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For the
72-bar truss shown below, determine the displacements and elemental stresses.
Nodes 1, 2, 3, and 4 are pin connections. Let E = 107
psi
and the A = 1.0 in2 for the first two stories and A =
0.5 in2 for the top two stories. Table 3 lists the values and
directions of the two loads cases applied to the 72-bar space truss.
Table 3. Multiple Loading Conditions for
the 72-Bar Truss
|
Case |
Node |
Fx
(kip) |
Fy
(kip) |
Fz
(kip) |
|
1
|
17 |
0.0 |
0.0 |
-5.0 |
|
18 |
0.0 |
0.0 |
-5.0 |
|
19 |
0.0 |
0.0 |
-5.0 |
|
20 |
0.0 |
0.0 |
-5.0 |
|
2 |
17 |
5.0 |
5.0 |
-5.0 |
|
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