8/11/2019 R.P.C. - Lecture 10

1/7

w

ffi

tQsllrf

Reinforced

and

Prestressed

Concrete - C

r0-rr

-

ffiw

w

fi

rlqglgF

T

beams

-

Effective width

of flanqes

.

the

slab

is assumed

to carry the loads in

one

direction

to beams

that

carry

them

in

the

perpendicular

direction.

.

the

concrete

in

the

columns is

placed

and

allowed to harden

before

the

concrete

in

the floor is

placed.

.

in

the

next operation,

the

concrete is

placed

in the

slab

and beams in

a

monolithic

way.

--Lrk'"

po

ci|j|*non

8/11/2019 R.P.C. - Lecture 10

2/7

w

:ar**

ffi

Moment

reqions in

a T beam

{r}

O{llslt4d

t6nn.

b"1

1..*..*---{

ffi

ql-j-Tfin

r:r-TtT-

lul

\co'',..n*r-"...--@[

\rw'ennintqshri:

\LgJl

pl

66rs

A-A

Itrbr$ra

rwrsliocffi-

f'1

{c}

Sdron

9.g

{dt

ira ,s

A"A

{t-r+at+d

.#rrt *oF ecel,

w

He

ffi

Stresses and

resultant

forces

on a T beam

flanqe

lftsE

8/11/2019 R.P.C. - Lecture 10

3/7

iffit

tm

re

{bl

fbil*#

@l s.r6dr* i"lrp$ d&e.*ir

asF$ad

b

CdgE

UttFiittdF

Dt

{sdiFrasyc

s f6s

i*

iargE

iel

&sntut0n

6l

{Hrlru0ffi lbilrd

ffiprsqi

slfoa*es

re

ffi

Compression stresses in T beams

-

real

and design situations

design

situation

8/11/2019 R.P.C. - Lecture 10

4/7

lffi

ffi

Com

pression

stresses

distribution

,.,----*1e.-

.

i

x-

ri

tt*

---.ila/".,

mav.6.2

*t::...__

r

19 ti

le

-L-*--s*---+

single beam

monolithic

slab

with

beams

Equivalent comDression

stresses

area

Xim"J

_r+l

d

I

-_f

-+

bd

*.*_-q

'':j-

o

F':

,,

8/11/2019 R.P.C. - Lecture 10

5/7

Effective

width of flanqes

The

effective flange width

of T beams, depends on:

.

the

web

and

flange dimensions,

.

the

type of

loading,

.

the span,

.

the

support conditions,

.

the transverse

reinforcement.

The

design

of

the effective flange width is

based

on

the

distance

ls

between

points

of

zero

moment:

lo:{,l5L.r:+Lr:

/

.-

/

wt

ffi

:tffi

The

effective flanqe

width b^o@

{

u"u.,=0,2b,

+o,llo

3o,2lo

lb"o',