Civil Engineering Reference
In-Depth Information
1
U1
27.25'
L1
L2
1
8 @ 19.55' = 156.38'
Member L1-L2
+0.63
+0.54
FIGURE E5.5c
1
U1
27.25'
L1
L2
1
8 @ 19.55' = 156.38'
-0.15
Member U1-L2
+0.93
FIGURE E5.5d
In Figure E5.5e: with unit load at L3 and taking moments about U3, the
force in L3-L4
=[
(
3
/
8
)(
5
)(
19.55
)
]
/
27.25
=+
1.35 (tension direction to balance
reaction moment about U1).
In
Figure E5.5e:
with unit load at L4 and taking moments about U3, the force
in L3-L4
=[
(
4
/
8
)(
5
)(
19.55
)
−
(
1
)(
19.55
)
]
/
27.25
=+
1.08 (tension direction to
balance reaction moment about U1).
Section 3-3 may be isolated to determine the forces in member U3-L3
In Figure E5.5f: with unit load at L3 and summing vertical forces in panel
3-4, the force in U3-L3
0.38.
In Figure E5.5f: with unit load at L4 and summing vertical forces in panel
3-4, the force in U3-L3
=+
3
/
8
=+
=+
1
/
2
−
1
=−
0.50.
