Civil Engineering Reference
In-Depth Information
F
i g u r e
3.39 Transverse strut/chord force diagrams.
The force diagram closes.
Forces along grid line 3: At grid line 3 (above C),
F
3
=
(
145 92036
.
+
)(
)
=
5972 4
.
lb compression
C
At grid line 3 (above C),
F
3
=
(
446 72014
.
-
)(
)
=
5973 8
.
lb compression
C
The force diagram closes.
Forces along grid line 4: At grid line 4 (above B),
F
4
=
(
420
-
60 30
)()
=
10 800
,
lb tension
B
At grid line 4 (above B),
F
4
=
(
480
+
60 20
)()
=
10 800
,
lb tension
B
The force diagram closes.
Forces along grid line 5: At grid line 5 (above B),
F
5
=
480 30
()
=
14 400
,
lb compression
B
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