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8/11/2019 R.P.C. - Lecture 10
1/7
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Reinforced
and
Prestressed
Concrete - C
r0-rr
-
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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..*..*---{
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ql-j-Tfin
r:r-TtT-
lul
\co'',..n*r-"...--@[
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pl
66rs
A-A
Itrbr$ra
rwrsliocffi-
f'1
{c}
Sdron
9.g
{dt
ira ,s
A"A
{t-r+at+d
.#rrt *oF ecel,
w
He
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Stresses and
resultant
forces
on a T beam
flanqe
lftsE
8/11/2019 R.P.C. - Lecture 10
3/7
iffit
tm
re
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fbil*#
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asF$ad
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iargE
iel
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slfoa*es
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Compression stresses in T beams
-
real
and design situations
design
situation
8/11/2019 R.P.C. - Lecture 10
4/7
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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
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,,
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',
Recommended