
32 Forensic Engineering Fundamentals
us, since the reaction at point A is known, the force in member AB can be computed.
Summing forces in the x-direction provides the force in member AC:
FFF
xACAB
=− =
0: cosθ 0
(2.42)
As shown, member AB is in compression and member AC is in tension. Moving to
joint C, the following free-body diagram can be drawn as in Figure 2.19.
Summing forces in the x- and y-directions yields the following relationships:
FFFFF
xCECDACCB
=− −+ =
0: co
os
0
(2.43)
FF
yCBCD
=−
=
0:sin sinϕβ/
(2.44)
e initial diagram shows the forces in members CB and CD directed down. Given the
equation for summing forces in the y-direct