Civil Engineering Reference
In-Depth Information
11.5
The tied column shown is to be used in a braced frame. It is bent about its
y
axis with the factored moments
shown, and
u
is 16 ft. If
k
1.0,
f
y
60,000 psi, and
c
f
4000 psi, select the reinforcing required. Assume
P
D
50 k.
(
One ans.
6 #7)
11.6
Repeat Problem 11.5 with
EI
based on the bar sizes given as the answer for that problem.
11.7
Repeat Problem 11.5 if the column is bent in reverse curvature and its length is 20 ft. Use 2nd
EI
expression. (
One
ans.
6 #6)
For Problems
11.8
to
11.12
and the braced tied columns given, select reinforcing bars if the distance from the column
edge to the c.g. of the bars is 2.5 in.
f
y
60 ksi and
c
f
4 ksi for all problems. Place bars in two faces only.
Column
Not
Problem
size
b
d
factored
Factored
Factored
No.
(in.)
u
(ft)
k
P
u
(k)
P
D
(k)
M
1
b
(ft-k)
M
2b
(ft-k)
Curvature
14
14
11.8
12
1.0
300
100
80
90
Single
11.9
16
16
16
1.0
500
120
100
120
Double
(
One ans.
6 #9)
14
18
11.10
14
0.85
250
30
90
100
Single
11.11
12
20
16
0.80
500
120
80
100
Single
(
One ans.
6 #9)
15
18
11.12
18
0.90
500
140
110
120
Double
