60334188 Analysis and Design of a Multi Storey Reinforced Concrete

8/13/2019 60334188 Analysis and Design of a Multi Storey Reinforced Concrete

1/61

1

Analysis and Design of a Multi-storeyReinforced Concrete Building

United Arab Emirates University

College of Engineering

Civil and Environmental Engineering Department

Graduation Project II

Second Semester 2007/2008

PreparedSultan Saif Saeed Alneyadi 200203903Sultan Khais A!-shasi 200101"9"#asher Khais A!-a$i$i 20010%031Rashed #aad A!-&eyadi 20020'01(

A)dulrahan A)dulla *arrah 20021091"Adviser

Dr. Usama Ebead


2/61

2

Outline

Objectives Summary General Approach Building Types Concrete Structural Elements Slabs

Flat Slab Design o Flat Slab

Columns !ectangular Columns Design o !ectangular Columns

Shear "alls Design o Shear #alls

Foundations

$ile Group Design o $ile Group Economic %mpact Environmental %mpact Conclusion


3/61

3

Objectives

The Objectives of the Project are:-

Carrying out a complete analysis and design o the main structural elements o

a multi&storey building including slabs' columns' shear "alls and oundations

Getting amiliar "ith structural sot"ares ( SAFE 'AutoCAD)

Getting real lie e*perience "ith engineering practices


4/61

'

Summary

Our graduation project is a residential building in Abu& Dhabi+

This building consists o ,- repeated loors+


5/61

"

General Approach

Obtaining an architectural design o a regular residential multi&

storey building+ Al&Su"aidy residential building in Abu Dhabi+

Establishing the structural system or the ground' and repeated

loors o the building+

The design o column' "ind resisting system' and type o

oundations "ill be determined ta.ing into consideration the

architectural dra"ings+


6/61

%

Types o building

Buildings are be divided into/ Apartment building

Apartment buildings are multi&story buildings "here three or more

residences are contained "ithin one structure+

Oice buildingThe primary purpose o an oice building is to provide a "or.place and

"or.ing environment or administrative "or.ers+


7/61

+

!esidential buildings


8/61

(

Oice buildings


9/61

9

Concrete 0i*tures

Concrete is a durable material "hich is ideal or many jobs+

The concrete mi* should be "or.able+

%t is important that the desired 1ualities o the hardened concrete

are met+

Economy is also an important actor+


10/61

10

Structural Elements

Any reinorced concrete structure consists o /

Slabs

Columns Shear "alls

Foundations


11/61

11

Flat Slab Structural System

Flat slab is a concrete slab "hich is reinorced in t"o directions

Advantages

Disadvantages


12/61

12

Types o Flat slab


13/61

13

Deining properties

Slab thic.ness 2 -3 cm

Concrete compressive strength 2 34 0$a

0odules o elasticity o concrete 2 -44 G$a

5ielding strength o steel 2 6-4 0$a

Combination o loads (,+6Dead 7oad 8 ,+9 7ive 7oad)


14/61

1'

AC% 3,:&4-

AC% 3,:&4- contains the current code re1uirements or

concrete building design and construction+

The design load combinations are the variouscombinations o the prescribed load cases or "hich the

structure needs to be chec.ed+

1.2 DL + 1.6 LL


15/61

1"1"

Flat Slab Analysis and Design

Analy;ing o lat slab mainly is done to ind

,+ Shear orces+

-+ Bending moment+

3+ Delected shape+

6+ !eactions at supports+


16/61

1%1%

!esults and Discussion

Delection


17/61

1+

!esults and Discussion

!eactions at supports must be chec.ed by a simple method+


18/61

1(

Flat Slab !einorcement


19/61

19

Columns

,t is a ertical structural e)er su..orting a/ialco.ressie loads ith or ith-out oents

Su..ort ertical loads fro the floors and roof andtransit these loads to the foundation


20/61

20

Types o column

Spiral columnSpiral column RectangularRectangularcolumncolumn

Tied ColumnsOver o all columns in building in non&seismic regions are tied columns

Spiral ColumnsSpiral columns are generally circular+ %t ma.es the column more ductile+


21/61

21

Steel !einorcement in Columns

The limiting steel ratio ranges bet"een , > to : >+

The concrete strength is bet"een -= 0$a to 6= 0pa+

!einorcing steel strength is bet"een 644 0$a to =44 0pa+


22/61

22

Design procedure

,+ Calculate actored a*ial load $u

-+ Select reinorcement ratio

3+ Concrete strength 2 34 0$a' steel yield strength 2 6-4 0$a

6+ Calculate gross area=+ Calculate area o column reinorcement' As' and select rebar

number and si;e+


23/61

23

Columns to be designed


24/61

2'

uidelines for Colun Reinforceent

7ong !einorcement 0in+ bar diameter ?,-

0in+ concrete covers 64 mm

0in+ 6 bars in case o tied rectangular or circular

0a*imum distance bet"een bars 2 -=4 mm

Short !einorcement ( Stirrups)

7east o/ (,9)@diameter o long bars

least dimension o column (6:)@diameter o ties

dc

S

Asp


25/61

2"

Column Design

cs AA 4,+4=8- # ofbars =


26/61

2%

!einorcement o Columns


27/61

2+

Shear "alls

A shear all is a all that resistslateral ind loads hich acts.arallel to the .lane of the all


28/61

2(

Shear "alls

#ind results in a pressure on the surace o the building

$ressure increases "ith height Positive Pressure, acts to"ards the surace o the building

Neative Pressure, acts a"ay rom the surace o the building(suction)


29/61

29

#ind pressure

q = Velocity pressure

(Wind speed, height and eposure condition!" = "ust #actor that depends on the $uilding sti##ness

%p = &ternal pressure coe##icient


30/61

30

Gust " 'actor E*ternal pressure %pcoe##icient

#or ti## tructures ta)e " =*.

Wind-ard Wall, %p = +*.

Lee-ard Wall, %p = aries $et-een /*.2 0 /*.

Depending on the L 3atioL = 1.4 5 26.1 5 = *.17 8 1 then , %p = /*.


31/61

31

elocity $ressure

V = 16* )5h

9: = ;o $e deter5ined #ro5 the equations

9:t = 1 (leel terrain ad = 1 (use group >>!


32/61

32

,.ortant factor32


33/61

3333

4elocity 5/.osure Coefficient 6Kz7


34/61

3'3'

Design of the ind force

&orth south direction


35/61

3"3"

Shear all a/ial reactions


36/61

3%3%

Calculating 4elocity 8ressure

,6= .mh

4+:=11V

(km/hr)

145

9.5

Zg !4."

$% 1

d &.85

' 1

&.85

p

(*+,d*ard)

&.8

p (*ard) -&.5

(m) 0.18

2 3+gh%

($)

r+b%ar6

3+gh%

(h% )

$ 7$ (k,/m)

1 4" 1.!5 1."0 1.15&5

11 "9.5 ".5 1."4 1.19849

1& "0 ".5 1."1 1.1&!994

9 ".5 ".5 1.8 1.&84"91

8 9 ".5 1.5 1.&58088

! 5.5 ".5 1. 1.&"&4&0

0 ".5 1.18 &.9988!"

5 18.5 ".5 1.14 &.90"&9

4 15 ".5 1.&9 &.91495

" 11.5 ".5 1.&" &.8!1"04

8 ".5 &.95 &.8&!!&

1 4.5 4 &.85 &.!151!0


37/61

3+3+

Design of the ind .ressure

G 4+:=

Cp ("ind"ard) 4+:

Cp (lee"ard) &4+=

B (m) -9+,:

qb = qz (at the top of the building

7evel eight

(;) m

Tributary

eight(ht ) m

; 1; (.nm-) Design #ind $ressure(m-) Design #ind Force ()

"ind "ard(1; G C$)

lee "ard(1b G C$)

"ind "ard(1; G C$)(B)(ht )

lee "ard(1b G C$)(B)(ht

)

Total(loor level)

0oment(+m)

,- 63 ,+H= ,+39 ,+,=4--= 4+H:-,=3 &4+6:::69 3=+:3636= &--+3


38/61

3(3(

Co.uting total oent acting toard &-S Direction

! = total floor le"el #height (z


39/61

3939

#&E Direction Computation

$= 2%&18

'=

18&8

(

7evel eight

(;) m

Tributary

eight

(ht ) m

; 1; (.nm-) Design #ind $ressure(m-) Design #ind Force ()

"ind "ard

(1; G C$)

lee "ard

(1b G C$)

"ind "ard

(1; G C$)(B)(ht )

lee "ard

(1b G C$)(B)(ht )

Total

(loor level)

0oment

(+m)

,- 63 ,+H= ,+39 ,+,=4--= 4+H:-,=3, &4+6:::= -=+H:H=:H< &,9+,,H-6-6 6,+


40/61

'0'0

Design o Shear #all

5ast est direction

&orth south direction


41/61

'1'1

%nteraction Diagram


42/61

'2'2

Shear #all !einorcement


43/61

'3

Foundations

Foundations are structural components used to support

columns and transer loads to the underlying Soil+

!oundations

%solated Combined Strap "all !at

Shallo"

ooting ooting ooting ooting ooting

Caissons $iles

Deep


44/61

''

$ile oundation

Our building is rested on a "ea. soil ormation "hich

canIt resist the loads coming rom our proposed building'

so "e have to choose pile oundation+

8ile ca.

8ilesea: soil

Bearing stratu


45/61

'"

$ile oundation

$iles are structural members that are made o steel'

concrete or timber+


46/61

'%

Function o piles

As "ith other types o oundation' the purpose o a pileoundation is/

To transmit a oundation load to a solid ground

To resist vertical' lateral and uplit load

8iles can )e Timber

Concrete

Steel

Composite


47/61

'+

Concrete piles

General acts Jsual length/ ,4m&-4m

Jsual load/ 344.&3444.

Advantages Corrosion resistance

Can be easily combined "ith a concrete superstructure

Disadvantages

Diicult to achieve proper cuto

Diicult to transport


48/61

'(

$ile oundation

$iles can be divided in to t"o major categories/

,+ End Bearing $iles

% the soil&boring records presence

o bedroc. at the site "ithin a reasonable depth'

piles can be e*tended to the

roc. surace

-+ Friction $iles

#hen no layer o roc. is present depth at a site' point bearing piles become very long

and uneconomical+ %n this type o subsoil' piles are driven through the soter

material to speciied depths+


49/61

'9

$ile Cap !einorcement

$ile caps carrying very heavy point loads tend to produce hightensile stresses at the pile cap+

!einorcement is thus designed to provide/ !esistance to tensile bending orces in the bottom o the cap

!esistance to vertical shear


50/61

"0

Design of the .ile ca.

)earing ca.acity of one .ile;!s 2 K Cu As +7

!ength of .ile .enetration ! < 1( etersAdhesion factor of soil 6clay7 = < 0(

>ntrained shear strength Cu < "0 Diaeter < 09 ?or .iles ith diaeter 09

!s 2 -43=+H=


51/61

"1

First type

@his section shos ho .ile ca.s are designed to carryonly ertical load and the euation used to deterinethe resistance of ca. is

here

8 is the strength of the .ile ca. .er one .ile

is the total force acting on the .ile ca.n is the nu)er of .iles used to su..ort the .ile ca.

n

?

@ i

i =


52/61

"2

Columns layout !eactions ( ertical 7oad )

om, ac%+o, o%a ac%+o,

k: k:

1 19.0" 1555.50

40.85 90.

8 "8.00 4591.9

1& "9"."8 4!&.50

1 458."5 55&&.

" 4&&.85 481&.

4 0!.!4 !5".88

5 "84.14 40&9.08

"& 158." 1899.0

" "55.0 40".1


53/61

"3

Design o pile cap (ertical 7oad only)

8ile Ca. 2 !eaction 2 69,4+6 .

$ile diameter 2 4+< m

Capacity or one pile 2 4+: L =4 L ,: L M L 4+< 2 -43=+H=

eed 3 piles

7ength bet"een piles 2 (-L4+3) 8 (3L4+


54/61

"'

Second type

Second t"peThis section sho"s ho" pile caps are designed to carry

vertical load and lateral loads ( Bending 0oment)' and the

e1uation used to determine the resistance o cap is

=

-

r

r

n

?@

iii


55/61

""

Shear "alls layout reactions

*a ; (:.m) : (:)


56/61

"%

Design o pile cap (ertical 7oad moment)

Shear wall # (1):0 2 ,64H-+,,=9,

N 2 ,--:=+9

Assume : piles

9B@(o@

9B@(o@

r

r

n

?@

@ileo#%apacity

@ileo#%apacity

H=+-43='9H9+-6

)-9+6(L,,=9,+,64H-

:

9+,--:=

H=+-43='9H9+-6

)


57/61

"+

Economical impact

!einorced concrete is proven to be a very economicalsolution in the JAE+

the most aordable solution or multistory building such

as the one "e are ma.ing the analysis and design or+


58/61

"(

Environmental impact

Although the cement production is environmentallychallenging' the inal product o a reinorced concrete

building is environmentally riendly+


59/61

"9

antt Chart


60/61

%0

Conclusion

#e have applied our gained .no"ledge during our graduationproject

#e are able to use structural sot"are ( SAFE )

#e have practiced real lie engineering practices

This G$ enables us to go into the mar.et "ith an e*cellent

bac.ground regarding design o !C

At this point' "e "ould li.e to than. all instructors' engineers'

and Al Ain Consultant Oice or their grateul eort+


61/61

%1

Documents

60334188 Analysis and Design of a Multi Storey Reinforced Concrete