Civil Engineering Reference
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F
i g u r e
12.12 Floor collector force diagrams.
Determine the longitudinal collector/strut forces along grid lines D and E (see Fig. 12.12):
Forces along grid line D starting at grid line 1:
66 45
.
+
91 45
.
F
2
=−
()
8
=−
631 6
.
lb tension
D
2
(.
71 36041 0414954
2
−
.
)(.
+
−
.
F
4
=−
631 6
.
+
()
58
=
0
lb
D
Forces along grid line E starting at grid line 1:
(.
66 45
+
76 58
.
)(.
+
91 45
+
51 58
.
compression
F
2F
=
()
8
=
1144 24
.
lb
2
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