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2
24
Ln
W
M
u
u
=
Ast
bAsb
S
d
b
As
=
db
As
Asfy
a
0.85fcb
=
Asfya0.85fcb
Mu
As
a
fyd
2
=
-
MuAsafyd2
hf
b
Ast
=
r
=
=
90
1000
*
38
S
=
50
*
5
S
fy
d
b
d
b
fy
c
f
A
w
w
s
*
*
>
*
*
=
4
.
1
'
25
.
0
min
fy
db
db
fy
cf
A
w
ws
4.1
'25.0
min
hf
S
5
hfS5