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a
a b
b
Fig. 1-70. Fig. 1-71.
whereas if it tends to shorten the member, it is a compressive force
(C), Fig. 1-71,b. In the actual design of a truss it is important to state
whether the nature of the force is tensile or compressive. Often,
compression members must be made thicker than tension members
because of the buckling or column effect that occurs when a member
is in compression.
Fig. 1-72. Fig. 1-73.
87
