Civil Engineering Reference
In-Depth Information
F
i g u r e
12.8 Roof collector force diagrams.
Forces along grid line F:
(.
67 52
+
27 11
.
)(.
+
55 22
+
39 41
.
)
()
ompression
F
2
=
8
=
757 48
.
lb c
F
2
(.
61 75
−
55 22
.
)(.
+
63 68
−
57 15
.
F
4F
=
757 48
.
−
(
116
)
=
0
lb
2
Therefore all the force diagrams close to zero.
Second-floor diaphragm (see Fig. 12.9):
The uniform load applied to the second-floor
diaphragm is 250 plf. The presence of the interior shear wall at grid line 3 creates two
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