Civil Engineering Reference
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F
i g u r e
8.14 Transverse collector force diagrams, diaphragm 1.
Determination of transverse collector/chord forces (see Fig. 8.14):
Force diagrams at grid line 2, starting at grid line D:
F
B
=−
207 840
.( )
=−
8312
lb tension
F
A
=−
8312
+
(
100
+
82 230
. )(
)
=−
2846
lb tension
.
2
F
A
=−
2846
+
(
184 4
.
+
100 10
)(
)
=
0
lb
Therefore the diagram closes.
Force diagrams at grid line 3, starting at grid line D:
F
B
=
(.
56 04
+
157 840
.)()
=
8553 6
.
lb compression
F
A
=
8553 6
.
−
132 230
. ()
=
4587 6
.
lb compression
.
2
F
A
=
4587 6
.
−
(
234 4
.
+
224 2100
. )(
)
=
lb
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