8/11/2019 [0]-HVAC Duct Support Load Calc - Unknown

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HVAC Duct Support Load Calculation

1. Essential Parameter

Duct size = a×b mm

Concrete Strength = 4500 PSI

Drawing or re erence ! CP" air#ort$%&E$''I($%E$)*(C$DE+$01 CSCEC,- /$''I($%&E$)*(C$S PP/ + DE+(I2,03

3. 2oa Calculation o 'ottom Channel

1 "ra it6 2oa Calculations!

-or ectangular Duct P=1.75×3×8a b ×2×9×:;.5×10 ,<

In the ormula

P , "ra it6 loa > here the uct is insulate ? the weight o insulation base on glass

wool 8 ensit6 @=<4Ag$m 7? thicBness 50mm shoul be inclu e .

1.75 , Sa et6 -actor

1.5 , Sa et6 coe icient 8in case the central su##ort #oint loses e icienc6 >

a? b , i th an height o rectangular uct? mm

2 , Su##ort s#acing? mm

9 , +hicBness o uct? mm

:;.5×10 ,< , *olume weight? $mm 7

3 Strength Calculation o 'ottom Channel

%=0.35×P×2 0

In the ormula

% , 'en ing moment? mm

P , "ra it6 loa ?

2 0 , 2ength o 'ottom Channel? mm 1=%$

In the ormula

, Section mo ulus? mm 7

% , 'en ing moment? mm

1, Com#ressi e strength an le ural strength o channel steel? $mm 3

+he section mo ulus o su##ort channel steel is a ailable in "',+ :0:,;; "',+ F:;:,1F;;.

'ottom channel steel shall be calculate base on (S+% ( 7<$( 7<%,07a steel with esigne

com#ressi e strength G 1H=350 $mm 3. (s long as 1 G 1H? the bottom channel can meet the

reJuirement o strength.

7. Calculation o Strength o )anger o

1 "ra it6 2oa Calculations!

C6lin rical bolt - 1=8PK" $n 1

In the ormula!

- 1, 2oa borne b6 hanger ro

P , "ra it6 o uct

n1 , umber o hanger ro s in one set o su##ort an hanger

" , eight o bottom channel Densit6 o steel @=:.;5g$cm 7

3 Calculation o tensile strength

3=- 1$(In the ormula!

8/11/2019 [0]-HVAC Duct Support Load Calc - Unknown

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- 1 , 2oa borne b6 hanger ro

( , +ension area o hanger ro mm 3

3 , +ensile strength o hanger ro $mm 3

)anger ro shall be calculate base on (S+% ( 7<$( 7<%,07a steel with esigne tensile

strength G 3H=400 $mm 3. here 3 G 3H? the hanger ro can meet the reJuirement o this #roLect.4. Calculation o 'earing Ca#acit6 o E #ansion 'olt

- 3=- 1$n3 8n3 re ers to the number o e #ansion bolts or installation o a hanger ro

+he esigne tensile strength or shear stress -M o e #ansion bolt is a ailable in the #ro uct

manual . here - 3 -M? the e #ansion bolt can meet the reJuirement o this #roLect.

5. Diagram o Su##ort an )anger

<.-or %ore 2oa Calculation o Ducts o Di erent Sizes in +his ProLect? #lease re er to the

attachment.