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ffi

ffi

Stress-straan

rclations

ior

the

desiqn

of

sections

2. Parabola-rectangle diagram

for

concrete

under

compression.

3, Bi-linear

stress-skain rslation

in concrete under compression

6+

fo

fa

llgf,s

gr*

"":'*|'-{'-*ij

*

t

*:t*

fur

d

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iut

ffi

aq F

w

ffrlce

Ilffi

Stress-strain relations for

the dSi0h of

sections

2.

{

_F

{l

I

S.ctbr

3ll,rFl. St.l rar

Stsrfiir

Sti3r'

a. recbngslar-pa

rahol c dlagran

b" eq,ilivatenl

rec{;angalar

diegrem

8/11/2019 R.P.C - lecture 4

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8/11/2019 R.P.C - lecture 4

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the ultimate dcsign momeni ifo musl

be balancad by the

mome$

of

resisiaace of

the sec{ion:

F"

=#ress'areaafactio*

=

.1.t. r/.

f"a.b

F"1 -(

fry/

2;

).

A"

z=d-sl7 w

s=

2.x= 2(d-z)

z ir

fhe lerer arrn

hrhxes

theresdisaf fftrce* F

Singly

reinforced

rctangular

section

design

flow chart

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$ingly

reinforc-ed

rectangular

section.

The resistance

mament

design

flow

chart,

ffi

ffi

EfgCSlC-L-the

resistance

moment

using the

rc5? {p-3at1Httrrl

QO2S ld=

20J1,5

=

13.3ii.l,gmm?

0.&

q=

1.9

,{,

=

r$r=4erqr

r4rc,r.=IJ61

=1q1

d

e?lo- *2llw

the steel strain is:

""

="-[; -'J

=

t'"

[#-'J

=*]6

:

qd6$

f

=

ffi

=,,t*