Civil Engineering Reference
In-Depth Information
b.
Computing
ns
:
d
,
EI
, and
P
c
are same as before
0
C
m
0.6
0.4
0.6
14
0.6
1
48
4.16
0.75
731
ns
0.66
Use 1.0
c.
Computing
s
:
d
0 since there is no dead load involved in this case
EI
(0.4)(3605)(1210)
1
0
1.74
10
6
k-in.
2
2
)(1.74
10
6
)
(1.95
12
11.25)
2
247.84 k
(
P
c
1
s
1.35
(2)(48)
4.16
4.16
0.75
1
2
247.84
d.
Compute the magnified moment:
M
c
(1.0)(126.2)
(1.35)(76.8)
229.9 ft- k
5.
Consider the loading case 0.9D. Analysis results are shown in Figure 11.12.
a.
Are column moments
ACI minimum?
e
min
0.6
(0.03)(12)
0.96 in.
M
2,min
(13.5)(0.96)
12.96 in.- k
1.08 ft- k
OK
Figure 11.12
