Civil Engineering Reference
In-Depth Information
P
L
B
h
p
A
C
(
h
e
+
h
p
)/2
b
p
V
e
V
e
b
t
P
e
P
e
FIGURE E5.11
Lattice portal frame.
Example 5.12
The axial forces in cross-braced portal frame members (
Figure E5.12)
are
P
L
(h
e
+
3
h
p
)/
2
−
P
A
=
,
2
h
p
⎛
⎝
⎞
⎠
h
p
+
h
e
+
b
t
+
P
L
b
t
h
p
P
B
=
,
2
h
p
h
e
+
.
h
p
−
P
L
2
h
p
P
C
=
2
Example 5.13
The axial, shear, and bending forces in knee-braced portal frame members
(Figure E5.13)
are
h
p
+
P
L
(h
e
+
h
p
)/
2
b
t
−
2
,
+
d
t
P
A
=−
P
B
=
2
h
p
(b
t
−
d
t
)/
2
2
P
L
A
h
p
D
B
C
(
h
e
+
h
p
)/2
V
e
V
e
b
t
P
e
P
e
FIGURE E5.12
Cross-braced portal frame.
