 1 18 0 1 13 9 1 09 4 1 04 5 9 94 9 42 8 90 8 38 7 88 7 41 6 96 6 54 6 14 5 77 5 43 5 12 4 83

    1 20 0 1 19 8 11 90 11 77 115 8 11 30 11 13 109 3 10 70 10 45 101 5 9 83 9 48 9 10 8 70 8 29 7 88 7 46 7 06 6 67 6 29 5 94 5 60 5 29 5 00 4 72

    1000 998 993 984 971 953 941 928 913 896 877 856 833 807 779 750 719 688 656 625 594 564 535 508 481 457

    800 799 796 790 782 771 764 756 747 737 725 713 699 683 666 648 628 608 586 564 541 519 496 474 453 432

    600 599 598 594 590 584 580 576 571 566 560 554 546 538 530 520 510 499 487 475 461 447 433 419 404 389

    E Fc* 2 4 6 8 10 11 1 2 13 14 1 5 1 6 1 7 1 8 19 20 2 1 22 23 24 25 26 27 2 8 29 30

    3 20 0 3 18 4 31 32 3 03 5 28 75 2 63 6 24 86 2 32 0 21 45 1 97 0 18 02 1 64 4 15 00 1 36 9 12 52 1 14 7 10 53 9 69 8 95 8 28 7 68 7 13 6 65 6 21 5 81 5 44

    3 00 0 2 98 6 29 40 2 85 6 27 18 2 51 2 23 81 2 23 5 20 79 1 92 0 17 64 1 61 5 14 78 1 35 2 12 39 1 13 6 10 45 9 63 8 89 8 23 7 64 7 10 6 62 6 18 5 79 5 43

    2 80 0 2 78 8 27 48 2 67 5 25 58 2 38 2 22 70 2 14 3 20 05 1 86 2 17 19 1 58 2 14 52 1 33 2 12 23 1 12 4 10 35 9 55 8 83 8 18 7 59 7 07 6 59 6 16 5 77 5 41

    2 60 0 2 58 9 25 55 2 49 3 23 94 2 24 6 21 51 2 04 3 19 24 1 79 7 16 69 1 54 2 14 22 1 30 9 12 05 1 11 0 10 24 9 46 8 75 8 12 7 54 7 02 6 55 6 13 5 74 5 39

    2 40 0 2 39 1 23 62 2 31 0 22 27 2 10 4 20 25 1 93 4 18 33 1 72 4 16 10 1 49 6 13 86 1 28 1 11 83 1 09 2 10 10 9 35 8 66 8 04 7 48 6 97 6 51 6 09 5 71 5 36

    2 20 0 2 19 2 21 68 2 12 5 20 57 1 95 6 18 92 1 81 7 17 33 1 64 0 15 43 1 44 3 13 43 1 24 7 11 56 1 07 2 99 3 9 21 8 55 7 95 7 41 6 91 6 46 6 05 5 67 5 33

    2 00 0 1 99 4 19 74 1 93 9 18 83 1 80 3 17 51 1 69 1 16 23 1 54 7 14 65 1 37 9 12 92 1 20 7 11 24 1 04 6 97 2 9 04 8 42 7 84 7 32 6 83 6 39 5 99 5 62 5 29

    1 70 00 00 1 80 0 1 79 5 17 79 1 75 1 17 07 1 64 4 16 03 1 55 6 15 02 1 44 2 13 75 1 30 5 12 31 1 15 7 10 84 1 01 4 94 7 8 83 8 25 7 70 7 20 6 74 6 31 5 92 5 57 5 24

    1 60 0 1 59 6 15 83 1 56 1 15 28 1 47 9 14 48 1 41 3 13 71 1 32 5 12 73 1 21 7 11 58 1 09 6 10 34 9 73 9 13 8 56 8 03 7 52 7 05 6 61 6 21 5 84 5 49 5 17

    1 40 0 1 39 7 13 87 1 37 1 13 45 13 10 1 28 7 1 26 1 12 31 1 19 6 1 15 8 11 16 1 07 0 1 02 2 97 2 9 21 8 70 8 21 7 73 7 28 6 85 6 44 6 07 5 72 5 39 5 09

    1 20 0 1 19 8 11 91 11 79 116 0 11 35 11 19 110 1 10 80 10 56 102 9 9 99 9 66 9 31 8 93 8 54 8 14 7 73 7 33 6 95 6 57 6 21 5 87 5 55 5 25 4 97

    1000 998 994 985 973 956 945 933 919 904 886 867 845 821 795 768 739 709 678 648 617 587 558 531 504 479

    800 799 796 791 783 772 766 759 750 741 731 719 706 692 676 659 641 621 601 580 558 536 514 493 471 451

    600 599 598 595 591 585 581 577 573 568 563 557 550 543 535 526 517 506 495 484 471 458 445 431 417 403

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 2 to 30

  • 8/13/2019 Timber Column2fg

    15/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    214

    2 80 0 2 78 5 27 36 2 64 5 24 94 2 26 8 21 27 1 97 4 18 16 1 66 0 15 12 1 37 5 12 51 1 14 0 10 40 9 52 8 73 8 03 7 41 6 85 6 35 5 90 5 49 5 13 4 80 4 49

    2 60 0 2 58 7 25 45 2 46 8 23 41 2 14 9 20 29 1 89 6 17 55 1 61 4 14 78 1 34 9 12 32 1 12 5 10 29 9 43 8 66 7 97 7 36 6 81 6 31 5 87 5 47 5 11 4 78 4 48

    2 40 0 2 38 9 23 54 2 28 8 21 82 2 02 4 19 23 1 80 9 16 87 1 56 1 14 37 1 31 9 12 08 1 10 7 10 15 9 32 8 57 7 90 7 30 6 76 6 28 5 84 5 44 5 08 4 76 4 46

    2 20 0 2 19 1 21 61 2 10 7 20 20 18 90 1 80 7 17 13 16 09 1 50 0 1 39 0 12 82 1 18 0 1 08 5 99 8 9 18 8 46 7 82 7 23 6 70 6 23 5 80 5 41 5 06 4 73 4 44

    2 00 0 1 99 2 19 68 1 92 4 18 54 17 50 1 68 3 16 06 15 21 1 42 9 1 33 3 12 38 1 14 6 1 05 8 97 7 9 02 8 33 7 71 7 15 6 63 6 17 5 75 5 37 5 02 4 70 4 42

    1 80 0 1 79 4 17 74 1 73 9 16 84 16 02 1 55 0 14 89 14 21 1 34 6 1 26 6 11 85 1 10 4 1 02 5 95 1 8 81 8 17 7 58 7 04 6 54 6 10 5 69 5 32 4 98 4 67 4 38

    1 40 00 00 1 60 0 1 59 5 15 80 1 55 2 15 10 14 48 1 40 8 13 62 13 09 1 25 0 1 18 6 11 19 1 05 1 9 83 9 17 8 54 7 95 7 40 6 90 6 43 6 00 5 61 5 25 4 92 4 62 4 34

    1 40 0 1 39 6 13 85 1 36 4 1 33 2 12 86 12 57 1 22 3 11 84 11 40 109 2 10 40 98 5 9 29 8 74 8 19 7 67 7 17 6 71 6 27 5 87 5 50 5 16 4 84 4 55 4 291 20 0 1 19 7 11 89 117 4 1 15 1 11 19 10 98 107 5 10 47 10 17 98 2 9 44 9 03 8 60 8 16 7 72 7 28 6 85 6 44 6 06 5 69 5 35 5 03 4 74 4 46 4 21

    1000 998 992 982 967 945 932 916 898 878 855 830 802 772 741 708 674 640 607 574 543 513 485 458 433 410

    800 799 795 789 779 766 758 748 738 726 712 697 680 662 642 621 598 575 551 526 502 479 456 433 412 392

    600 599 597 594 588 581 577 572 567 560 553 546 537 528 517 506 494 481 467 452 437 422 406 390 375 359

    400 400 399 397 395 392 390 388 386 383 381 377 374 370 366 362 357 352 346 340 334 327 320 312 305 297

    E Fc* 2 4 6 8 10 11 12 13 14 1 5 16 1 7 1 8 19 2 0 2 1 22 23 2 4 25 26 27 28 29 30

    3 00 0 2 98 4 29 32 2 83 4 26 72 2 43 0 22 79 2 11 5 19 45 1 77 8 16 20 1 47 3 13 41 1 22 1 11 15 1 02 0 93 6 8 61 7 94 7 34 6 80 6 32 5 89 5 49 5 14 4 82

    2 80 0 2 78 6 27 41 2 65 7 25 19 2 31 2 21 81 2 03 7 18 85 1 73 3 15 86 1 44 8 13 21 1 20 6 11 03 1 01 1 92 8 8 55 7 89 7 30 6 77 6 29 5 86 5 47 5 12 4 80

    2 60 0 2 58 8 25 49 2 47 8 23 61 2 18 7 20 76 1 95 1 18 18 1 68 1 15 46 1 41 8 12 98 1 18 9 10 89 1 00 0 92 0 8 48 7 83 7 25 6 73 6 26 5 84 5 45 5 10 4 78

    2 40 0 2 39 0 23 57 2 29 7 22 00 2 05 5 19 62 1 85 7 17 42 1 62 1 15 00 1 38 2 12 71 1 16 8 10 73 9 87 9 09 8 39 7 76 7 20 6 68 6 22 5 80 5 42 5 08 4 76

    2 20 0 2 19 1 21 64 2 11 4 20 34 1 91 6 18 40 1 75 2 16 56 1 55 2 14 46 1 34 0 12 38 1 14 2 10 53 9 71 8 97 8 29 7 68 7 13 6 63 6 17 5 76 5 39 5 05 4 74

    2 00 0 1 99 3 19 70 1 93 0 18 65 1 77 0 17 09 1 63 9 15 59 1 47 3 13 82 1 29 0 11 99 1 11 1 10 29 9 52 8 81 8 17 7 58 7 05 6 56 6 12 5 72 5 35 5 02 4 71

    1 80 0 1 79 4 17 76 1 74 3 16 93 16 18 1 57 0 15 15 14 52 1 38 2 1 30 7 12 29 1 15 0 1 07 3 99 8 9 28 8 62 8 01 7 45 6 94 6 47 6 05 5 65 5 30 4 97 4 67

    1 50 00 00 1 60 0 1 59 5 15 81 1 55 6 15 17 1 46 0 14 23 1 38 1 13 33 1 27 9 12 19 1 15 6 10 90 1 02 4 95 9 8 97 8 37 7 81 7 29 6 81 6 36 5 95 5 58 5 23 4 91 4 62

    1 40 0 1 39 6 1 38 6 1 36 6 1 33 7 1 29 5 1 26 9 1 23 8 1 20 2 1 16 2 1 11 7 1 06 9 1 01 7 9 64 9 09 8 56 8 04 7 54 7 07 6 62 6 21 5 83 5 47 5 14 4 84 4 56

    1 20 0 1 19 7 11 89 117 6 1 15 5 11 25 11 06 108 5 10 60 10 32 100 0 9 65 9 27 8 87 8 45 8 02 7 59 7 17 6 76 6 37 6 00 5 65 5 32 5 02 4 73 4 47

    1000 998 993 983 969 949 937 923 906 888 867 844 819 791 761 730 698 665 633 601 569 539 511 483 458 434

    800 799 795 789 781 768 761 752 743 732 719 705 690 673 655 635 614 592 569 546 523 500 477 454 433 412

    600 599 597 594 589 583 579 574 569 563 557 550 542 533 524 514 502 490 478 464 450 435 420 405 390 375

    400 400 399 397 395 392 391 389 387 385 382 379 376 373 369 365 361 356 351 345 339 333 327 320 312 305

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 2 to 30

  • 8/13/2019 Timber Column2fg

    16/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    215

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 2 to 30

    E Fc* 2 4 6 8 10 11 1 2 13 14 1 5 1 6 1 7 1 8 19 20 2 1 22 23 24 25 26 27 2 8 29 30

    2 80 0 2 78 4 27 31 2 63 1 24 65 22 16 2 06 4 1 90 2 17 38 1 58 0 1 43 3 12 99 1 17 8 1 07 1 97 6 8 92 8 17 7 51 6 92 6 39 5 92 5 50 5 12 4 78 4 47 4 19

    2 60 0 2 58 6 25 41 2 45 6 23 16 21 06 1 97 5 1 83 3 16 86 1 54 1 1 40 4 12 77 1 16 2 1 05 8 96 6 8 84 8 11 7 46 6 88 6 36 5 89 5 48 5 10 4 76 4 45 4 17

    2 40 0 2 38 8 23 50 2 27 9 21 62 19 87 1 87 7 1 75 5 16 25 1 49 5 1 36 9 12 51 1 14 2 1 04 3 95 4 8 75 8 03 7 40 6 83 6 32 5 86 5 45 5 08 4 74 4 44 4 16

    2 20 0 2 19 0 21 58 2 09 9 20 04 18 61 1 76 9 1 66 7 15 56 1 44 2 1 32 8 12 20 1 11 8 1 02 5 94 0 8 63 7 95 7 33 6 77 6 27 5 82 5 42 5 05 4 72 4 42 4 14

    2 00 0 1 99 2 19 66 1 91 8 18 41 17 26 1 65 2 1 56 8 14 76 1 37 8 1 27 9 11 82 1 08 9 1 00 2 92 2 8 50 7 83 7 24 6 70 6 21 5 77 5 37 5 01 4 69 4 39 4 12

    1 80 0 1 79 3 1 77 2 1 73 4 1 67 3 1 58 4 1 52 6 1 45 9 1 38 5 1 30 4 1 22 0 1 13 5 1 05 3 9 74 9 00 8 32 7 69 7 12 6 61 6 14 5 71 5 32 4 97 4 65 4 36 4 09

    1 60 0 1 59 5 1 57 8 1 54 8 1 50 2 1 43 3 1 38 9 1 33 8 1 28 1 1 21 7 1 14 9 1 07 8 1 00 7 9 38 8 72 8 09 7 51 6 98 6 49 6 04 5 63 5 26 4 91 4 60 4 32 4 06

    1 30 00 00 1 40 0 1 39 6 1 38 3 1 36 1 1 32 6 1 27 6 1 24 4 1 20 6 11 63 11 15 10 63 10 07 94 9 8 91 8 34 7 79 7 27 6 78 6 33 5 91 5 52 5 17 4 84 4 54 4 26 4 01

    1 20 0 1 19 7 11 88 11 72 114 7 11 11 10 89 106 3 10 33 99 9 9 61 9 20 8 76 8 30 7 84 7 39 6 94 6 51 6 11 5 73 5 37 5 04 4 73 4 45 4 19 3 95

    1000 998 992 980 964 940 925 908 889 866 841 814 783 751 717 682 647 612 578 546 515 485 458 432 408 385

    800 799 795 788 777 763 754 744 732 719 704 687 669 649 627 604 580 555 530 505 480 456 433 411 390 370

    600 599 597 593 587 580 575 570 564 557 549 541 531 521 509 497 483 469 454 439 423 406 390 374 358 342

    400 400 399 397 395 391 389 387 385 382 379 375 372 368 363 358 353 347 341 335 328 320 312 304 296 287

    200 200 200 199 199 198 197 197 196 196 195 194 194 193 192 191 190 188 187 186 185 183 181 180 178 176

    2 60 0 2 58 5 2 53 6 2 44 2 2 28 7 2 05 4 1 91 2 1 76 1 1 60 8 1 46 2 1 32 5 1 20 0 1 08 9 9 90 9 02 8 24 7 55 6 93 6 39 5 90 5 47 5 08 4 73 4 41 4 13 3 87

    2 40 0 2 38 7 2 34 5 2 26 7 2 13 8 1 94 4 1 82 3 1 69 2 1 55 6 1 42 3 1 29 6 1 17 9 1 07 2 9 77 8 92 8 16 7 48 6 88 6 35 5 87 5 44 5 06 4 71 4 39 4 11 3 85

    2 20 0 2 18 9 2 15 4 2 09 0 1 98 4 1 82 5 1 72 4 1 61 3 1 49 5 1 37 7 1 26 1 1 15 3 1 05 3 9 62 8 80 8 07 7 41 6 82 6 30 5 83 5 41 5 03 4 68 4 37 4 09 3 84

    2 00 0 1 99 1 1 96 2 1 91 0 1 82 5 1 69 7 1 61 6 1 52 4 1 42 5 1 32 2 1 21 9 1 12 1 1 02 8 9 43 8 65 7 95 7 32 6 75 6 24 5 78 5 37 4 99 4 66 4 35 4 07 3 82

    1 80 0 1 79 3 17 70 17 28 1 66 1 15 61 14 97 142 4 13 42 12 56 116 8 1 08 1 9 98 9 19 8 47 7 80 7 20 6 66 6 16 5 72 5 31 4 95 4 62 4 32 4 05 3 80

    1 60 0 1 59 4 15 76 15 44 1 49 2 14 16 13 67 131 1 12 47 11 78 110 6 1 03 2 9 59 8 89 8 23 7 62 7 05 6 54 6 06 5 64 5 25 4 89 4 57 4 28 4 01 3 77

    1 20 00 00 1 40 0 1 39 6 1 38 2 1 35 7 1 31 9 1 26 3 1 22 8 1 18 6 1 13 9 1 08 6 1 02 9 9 70 9 09 8 49 7 91 7 36 6 85 6 37 5 93 5 53 5 16 4 82 4 51 4 23 3 97 3 73

    1 20 0 1 19 7 11 87 11 69 114 2 11 03 10 78 104 9 10 15 97 8 9 36 8 91 8 44 7 97 7 49 7 02 6 57 6 15 5 75 5 38 5 03 4 72 4 42 4 15 3 90 3 68

    1000 998 991 979 960 934 918 899 877 852 825 794 761 726 690 653 617 582 548 515 485 456 429 404 381 360

    800 799 794 787 775 759 750 738 725 710 694 675 655 633 609 584 558 532 506 480 456 431 409 387 366 347

    600 599 597 593 586 578 573 567 560 552 544 534 524 512 500 486 471 456 440 423 406 389 372 356 340 324

    400 400 399 397 394 390 388 386 383 380 377 373 369 364 359 354 348 342 335 328 320 312 303 295 286 276

    200 200 200 199 199 198 197 197 196 195 195 194 193 192 191 190 189 187 186 185 183 181 179 178 176 173

  • 8/13/2019 Timber Column2fg

    17/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    216

    E Fc* 2 4 6 8 10 11 12 13 14 1 5 16 1 7 1 8 19 2 0 2 1 22 23 2 4 25 26 27 28 29 30

    1 80 0 1 79 2 17 67 1 72 0 1 64 6 15 34 14 62 1 38 1 12 93 12 01 111 0 10 21 93 8 8 61 7 90 7 27 6 69 6 17 5 71 5 29 4 91 4 57 4 26 3 98 3 73 3 50

    1 60 0 1 59 4 15 74 153 8 1 48 1 13 95 13 41 127 8 12 08 11 33 105 6 9 80 9 06 8 36 7 71 7 11 6 57 6 07 5 63 5 22 4 86 4 52 4 22 3 95 3 70 3 47

    1 40 0 1 39 5 13 80 135 3 1 31 1 12 48 12 08 116 1 11 09 10 51 99 0 9 26 8 64 8 03 7 45 6 91 6 40 5 94 5 52 5 13 4 78 4 46 4 17 3 91 3 66 3 44

    1 20 0 1 19 6 11 86 116 6 1 13 6 10 92 1 064 103 1 9 94 9 52 9 07 8 58 8 08 7 58 7 09 6 62 6 17 5 76 5 37 5 01 4 68 4 38 4 10 3 85 3 61 3 40

    1000 998 990 977 956 927 909 888 863 835 805 771 735 697 659 621 584 549 515 483 453 425 400 376 354 333

    1100000

    800 798 794 785 773 755 744 731 717 700 682 661 638 614 588 561 534 507 480 454 429 405 383 361 342 323

    600 599 596 592 585 576 570 563 556 547 538 527 515 502 488 473 457 440 423 405 387 370 352 336 320 304

    400 400 398 396 393 390 387 384 381 378 374 370 366 360 355 349 342 335 328 319 311 302 293 283 274 264

    200 200 200 199 198 197 197 196 196 195 194 193 192 191 190 189 187 186 185 183 181 179 177 175 173 170

    2 00 0 1 98 9 19 55 188 9 1 78 2 16 20 15 19 141 0 12 97 11 86 108 0 9 82 8 94 8 14 7 43 6 80 6 24 5 74 5 29 4 89 4 53 4 21 3 92 3 66 3 43 3 211 80 0 1 79 1 17 63 171 2 1 62 7 15 00 14 20 133 0 12 35 11 39 104 5 9 56 8 73 7 99 7 31 6 70 6 16 5 68 5 24 4 85 4 50 4 18 3 90 3 64 3 41 3 20

    1 60 0 1 59 3 15 71 153 1 1 46 6 13 70 13 08 123 8 11 61 10 81 100 0 9 22 8 47 7 78 7 15 6 58 6 06 5 60 5 18 4 80 4 46 4 15 3 87 3 62 3 39 3 18

    1 40 0 1 39 5 13 78 134 8 1 30 0 12 29 11 84 113 1 10 73 10 09 94 3 8 77 8 13 7 52 6 94 6 41 5 93 5 49 5 09 4 73 4 40 4 10 3 83 3 58 3 36 3 15

    1 20 0 1 19 6 11 84 116 2 1 12 8 10 79 1 047 101 0 9 68 9 21 8 71 8 19 7 67 7 15 6 65 6 18 5 75 5 34 4 97 4 63 4 32 4 03 3 77 3 53 3 31 3 11

    1000000

    1000 997 989 974 952 919 898 874 846 815 780 743 704 664 624 585 548 512 479 448 419 393 369 346 325 306

    800 798 793 784 770 750 738 723 707 688 667 643 618 591 563 535 506 478 451 425 400 377 355 335 316 298

    600 599 596 591 583 573 566 559 551 541 530 518 505 490 474 457 440 421 403 384 366 348 330 314 298 283

    400 400 398 396 393 388 386 383 379 376 371 367 361 356 349 342 335 327 318 309 300 290 280 270 260 250

    200 200 200 199 198 197 197 196 195 194 193 192 191 190 189 188 186 184 183 181 179 177 174 172 169 167

    1 60 0 1 59 2 15 68 152 2 1 44 9 13 37 12 67 118 8 11 05 10 19 93 6 8 57 7 84 7 17 6 57 6 02 5 54 5 10 4 71 4 36 4 05 3 76 3 51 3 28 3 07 2 87

    1 40 0 1 39 4 13 76 134 2 1 28 7 12 06 11 53 109 4 10 28 96 0 8 90 8 21 7 56 6 96 6 40 5 89 5 43 5 02 4 64 4 31 4 00 3 72 3 47 3 25 3 04 2 85

    1200 1196 1182 1158 1119 1062 1026 983 936 884 829 774 719 667 617 571 529 490 455 423 394 367 343 321 301 283

    1000 997 988 971 945 908 884 856 824 789 750 709 667 625 584 545 508 473 441 411 384 359 336 315 296 278900000

    800 798 792 782 766 743 729 713 694 672 648 622 593 564 534 504 474 446 419 393 369 346 326 306 289 272

    600 599 596 590 581 570 562 554 544 533 520 506 491 475 457 438 419 399 380 360 342 324 306 290 275 260

    400 400 398 396 392 387 384 381 377 372 368 362 356 350 342 334 326 317 307 297 287 276 266 255 244 234

    200 200 200 199 198 197 196 195 195 194 193 192 190 189 187 186 184 182 180 178 176 173 171 168 165 162

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 2 to 30

  • 8/13/2019 Timber Column2fg

    18/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    217

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 30 to 50

    E Fc* 30 31 32 33 34 35 3 6 37 38 3 9 4 0 4 1 4 2 43 44 4 5 46 47 48 49 50

    4000 673 632 594 560 529 500 473 449 426 405 386 367 350 335 320 306 293 281 270 259 249

    3800 671 630 593 559 528 499 473 448 426 405 385 367 350 334 320 306 293 281 269 259 249

    3600 669 629 592 558 527 498 472 447 425 404 385 366 350 334 319 305 293 280 269 258 248

    3400 667 627 590 557 526 497 471 447 424 403 384 366 349 333 319 305 292 280 269 258 248

    3200 665 625 589 555 524 496 470 446 423 403 383 365 349 333 318 305 292 280 269 258 248

    3000 662 623 587 553 523 495 469 445 422 402 383 365 348 332 318 304 291 279 268 258 248

    2800 659 620 584 551 521 493 467 443 421 401 382 364 347 332 317 304 291 279 268 257 247

    2100000 2600 656 617 582 549 519 491 466 442 420 400 381 363 346 331 317 303 290 279 267 257 247

    2400 651 613 578 546 517 489 464 440 419 398 379 362 346 330 316 302 290 278 267 256 246

    2200 646 609 575 543 514 487 462 438 417 397 378 361 344 329 315 302 289 277 266 256 246

    2000 640 603 570 539 510 483 459 436 415 395 376 359 343 328 314 300 288 276 265 255 245

    1800 632 596 564 534 506 479 455 433 412 392 374 357 341 326 312 299 287 275 264 254 244

    1600 621 587 556 527 500 474 451 429 408 389 371 355 339 324 310 298 285 274 263 253 243

    1400 607 575 546 518 492 467 445 423 404 385 368 351 336 322 308 295 283 272 261 251 242

    1200 587 558 531 505 481 458 436 416 397 379 362 347 332 318 305 292 281 270 259 249 240

    3600 639 600 565 532 503 475 450 427 405 385 367 349 333 318 304 291 279 267 256 246 237

    3400 637 599 564 531 502 474 449 426 405 385 366 349 333 318 304 291 279 267 256 246 236

    3200 635 597 562 530 500 473 448 425 404 384 366 348 332 318 304 290 278 267 256 246 236

    3000 633 595 560 528 499 472 447 424 403 383 365 348 332 317 303 290 278 266 256 246 236

    2800 630 593 558 527 498 471 446 423 402 382 364 347 331 316 303 290 277 266 255 245 236

    2000000 2600 627 590 556 524 496 469 445 422 401 381 363 346 331 316 302 289 277 266 255 245 235

    2400 623 586 553 522 493 467 443 420 400 380 362 345 330 315 301 288 276 265 254 244 2352200 618 582 549 519 491 465 441 419 398 379 361 344 329 314 300 288 276 264 254 244 234

    2000 613 577 545 515 488 462 438 416 396 377 359 343 327 313 299 287 275 264 253 243 234

    1800 605 571 540 511 484 458 435 414 393 375 357 341 326 311 298 286 274 263 252 242 233

    1600 596 563 533 504 478 454 431 410 390 372 355 339 324 310 296 284 272 261 251 241 232

    1400 583 552 523 496 471 448 426 405 386 368 351 336 321 307 294 282 271 260 250 240 231

  • 8/13/2019 Timber Column2fg

    19/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    218UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 30 to 50

    E Fc* 30 31 3 2 33 34 35 36 37 38 3 9 40 4 1 4 2 43 4 4 4 5 46 47 4 8 49 50

    3600 609 572 538 507 478 452 428 406 385 366 349 332 317 303 289 277 265 254 244 234 225

    3400 607 570 537 506 477 451 428 405 385 366 348 332 317 302 289 277 265 254 244 234 225

    3200 605 569 535 505 476 451 427 405 384 365 348 331 316 302 289 276 265 254 243 234 225

    3000 603 567 534 503 475 449 426 404 383 365 347 331 316 302 288 276 264 253 243 233 224

    2800 601 565 532 502 474 448 425 403 383 364 346 330 315 301 288 275 264 253 243 233 224

    2600 598 562 530 500 472 447 423 402 382 363 346 330 314 300 287 275 263 253 242 233 224

    1900000 2400 594 559 527 497 470 445 422 400 380 362 345 329 314 300 287 274 263 252 242 232 223

    2200 590 556 524 495 468 443 420 399 379 361 344 328 313 299 286 274 262 252 241 232 223

    2000 585 551 520 491 465 440 418 397 377 359 342 326 312 298 285 273 262 251 241 231 222

    1800 579 546 515 487 461 437 415 394 375 357 340 325 310 297 284 272 261 250 240 231 222

    1600 570 538 509 482 457 433 411 391 372 355 338 323 308 295 282 270 259 249 239 230 221

    1400 559 529 501 475 450 428 407 387 368 351 335 320 306 293 280 269 258 247 238 228 220

    1200 543 515 489 465 442 420 400 381 363 347 331 316 303 290 278 266 256 245 236 227 218

    3400 576 541 509 480 453 428 406 385 365 347 330 315 300 287 274 262 251 241 231 222 213

    3200 575 540 508 479 452 428 405 384 365 347 330 314 300 286 274 262 251 241 231 222 213

    3000 573 538 507 478 451 427 404 383 364 346 329 314 299 286 273 262 251 240 231 221 213

    2800 571 536 505 476 450 426 403 382 363 345 329 313 299 286 273 261 250 240 230 221 213

    2600 568 534 503 475 448 424 402 381 362 345 328 313 298 285 273 261 250 240 230 221 212

    2400 565 532 501 473 447 423 401 380 361 344 327 312 298 284 272 260 249 239 230 220 212

    2200 562 528 498 470 445 421 399 379 360 342 326 311 297 284 271 260 249 239 229 220 212

    1800000 2000 557 525 495 467 442 419 397 377 358 341 325 310 296 283 270 259 248 238 228 219 211

    1800 551 520 491 464 439 416 395 375 356 339 323 308 295 282 269 258 247 237 228 219 2101600 544 513 485 459 435 412 391 372 354 337 321 307 293 280 268 257 246 236 227 218 210

    1400 534 505 478 453 429 407 387 368 351 334 319 304 291 278 266 255 245 235 226 217 209

    1200 520 493 468 444 421 401 381 363 346 330 315 301 288 276 264 253 243 233 224 215 207

    1000 500 476 453 431 410 391 372 355 339 324 310 296 284 272 261 250 240 231 222 213 205

    800 468 448 428 410 392 375 358 343 328 314 301 289 277 266 255 245 236 227 218 210 202

  • 8/13/2019 Timber Column2fg

    20/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    219

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 30 to 50

    E Fc* 30 31 32 33 34 35 3 6 37 38 3 9 4 0 4 1 4 2 43 44 4 5 46 47 48 49 50

    3200 544 511 481 453 428 405 383 363 345 328 312 297 284 271 259 248 237 227 218 209 201

    3000 543 510 480 452 427 404 382 363 344 327 312 297 283 270 259 247 237 227 218 209 201

    2800 541 508 478 451 426 403 381 362 344 327 311 296 283 270 258 247 237 227 218 209 201

    2600 539 506 477 450 425 402 380 361 343 326 310 296 282 270 258 247 236 227 217 209 201

    2400 536 504 475 448 423 400 379 360 342 325 310 295 282 269 257 246 236 226 217 208 200

    2200 533 501 472 446 421 399 378 359 341 324 309 294 281 268 257 246 235 226 217 208 200

    2000 529 498 469 443 419 397 376 357 339 323 308 293 280 268 256 245 235 225 216 208 200

    1700000 1800 524 493 466 440 416 394 374 355 338 321 306 292 279 267 255 244 234 224 215 207 199

    1600 517 488 461 436 413 391 371 353 335 319 304 291 277 265 254 243 233 224 215 206 198

    1400 509 480 454 430 408 387 367 349 332 317 302 288 276 264 252 242 232 222 214 205 198

    1200 497 470 445 422 401 381 362 345 328 313 299 286 273 261 250 240 230 221 212 204 196

    1000 479 455 432 411 391 372 355 338 322 308 294 281 269 258 247 237 228 219 210 202 195

    800 451 430 411 393 375 358 342 327 313 299 287 275 263 253 242 233 224 215 207 199 192

    600 403 388 374 360 346 333 320 308 296 284 273 263 252 243 234 225 217 209 201 194 187

    3200 514 482 454 428 404 382 361 342 325 309 294 280 267 255 244 233 223 214 206 197 190

    3000 512 481 453 427 403 381 361 342 325 309 294 280 267 255 244 233 223 214 205 197 189

    2800 511 480 451 426 402 380 360 341 324 308 293 279 267 255 243 233 223 214 205 197 189

    2600 509 478 450 424 401 379 359 340 323 307 293 279 266 254 243 232 223 213 205 197 189

    2400 506 476 448 423 399 378 358 339 322 307 292 278 266 254 242 232 222 213 205 196 189

    2200 503 474 446 421 398 376 357 338 321 306 291 278 265 253 242 232 222 213 204 196 188

    2000 500 471 443 419 396 375 355 337 320 305 290 277 264 252 241 231 221 212 204 196 188

    1600000 1800 496 467 440 416 393 372 353 335 319 303 289 276 263 251 241 230 221 212 203 195 1881600 490 462 436 412 390 370 351 333 317 302 287 274 262 250 240 229 220 211 202 195 187

    1400 483 456 431 407 386 366 347 330 314 299 285 272 260 249 238 228 219 210 202 194 186

    1200 472 447 423 401 380 361 343 326 311 296 283 270 258 247 236 226 217 209 200 193 185

    1000 457 433 411 391 371 353 336 320 306 292 278 266 255 244 234 224 215 207 199 191 184

    800 432 412 393 375 357 341 326 311 297 284 272 260 249 239 229 220 212 203 196 188 181

    600 389 375 360 346 333 319 306 294 282 271 260 250 240 231 222 213 205 198 191 184 177

  • 8/13/2019 Timber Column2fg

    21/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    220UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 30 to 50

    E Fc* 30 31 3 2 33 34 35 36 37 38 3 9 40 4 1 4 2 43 4 4 4 5 46 47 4 8 49 50

    3000 482 452 425 401 378 358 339 321 305 290 276 263 251 239 229 219 210 201 193 185 178

    2800 480 451 424 400 378 357 338 320 304 289 275 262 250 239 228 219 209 201 192 185 178

    2600 478 449 423 399 377 356 337 320 304 289 275 262 250 239 228 218 209 200 192 185 177

    2400 476 448 421 397 375 355 336 319 303 288 274 261 249 238 228 218 209 200 192 184 177

    2200 474 446 420 396 374 354 335 318 302 287 273 261 249 238 227 217 208 200 192 184 177

    2000 471 443 417 394 372 352 334 317 301 286 273 260 248 237 227 217 208 199 191 184 177

    1800 467 440 415 391 370 350 332 315 300 285 272 259 247 236 226 216 207 199 191 183 176

    1500000 1600 462 436 411 388 367 348 330 313 298 284 270 258 246 235 225 216 207 198 190 183 176

    1400 456 430 406 384 364 345 327 311 296 282 269 256 245 234 224 214 206 197 189 182 175

    1200 447 422 400 378 359 340 323 308 293 279 266 254 243 232 222 213 204 196 188 181 174

    1000 434 411 390 370 351 334 318 302 288 275 263 251 240 230 220 211 202 194 187 180 173

    800 412 393 374 356 339 323 308 294 281 269 257 246 235 226 216 208 199 192 184 177 171

    600 375 360 346 331 318 305 292 280 268 257 247 237 227 218 210 202 194 187 180 173 167

    400 305 297 289 281 273 264 256 248 240 232 224 217 209 202 195 189 182 176 170 164 159

    2800 449 422 397 374 353 334 316 300 284 270 257 245 234 223 213 204 196 187 180 173 166

    2600 448 421 396 373 352 333 315 299 284 270 257 245 233 223 213 204 195 187 180 172 166

    2400 446 419 395 372 351 332 315 298 283 269 256 244 233 223 213 204 195 187 179 172 166

    2200 444 417 393 371 350 331 314 297 283 269 256 244 233 222 212 203 195 187 179 172 165

    2000 442 415 391 369 349 330 313 296 282 268 255 243 232 222 212 203 194 186 179 172 165

    1800 438 413 389 367 347 328 311 295 281 267 254 242 231 221 211 202 194 186 178 171 165

    1400000 1600 434 409 386 364 344 326 309 294 279 266 253 241 230 220 211 202 193 185 178 171 164

    1400 429 404 382 361 341 323 307 291 277 264 251 240 229 219 210 201 192 185 177 170 1641200 421 398 376 356 337 320 304 289 275 262 249 238 227 218 208 199 191 184 176 169 163

    1000 410 388 367 348 331 314 299 284 271 258 246 235 225 215 206 198 190 182 175 168 162

    800 392 372 354 337 320 305 291 277 265 253 242 231 221 212 203 195 187 180 173 166 160

    600 359 344 330 316 302 289 277 265 254 243 233 223 214 206 198 190 183 176 169 163 157

    400 297 288 280 271 263 254 246 237 229 221 214 206 199 192 185 179 172 166 161 155 150

  • 8/13/2019 Timber Column2fg

    22/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    221

    UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 30 to 50

    E Fc* 30 31 32 33 34 35 3 6 37 38 3 9 4 0 4 1 4 2 43 44 4 5 46 47 48 49 50

    2800 419 393 370 348 329 311 294 279 265 251 239 228 217 208 198 190 182 174 167 160 154

    2600 417 392 369 347 328 310 293 278 264 251 239 228 217 207 198 190 182 174 167 160 154

    2400 416 391 368 346 327 309 293 278 264 251 238 227 217 207 198 189 181 174 167 160 154

    2200 414 389 366 345 326 308 292 277 263 250 238 227 216 207 198 189 181 174 167 160 154

    2000 412 387 365 344 325 307 291 276 262 249 237 226 216 206 197 189 181 173 166 160 153

    1800 409 385 363 342 323 306 290 275 261 248 237 226 215 206 197 188 180 173 166 159 153

    1600 406 382 360 340 321 304 288 274 260 247 236 225 214 205 196 188 180 172 165 159 153

    1300000 1400 401 378 357 337 319 302 286 272 258 246 234 224 213 204 195 187 179 172 165 158 152

    1200 395 372 352 333 315 299 283 269 256 244 233 222 212 203 194 186 178 171 164 158 152

    1000 385 364 345 326 310 294 279 266 253 241 230 220 210 201 192 184 177 170 163 157 151

    800 370 351 333 317 301 286 273 260 248 237 226 216 207 198 190 182 175 168 161 155 149

    600 342 327 313 299 286 273 261 249 239 228 219 210 201 193 185 178 171 164 158 152 147

    400 287 278 270 261 252 243 234 226 218 210 202 195 188 181 174 168 162 156 151 146 141

    200 176 174 172 170 167 165 162 159 157 154 151 148 145 142 139 136 132 129 126 123 120

    2600 387 363 341 322 303 287 271 257 244 232 221 210 201 192 183 175 168 161 154 148 142

    2400 385 362 340 321 303 286 271 257 244 232 221 210 200 191 183 175 168 161 154 148 142

    2200 384 360 339 320 302 285 270 256 243 231 220 210 200 191 183 175 167 160 154 148 142

    2000 382 359 338 319 301 284 269 255 243 231 220 209 200 191 182 174 167 160 154 148 142

    1800 380 357 336 317 299 283 268 255 242 230 219 209 199 190 182 174 167 160 153 147 142

    1600 377 354 334 315 298 282 267 253 241 229 218 208 198 190 181 174 166 159 153 147 141

    1200000 1400 373 351 331 313 296 280 265 252 239 228 217 207 198 189 181 173 166 159 153 147 141

    1200 368 346 327 309 293 277 263 250 238 226 216 206 196 188 180 172 165 158 152 146 1401000 360 340 321 304 288 273 260 247 235 224 213 204 195 186 178 171 164 157 151 145 139

    800 347 329 312 296 281 267 254 242 231 220 210 201 192 184 176 169 162 155 149 144 138

    600 324 309 295 281 268 256 244 233 223 213 204 195 187 179 172 165 159 153 147 141 136

    400 276 267 258 249 240 231 222 214 206 198 190 183 176 170 163 157 152 146 141 136 131

    200 173 171 169 166 164 161 158 155 152 149 146 143 140 136 133 130 127 123 120 117 114

  • 8/13/2019 Timber Column2fg

    23/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    222UNIT AXIAL STRESSES - SIMPLE SOLID COLUMNS - l/d from 30 to 50

    E Fc* 30 31 3 2 33 34 35 36 37 38 3 9 40 4 1 4 2 43 4 4 4 5 46 47 4 8 49 50

    1800 350 329 309 292 276 261 247 234 222 211 201 192 183 175 167 160 153 147 141 135 130

    1600 347 327 308 290 274 259 246 233 221 211 201 191 182 174 167 159 153 146 141 135 130

    1400 344 324 305 288 272 258 244 232 220 210 200 190 182 174 166 159 152 146 140 135 129

    1200 340 320 302 285 270 256 242 230 219 208 198 189 181 173 165 158 152 145 140 134 129

    1000 333 315 297 281 266 252 240 228 217 206 197 188 179 171 164 157 151 145 139 133 128

    1100000

    800 323 306 289 274 260 247 235 224 213 203 194 185 177 169 162 155 149 143 138 132 127

    600 304 289 275 262 250 238 227 217 207 198 189 181 173 166 159 153 146 141 135 130 125

    400 264 254 245 236 226 218 209 201 193 185 178 171 164 158 152 146 141 136 131 126 121

    200 170 168 165 162 160 157 153 150 147 144 140 137 133 130 127 123 120 117 113 110 107

    2000 321 301 284 267 252 238 226 214 203 193 184 175 167 159 152 146 140 134 128 123 119

    1800 320 300 282 266 251 238 225 213 203 193 183 175 167 159 152 146 139 134 128 123 118

    1600 318 298 281 265 250 237 224 213 202 192 183 174 166 159 152 145 139 133 128 123 118

    1400 315 296 279 263 249 235 223 212 201 191 182 174 166 158 151 145 139 133 128 123 118

    1200 311 293 276 261 247 234 221 210 200 190 181 173 165 157 151 144 138 133 127 122 117

    1000000

    1000 306 289 273 258 244 231 219 208 198 188 180 171 164 156 150 143 137 132 127 122 117

    800 298 282 266 252 239 227 216 205 195 186 177 169 162 155 148 142 136 131 126 121 116

    600 283 269 255 243 231 220 209 199 190 181 173 166 159 152 146 140 134 129 124 119 115

    400 250 240 230 221 212 203 195 187 179 171 165 158 152 146 140 135 129 125 120 116 111

    200 167 164 161 158 155 151 148 144 141 137 134 130 127 123 119 116 113 109 106 103 100

    1600 287 270 254 240 226 214 202 192 182 173 165 157 150 143 137 131 125 120 115 111 106

    1400 285 268 253 238 225 213 202 191 182 173 164 157 149 143 137 131 125 120 115 111 106

    1200 283 266 250 236 223 211 200 190 181 172 164 156 149 142 136 130 125 120 115 110 1061000 278 262 247 234 221 209 199 188 179 171 162 155 148 141 135 129 124 119 114 110 106

    900000

    800 272 257 243 229 217 206 196 186 177 169 161 153 146 140 134 128 123 118 113 109 105

    600 260 247 234 222 211 200 191 181 173 165 158 151 144 138 132 127 121 117 112 108 104

    400 234 224 214 205 196 187 179 171 164 157 151 144 138 133 128 123 118 113 109 105 101

    200 162 159 155 152 148 145 141 137 133 130 126 122 119 115 111 108 105 101 9 8 95 92

  • 8/13/2019 Timber Column2fg

    24/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    223

    UNIT AXIAL STRESSES - SPACED COLUMNS, CONDITION "a" - l/d from 2 to 46

    E Fc* 2 4 6 8 10 12 1 4 16 18 2 0 2 2 2 4 2 6 28 30 3 2 34 36 38 40 42 44 4 6

    4 00 0 3 99 2 3 9 67 3 92 3 3 8 57 3 7 64 3 6 3 7 3 47 2 3 2 63 3 0 1 5 2 74 2 2 4 64 2 1 9 8 1 95 6 1 7 41 1 5 53 1 39 0 1 2 49 1 1 27 1 0 2 1 9 2 8 8 47 7 76 7 13

    3 80 0 3 79 3 3 7 70 3 73 0 3 6 71 3 5 88 3 4 7 6 3 32 9 3 1 43 2 9 2 1 2 67 2 2 4 14 2 1 6 3 1 93 1 1 7 23 1 5 40 1 38 1 1 2 42 1 1 21 1 0 1 6 9 2 5 8 45 7 74 7 12

    3 60 0 3 59 3 3 5 73 3 53 8 3 4 85 3 4 11 3 3 1 2 3 18 3 3 0 19 2 8 2 0 2 59 6 2 3 58 2 1 2 4 1 90 3 1 7 03 1 5 26 1 37 0 1 2 34 1 1 15 1 0 1 2 9 2 1 8 42 7 71 7 09

    3 40 0 3 39 4 3 3 76 3 34 5 3 2 98 3 2 33 3 1 4 6 3 03 2 2 8 89 2 7 1 4 2 51 3 2 2 97 2 0 7 9 1 87 2 1 6 80 1 5 09 1 35 8 1 2 25 1 1 08 1 0 0 6 9 1 7 8 38 7 69 7 07

    3 20 0 3 19 5 3 1 79 3 15 1 3 1 10 3 0 53 2 9 7 7 2 87 9 2 7 54 2 6 0 1 2 42 4 2 2 30 2 0 3 0 1 83 6 1 6 55 1 4 90 1 34 4 1 2 14 1 1 00 1 0 0 0 9 1 2 8 34 7 65 7 05

    3 00 0 2 99 5 2 98 1 2 95 7 2 92 1 2 87 2 2 80 6 2 72 1 2 6 14 2 4 82 2 3 27 2 1 55 1 9 74 1 7 95 1 6 25 1 4 68 1 3 2 7 1 20 2 1 09 1 9 93 9 06 8 29 7 62 7 02

    2 80 0 2 79 6 2 78 4 2 76 3 2 73 2 2 68 9 2 63 3 2 56 1 2 4 69 2 3 57 2 2 23 2 0 73 1 9 12 1 7 48 1 5 91 1 4 43 1 3 0 8 1 18 8 1 08 0 9 84 8 99 8 24 7 57 6 98

    2 10 00 00 2 60 0 2 59 7 2 5 86 2 56 8 2 5 41 2 5 05 2 4 5 8 2 39 6 2 3 19 2 2 2 5 2 11 2 1 9 82 1 8 4 1 1 69 5 1 5 51 1 4 13 1 28 6 1 1 71 1 0 67 9 7 4 8 91 8 18 7 52 6 94

    2 40 0 2 39 7 2 38 8 2 37 3 2 35 0 2 32 0 2 28 0 2 22 9 2 1 65 2 0 86 1 9 92 1 8 83 1 7 62 1 6 34 1 5 04 1 3 78 1 2 6 0 1 15 1 1 05 1 9 62 8 82 8 10 7 46 6 89

    2 20 0 2 19 8 2 19 0 2 17 7 2 15 8 2 13 3 2 10 0 2 05 8 2 0 06 1 9 42 1 8 65 1 7 74 1 6 73 1 5 63 1 4 49 1 3 36 1 2 2 8 1 12 6 1 03 3 9 47 8 70 8 01 7 39 6 83

    2 00 0 1 99 8 1 99 2 1 98 1 1 96 6 1 94 5 1 91 8 1 88 5 1 8 42 1 7 91 1 7 29 1 6 56 1 5 73 1 4 82 1 3 85 1 2 86 1 1 8 9 1 09 6 1 01 0 9 29 8 56 7 90 7 30 6 75

    1 80 0 1 79 8 1 79 3 1 78 5 1 77 2 1 75 6 1 73 5 1 70 8 1 67 5 1 63 4 1 58 6 1 52 9 1 46 3 1 38 9 1 31 0 1 22 6 1 14 2 1 05 9 9 81 9 07 8 38 7 75 7 18 6 66

    1 60 0 1 59 9 1 59 5 1 58 8 1 57 8 1 56 5 1 54 9 1 52 8 1 50 3 1 47 2 1 43 5 1 39 2 1 34 2 1 28 4 1 22 1 1 15 4 1 08 3 1 01 3 9 44 8 78 8 15 7 57 7 03 6 54

    1 40 0 1 39 9 13 96 1 3 91 1 3 84 1 37 4 13 61 1 34 6 1 32 7 13 04 1 27 7 1 24 6 1 20 9 11 66 1 11 9 10 67 1 0 11 9 5 4 8 96 8 39 7 84 7 32 6 83 6 38

    1 20 0 1 19 9 11 97 1 19 3 11 88 1 18 1 11 72 1 16 1 11 47 1 13 1 11 12 1 09 0 10 64 1 03 5 10 01 9 64 9 23 8 80 8 34 7 89 7 43 6 98 6 56 6 15

    3 60 0 3 59 3 3 57 2 3 53 4 3 47 9 3 40 1 3 29 5 3 15 7 2 9 82 2 7 72 2 5 38 2 2 94 2 0 56 1 8 36 1 6 39 1 4 65 1 3 1 4 1 18 2 1 06 7 9 68 8 80 8 04 7 37 6 77

    3 40 0 3 39 4 3 37 5 3 34 2 3 29 2 3 22 4 3 13 1 3 01 0 2 8 57 2 6 71 2 4 61 2 2 38 2 0 16 1 8 08 1 6 19 1 4 51 1 3 0 3 1 17 4 1 06 1 9 63 8 77 8 01 7 34 6 75

    3 20 0 3 19 5 3 17 8 3 14 9 3 10 5 3 04 5 2 96 4 2 85 9 2 7 26 2 5 64 2 3 77 2 1 75 1 9 71 1 7 76 1 5 96 1 4 34 1 2 9 0 1 16 4 1 05 4 9 57 8 72 7 97 7 31 6 73

    3 00 0 2 99 5 2 98 0 2 95 5 2 91 7 2 86 5 2 79 5 2 70 4 2 5 90 2 4 50 2 2 86 2 1 06 1 9 21 1 7 39 1 5 69 1 4 14 1 2 7 6 1 15 3 1 04 6 9 51 8 67 7 93 7 28 6 70

    2 80 0 2 79 6 2 78 3 2 76 1 2 72 8 2 68 3 2 62 3 2 54 6 2 4 48 2 3 29 2 1 88 2 0 30 1 8 63 1 6 97 1 5 38 1 3 92 1 2 5 9 1 14 1 1 03 6 9 43 8 61 7 89 7 24 6 67

    2 00 00 00 2 60 0 2 59 6 2 5 85 2 56 6 2 5 38 2 5 00 2 4 4 9 2 38 4 2 3 02 2 2 0 1 2 08 1 1 9 45 1 7 9 8 1 64 8 1 5 02 1 3 65 1 23 9 1 1 26 1 0 24 9 3 4 8 54 7 83 7 20 6 63

    2 40 0 2 39 7 2 38 8 2 37 1 2 34 8 2 31 5 2 27 3 2 21 9 2 1 51 2 0 67 1 9 66 1 8 51 1 7 24 1 5 92 1 4 60 1 3 33 1 2 1 5 1 10 8 1 01 0 9 23 8 46 7 76 7 14 6 592 20 0 2 19 7 2 19 0 2 17 6 2 15 6 2 13 0 2 09 5 2 05 0 1 99 4 1 92 6 1 84 3 1 74 8 1 64 1 1 52 7 1 41 0 1 29 6 1 18 7 1 08 6 9 94 9 10 8 35 7 68 7 08 6 54

    2 00 0 1 99 8 1 99 1 1 98 0 1 96 4 1 94 2 1 91 4 1 87 8 1 83 3 1 77 8 1 71 2 1 63 5 1 54 7 1 45 1 1 35 1 1 25 0 1 15 2 1 05 9 9 73 8 94 8 23 7 58 7 00 6 47

    1 80 0 1 79 8 1 79 3 1 78 4 1 77 1 1 75 4 1 73 1 1 70 3 1 66 7 1 62 4 1 57 3 1 51 2 1 44 2 1 36 4 1 28 1 1 19 5 1 10 9 1 02 6 9 47 8 74 8 07 7 45 6 89 6 39

    1 60 0 1 59 9 15 94 1 5 87 1 5 77 1 56 4 15 46 1 52 4 1 49 7 14 64 1 42 5 1 37 9 1 32 5 12 65 1 19 8 11 28 1 0 56 9 8 4 9 14 8 48 7 86 7 29 6 76 6 28

    1 40 0 1 39 9 13 96 1 39 0 13 83 1 37 2 13 59 1 34 3 13 23 1 29 9 12 70 1 23 6 11 97 1 15 2 11 01 1 04 7 98 9 9 30 8 71 8 13 7 58 7 06 6 58 6 13

  • 8/13/2019 Timber Column2fg

    25/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    224UNIT AXIAL STRESSES - SPACED COLUMNS, CONDITION "a" - l/d from 2 to 46

    E Fc* 2 4 6 8 10 12 14 16 18 2 0 22 2 4 2 6 28 3 0 3 2 34 36 3 8 40 42 44 46

    3 60 0 3 59 3 3 57 0 3 53 1 3 47 2 3 38 9 3 27 6 3 12 8 2 94 1 2 71 9 2 47 4 2 2 25 1 9 86 1 7 67 1 5 73 1 4 04 1 2 57 1 1 29 1 0 19 9 2 3 8 40 7 66 7 02 6 45

    3 40 0 3 39 3 3 37 3 3 33 8 3 28 6 3 21 3 3 11 4 2 98 4 2 82 1 2 62 4 2 40 3 2 1 74 1 9 50 1 7 42 1 5 55 1 3 91 1 2 47 1 1 22 1 0 13 9 1 9 8 36 7 64 7 00 6 43

    3 20 0 3 19 4 3 17 7 3 14 6 3 10 0 3 03 6 2 95 0 2 83 7 2 69 4 2 52 2 2 32 6 2 1 17 1 9 09 1 7 13 1 5 35 1 3 76 1 2 36 1 1 14 1 0 07 9 1 4 8 32 7 60 6 97 6 41

    3 00 0 2 99 5 2 97 9 2 95 2 2 91 2 2 85 7 2 78 2 2 68 5 2 56 3 2 41 3 2 24 1 2 0 53 1 8 63 1 6 80 1 5 11 1 3 58 1 2 23 1 1 04 1 0 00 9 0 8 8 28 7 57 6 94 6 39

    2 80 0 2 79 6 2 78 2 2 75 9 2 72 4 2 67 6 2 61 3 2 53 0 2 42 5 2 29 7 2 14 8 1 98 3 1 81 1 1 64 2 1 48 3 1 33 8 1 20 8 1 09 3 9 91 9 01 8 22 7 53 6 91 6 36

    2 60 0 2 59 6 2 58 5 2 56 4 2 53 5 2 49 4 2 44 0 2 37 1 2 28 3 2 17 5 2 04 7 1 90 4 1 75 1 1 59 8 1 45 1 1 31 5 1 19 0 1 07 9 9 81 8 93 8 16 7 47 6 87 6 33

    2 40 0 2 39 7 2 38 7 2 37 0 2 34 5 2 31 1 2 26 5 2 20 7 2 13 4 2 04 5 1 93 8 1 81 6 1 68 3 1 54 7 1 41 3 1 28 6 1 16 9 1 06 3 9 68 8 84 8 08 7 42 6 82 6 29

    1 90 00 00 2 20 0 2 19 7 2 18 9 2 17 5 2 15 4 2 12 5 2 08 8 2 04 1 1 98 1 1 90 8 1 82 0 1 7 18 1 6 06 1 4 87 1 3 68 1 2 52 1 1 44 1 0 44 9 5 4 8 72 7 99 7 34 6 76 6 24

    2 00 0 1 99 8 1 99 1 1 97 9 1 96 2 1 93 9 1 90 9 1 87 0 1 82 3 1 76 4 1 69 3 1 61 1 1 51 8 1 41 8 1 31 4 1 21 1 1 11 3 1 02 0 9 35 8 58 7 88 7 25 6 69 6 18

    1 80 0 1 79 8 17 93 1 7 83 1 76 9 17 51 1 7 27 1 6 97 1 65 9 16 13 1 55 8 1 49 3 14 19 1 33 7 1 25 0 1 16 1 10 74 9 9 0 9 12 8 40 7 74 7 14 6 60 6 11

    1 60 0 1 59 9 15 94 1 5 87 1 57 6 15 62 1 5 43 1 5 20 1 49 1 14 56 1 41 4 1 36 4 13 07 1 24 3 1 17 3 1 10 0 10 25 9 5 2 8 82 8 17 7 55 6 99 6 48 6 01

    1 40 0 1 39 9 13 96 1 39 0 13 82 1 37 1 13 57 1 33 9 13 18 1 29 2 12 62 1 22 5 11 83 1 13 5 10 82 1 02 4 96 4 9 04 8 44 7 86 7 31 6 80 6 32 5 88

    1 20 0 1 19 9 11 97 1 19 3 11 87 1 17 9 11 69 1 15 6 11 41 1 12 3 11 01 1 07 6 10 47 1 01 3 97 5 9 33 8 88 8 40 7 92 7 44 6 97 6 52 6 10 5 70

    1000 999 998 995 991 985 979 970 960 948 934 917 898 876 850 822 791 758 723 686 650 613 578 544

    3 40 0 3 39 3 3 37 2 3 33 5 3 27 9 3 20 1 3 09 5 2 95 6 2 78 0 2 57 1 2 34 1 2 10 5 1 87 9 1 67 3 1 49 0 1 32 9 1 19 0 1 07 0 9 65 8 74 7 95 7 26 6 65 6 11

    3 20 0 3 19 4 3 17 5 3 14 3 3 09 4 3 02 5 2 93 3 2 81 2 2 65 9 2 47 5 2 26 9 2 05 4 1 84 3 1 64 7 1 47 1 1 31 6 1 18 0 1 06 2 9 59 8 70 7 92 7 23 6 63 6 09

    3 00 0 2 99 5 2 97 8 2 95 0 2 90 7 2 84 8 2 76 8 2 66 4 2 53 2 2 37 3 2 19 0 1 99 6 1 80 2 1 61 8 1 45 0 1 30 1 1 16 9 1 05 4 9 53 8 65 7 88 7 20 6 60 6 07

    2 80 0 2 79 5 2 78 1 2 75 6 2 71 9 2 66 9 2 60 0 2 51 2 2 39 9 2 26 2 2 10 4 1 93 1 1 75 5 1 58 4 1 42 6 1 28 3 1 15 6 1 04 4 9 45 8 59 7 83 7 16 6 57 6 05

    2 60 0 2 59 6 2 58 4 2 56 2 2 53 1 2 48 8 2 43 0 2 35 5 2 26 1 2 14 5 2 00 9 1 85 8 1 70 1 1 54 5 1 39 7 1 26 2 1 14 0 1 03 2 9 36 8 52 7 77 7 12 6 53 6 02

    2 40 0 2 39 7 2 38 6 2 36 8 2 34 2 2 30 5 2 25 7 2 19 5 2 11 6 2 02 0 1 90 6 1 77 7 1 63 9 1 49 9 1 36 3 1 23 7 1 12 2 1 01 8 9 25 8 43 7 71 7 06 6 49 5 98

    2 20 0 2 19 7 2 18 8 2 17 3 2 15 1 2 12 1 2 08 1 2 03 0 1 96 6 1 88 7 1 79 3 1 68 5 1 56 7 1 44 5 1 32 3 1 20 7 1 09 9 1 00 1 9 12 8 33 7 63 7 00 6 44 5 94

    1 80 00 00 2 00 0 1 99 8 1 99 0 1 97 8 1 96 0 1 93 5 1 90 3 1 86 2 1 81 1 1 74 8 1 67 2 1 58 4 1 48 6 1 38 1 1 27 4 1 17 0 1 07 1 9 80 8 96 8 21 7 53 6 92 6 38 5 891 80 0 1 79 8 17 92 1 7 82 1 76 8 17 48 1 7 22 1 6 90 1 65 0 16 00 1 54 1 1 47 1 13 92 1 30 6 1 21 6 1 12 5 10 37 9 5 3 8 76 8 05 7 40 6 82 6 30 5 82

    1 60 0 1 59 8 15 94 1 58 6 15 75 1 55 9 15 40 1 51 5 14 84 1 44 6 14 01 1 34 8 12 87 1 21 9 11 45 1 06 9 99 3 9 19 8 49 7 84 7 24 6 69 6 19 5 74

    1 40 0 1 39 9 13 95 1 38 9 13 81 1 36 9 13 54 1 33 6 13 13 1 28 5 12 52 1 21 3 11 68 1 11 7 10 60 1 00 0 93 8 8 76 8 15 7 57 7 02 6 52 6 05 5 62

    1 20 0 1 19 9 11 97 1 19 2 11 86 1 17 7 11 67 1 15 4 11 37 1 11 8 10 95 1 06 8 10 36 1 00 0 95 9 9 14 8 67 8 18 7 68 7 19 6 72 6 28 5 86 5 47

    1000 999 998 995 990 985 977 968 958 945 929 912 891 867 840 810 777 742 705 667 630 593 557 523

    800 800 798 797 794 790 786 780 773 766 756 746 733 719 703 685 665 643 619 594 567 540 513 487

  • 8/13/2019 Timber Column2fg

    26/47

    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    225

    UNIT AXIAL STRESSES - SPACED COLUMNS, CONDITION "a" - l/d from 2 to 46

    E Fc* 2 4 6 8 10 12 1 4 16 18 2 0 2 2 2 4 2 6 28 30 3 2 34 36 38 40 42 44 4 6

    3 20 0 3 19 4 3 17 4 3 13 9 3 08 7 3 01 3 2 91 4 2 78 4 2 61 9 2 42 3 2 20 7 1 98 5 1 77 3 1 57 9 1 40 6 1 25 5 1 12 4 1 01 0 9 11 8 26 7 51 6 85 6 28 5 77

    3 00 0 2 99 4 2 97 7 2 94 7 2 90 1 2 83 8 2 75 2 2 64 0 2 49 8 2 32 7 2 13 5 1 93 3 1 73 6 1 55 3 1 38 7 1 24 1 1 11 4 1 00 2 9 06 8 21 7 47 6 83 6 26 5 75

    2 80 0 2 79 5 27 80 2 7 54 2 7 14 2 66 0 25 87 2 49 1 2 37 0 22 23 2 05 5 1 87 5 1 69 4 15 23 1 36 6 12 26 1 1 02 9 9 4 8 99 8 16 7 43 6 79 6 23 5 73

    2 60 0 2 59 6 25 83 2 5 60 2 5 27 2 48 0 24 18 2 33 8 2 23 6 21 11 1 96 7 1 80 8 1 64 6 14 88 1 34 1 12 07 1 0 88 9 8 3 8 91 8 10 7 38 6 75 6 20 5 70

    2 40 0 2 39 6 23 85 2 3 66 2 3 38 2 29 9 22 47 2 18 0 2 09 6 19 92 1 87 0 1 73 3 1 59 0 14 47 1 31 1 11 85 1 0 72 9 7 1 8 81 8 02 7 33 6 71 6 16 5 67

    2 20 0 2 19 7 21 88 2 1 72 2 1 48 2 11 6 20 73 2 01 8 1 94 9 18 64 1 76 3 1 64 9 1 52 5 13 98 1 27 5 11 59 1 0 52 9 5 6 8 70 7 93 7 25 6 65 6 11 5 64

    2 00 0 1 99 7 19 90 1 9 77 1 9 57 1 93 1 18 97 1 85 2 1 79 7 17 29 1 64 7 1 55 3 1 45 0 13 41 1 23 2 11 26 1 0 28 9 3 8 8 56 7 82 7 17 6 58 6 06 5 59

    1 70 00 00 1 80 0 1 79 8 1 79 2 1 78 1 1 76 6 1 74 5 1 71 7 1 68 3 1 63 9 1 58 6 1 52 2 1 44 7 1 36 3 1 27 2 1 17 9 1 08 6 9 97 9 14 8 38 7 68 7 06 6 49 5 99 5 53

    1 60 0 1 59 8 15 93 1 58 5 15 73 1 55 7 15 36 1 50 9 14 76 1 43 5 13 87 1 32 9 12 64 1 19 1 11 15 1 03 6 95 9 8 84 8 15 7 50 6 92 6 38 5 90 5 46

    1 40 0 1 39 9 13 95 1 38 9 13 79 1 36 7 13 51 1 33 1 13 07 1 27 7 12 42 1 19 9 11 51 1 09 6 10 36 9 73 9 09 8 45 7 84 7 26 6 73 6 23 5 77 5 36

    1 20 0 1 19 9 11 96 1 19 2 11 85 11 76 1 16 5 1 15 1 11 33 1 11 2 1 08 7 10 58 1 02 4 9 85 9 41 8 94 8 44 7 93 7 43 6 93 6 46 6 02 5 60 5 22

    1000 999 997 994 990 984 976 966 955 941 924 905 883 857 828 796 761 724 685 646 608 571 535 502

    800 800 798 796 793 790 785 779 772 763 753 742 729 713 696 676 655 631 606 579 552 524 496 469

    600 600 599 598 596 594 592 588 584 580 575 569 562 554 545 535 524 512 498 483 467 451 433 415

    3 20 0 3 19 3 31 72 3 1 35 3 0 79 3 00 0 28 92 2 75 1 2 57 3 23 65 2 13 8 1 91 2 1 69 9 15 07 1 33 8 11 92 1 0 65 9 5 7 8 62 7 81 7 10 6 47 5 93 5 45

    3 00 0 2 99 4 29 75 2 9 43 2 8 94 2 82 6 27 33 2 61 2 2 45 8 22 75 2 07 3 1 86 6 1 66 7 14 84 1 32 2 11 80 1 0 57 9 5 0 8 57 7 77 7 06 6 45 5 91 5 43

    2 80 0 2 79 5 27 79 2 7 51 2 7 09 2 65 0 25 71 2 46 7 2 33 6 21 78 2 00 0 1 81 3 1 63 0 14 58 1 30 4 11 67 1 0 47 9 4 2 8 52 7 72 7 03 6 42 5 89 5 41

    2 60 0 2 59 5 25 82 2 5 57 2 5 22 2 47 2 24 05 2 31 8 2 20 7 20 73 1 91 9 1 75 3 1 58 7 14 28 1 28 2 11 51 1 0 35 9 3 3 8 45 7 67 6 99 6 39 5 86 5 39

    2 40 0 2 39 6 23 84 2 3 64 2 3 34 2 29 2 22 36 2 16 4 2 07 2 19 60 1 82 9 1 68 5 1 53 7 13 91 1 25 5 11 31 1 0 21 9 2 3 8 36 7 60 6 94 6 35 5 82 5 36

    2 20 0 2 19 7 21 87 2 1 70 2 1 45 2 11 0 20 64 2 00 5 1 93 0 18 38 1 72 9 1 60 7 1 47 8 13 48 1 22 4 11 08 1 0 04 9 1 0 8 26 7 53 6 88 6 30 5 79 5 33

    2 00 0 1 99 7 19 89 1 97 5 19 55 1 92 6 18 89 1 84 2 17 82 1 70 8 16 20 1 51 9 14 10 1 29 7 11 86 1 08 0 98 2 8 94 8 14 7 43 6 80 6 24 5 74 5 29

    1 60 00 00 1 80 0 1 79 8 1 79 1 1 78 0 1 76 3 1 74 1 1 71 2 1 67 4 1 62 7 1 56 9 1 50 0 1 42 0 1 33 0 1 23 5 1 13 9 1 04 5 9 56 8 73 7 99 7 31 6 70 6 16 5 68 5 241 60 0 1 59 8 15 93 1 58 4 15 71 1 55 4 15 31 1 50 2 14 66 1 42 3 13 70 1 30 8 12 38 1 16 1 10 81 1 00 0 92 2 8 47 7 78 7 15 6 58 6 06 5 60 5 18

    1 40 0 1 39 9 13 95 1 38 8 13 78 1 36 5 13 48 1 32 7 13 00 1 26 8 12 29 1 18 4 11 31 1 07 3 10 09 9 43 8 77 8 13 7 52 6 94 6 41 5 93 5 49 5 09

    1 20 0 1 19 9 11 96 1 19 1 11 84 11 75 1 16 2 1 14 7 11 28 1 10 6 1 07 9 10 47 1 01 0 9 68 9 21 8 71 8 19 7 67 7 15 6 65 6 18 5 75 5 34 4 97

    1000 999 997 994 989 982 974 964 952 937 919 898 874 846 815 780 743 704 664 624 585 548 512 479

    800 800 798 796 793 789 784 777 770 761 750 738 723 707 688 667 643 618 591 563 535 506 478 451

    600 600 599 598 596 594 591 588 583 579 573 566 559 551 541 530 518 505 490 474 457 440 421 403

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    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    226UNIT AXIAL STRESSES - SPACED COLUMNS, CONDITION "a" - l/d from 2 to 46

    E Fc* 2 4 6 8 10 12 14 16 18 2 0 22 2 4 2 6 28 3 0 3 2 34 36 3 8 40 42 44 46

    3 00 0 2 99 4 29 74 2 93 9 28 87 2 81 3 27 12 2 57 9 24 13 2 21 7 20 05 1 79 2 15 93 1 41 3 12 55 1 11 7 99 9 8 97 8 08 7 32 6 65 6 07 5 56 5 11

    2 80 0 2 79 4 27 77 2 74 7 27 02 2 63 8 25 52 2 43 9 22 97 2 12 7 19 39 1 74 6 15 60 1 39 0 12 38 1 10 6 99 0 8 90 8 03 7 28 6 62 6 04 5 54 5 09

    2 60 0 2 59 5 25 80 2 55 5 25 16 2 46 2 23 89 2 29 4 21 74 2 02 9 18 65 1 69 3 15 23 1 36 3 12 19 1 09 2 98 0 8 82 7 97 7 23 6 58 6 02 5 51 5 07

    2 40 0 2 39 6 23 83 2 36 1 23 29 2 28 4 22 23 2 14 4 20 44 1 92 3 17 83 1 63 2 14 79 1 33 2 11 97 1 07 5 96 8 8 73 7 90 7 18 6 54 5 98 5 49 5 05

    2 20 0 2 19 7 21 86 2 16 8 21 41 2 10 3 20 54 1 98 9 19 07 1 80 7 16 91 1 56 1 14 27 1 29 4 11 69 1 05 5 95 3 8 62 7 82 7 11 6 49 5 94 5 45 5 02

    2 00 0 1 99 7 19 88 1 97 3 19 51 1 92 1 18 81 1 82 9 17 64 1 68 3 15 88 1 48 1 13 65 1 24 9 11 36 1 03 1 93 5 8 48 7 71 7 03 6 42 5 89 5 41 4 99

    1 80 0 1 79 8 17 91 1 77 9 17 61 1 73 7 17 05 1 66 4 16 13 1 55 0 14 75 1 38 8 12 93 1 19 4 10 95 1 00 0 91 2 8 31 7 58 6 92 6 34 5 82 5 36 4 94

    1 50 00 00 1 60 0 1 59 8 15 93 1 58 3 15 69 1 55 0 15 26 1 49 5 14 56 1 40 8 13 50 1 28 3 12 08 1 12 7 10 44 9 61 8 82 8 08 7 40 6 79 6 24 5 74 5 29 4 89

    1 40 0 1 39 9 13 94 1 38 7 13 77 1 36 2 13 44 1 32 1 12 92 1 25 7 12 15 1 16 6 11 09 1 04 6 97 9 9 11 8 43 7 78 7 17 6 61 6 09 5 62 5 20 4 81

    1 20 0 1 19 9 1 19 6 1 19 1 1 18 3 1 17 3 1 16 0 1 14 3 1 12 3 1 09 8 1 06 9 1 03 4 9 94 9 49 8 99 8 46 7 92 7 38 6 85 6 36 5 89 5 46 5 07 4 71

    1000 999 997 993 988 981 972 961 948 932 912 890 863 833 799 762 722 682 640 600 560 523 488 455

    800 800 798 796 793 788 783 776 768 758 746 733 717 699 678 655 630 603 575 545 516 487 458 431

    600 600 599 598 596 593 590 587 582 577 571 564 556 547 536 524 511 497 481 464 446 427 408 389

    400 400 400 399 398 397 396 394 392 390 388 385 381 378 374 369 364 358 352 345 338 330 321 312

    2 80 0 2 79 4 27 75 2 74 3 26 94 2 62 5 25 31 2 40 7 22 52 2 06 9 18 71 1 67 3 14 86 1 31 9 11 71 1 04 3 93 2 8 37 7 55 6 83 6 21 5 67 5 19 4 77

    2 60 0 2 59 5 25 79 2 55 1 25 09 2 45 1 23 71 2 26 7 21 36 1 97 9 18 05 1 62 6 14 54 1 29 6 11 55 1 03 1 92 4 8 30 7 49 6 79 6 18 5 64 5 17 4 75

    2 40 0 2 39 6 23 82 2 35 9 23 23 2 27 4 22 08 2 12 2 20 12 1 88 0 17 30 1 57 2 14 16 1 26 9 11 35 1 01 7 91 3 8 23 7 43 6 74 6 14 5 61 5 14 4 73

    2 20 0 2 19 6 21 85 2 16 5 21 36 2 09 6 20 41 1 97 1 18 81 1 77 2 16 46 1 50 9 13 70 1 23 6 11 12 1 00 0 90 1 8 13 7 36 6 69 6 10 5 57 5 11 4 71

    2 00 0 1 99 7 19 88 1 97 1 19 48 1 91 5 18 71 1 81 4 17 43 1 65 5 15 52 1 43 7 13 16 1 19 7 10 83 9 79 8 85 8 01 7 27 6 62 6 04 5 53 5 08 4 68

    1 80 0 1 79 8 17 90 1 77 7 17 58 1 73 2 16 97 1 65 3 15 97 1 52 8 14 46 1 35 2 12 52 1 14 8 10 48 9 53 8 65 7 86 7 16 6 53 5 97 5 47 5 03 4 64

    1 40 00 00 1 60 0 1 59 8 15 92 1 58 2 15 67 1 54 7 15 20 1 48 6 14 43 1 39 1 13 28 1 25 5 11 75 1 08 9 10 03 9 19 8 40 7 67 7 01 6 41 5 88 5 40 4 97 4 59

    1 40 0 1 39 9 13 94 1 38 6 13 75 1 36 0 13 40 1 31 5 12 83 1 24 5 11 99 1 14 4 10 83 1 01 6 94 6 8 75 8 06 7 41 6 81 6 26 5 76 5 31 4 90 4 531 20 0 1 19 9 1 19 6 1 19 0 1 18 2 1 17 1 1 15 6 1 13 9 1 11 6 1 09 0 1 05 7 1 01 9 9 75 9 26 8 73 8 17 7 61 7 06 6 54 6 04 5 59 5 17 4 79 4 44

    1000 999 997 993 987 980 970 958 944 926 905 880 851 818 781 741 700 657 614 573 534 497 463 431

    800 800 798 796 792 787 781 774 765 754 742 727 710 690 667 642 615 586 556 526 495 466 437 410

    600 600 599 598 596 593 590 586 581 575 569 561 552 542 530 517 503 487 470 452 433 413 393 373

    400 400 400 399 398 397 395 394 392 389 387 384 380 376 371 366 361 355 348 340 332 323 314 304

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    See instructions for use of tables on page 210. Obtain design values for E and Fcfrom theNational Design Specification for Wood Construction. Modify F

    cfor different

    load duration, if applicable (see page 13). Calculate l/d where l=unsupported length of column in inches and d=applicable least actual dimension of column cross section.

    Determine value of Fc' from table.

    Total design load on column = cross-sectional area in square inches times Fc' value.

    l/d

    227

    UNIT AXIAL STRESSES - SPACED COLUMNS, CONDITION "a" - l/d from 2 to 46

    E Fc* 2 4 6 8 10 12 1 4 16 18 2 0 2 2 2 4 2 6 28 30 3 2 34 36 38 40 42 44 4 6

    2 80 0 2 79 4 27 74 2 73 8 26 85 2 60 9 25 06 2 36 9 21 99 2 00 3 17 96 1 59 4 14 08 1 24 4 11 01 9 78 8 73 7 83 7 05 6 38 5 79 5 28 4 83 4 44

    2 60 0 2 59 4 25 77 2 54 7 25 02 2 43 8 23 50 2 23 5 20 91 1 92 1 17 37 1 55 3 13 80 1 22 4 10 87 9 68 8 66 7 77 7 01 6 34 5 77 5 26 4 82 4 43

    2 40 0 2 39 5 23 81 2 35 5 23 17 2 26 3 21 90 2 09 5 19 75 1 83 1 16 71 1 50 6 13 48 1 20 1 10 71 9 57 8 57 7 71 6 96 6 30 5 73 5 24 4 80 4 41

    2 20 0 2 19 6 21 84 2 16 2 21 31 2 08 6 20 27 1 94 9 18 50 1 73 1 15 9