Analysis of Trusses (continued)
Recommended strategy: Assume each truss member is in tension when
constructing your free body diagram. Then when the resulting force from the
equilibrium equations comes out negative, that means that the truss element is
actually in compression.
Also take advantage by identifying “zero force” truss members.
In the figure below truss members AB, BC, and BD are connected by a
smooth pin at B.
Note: The force in member BD must be zero for any angle θ other than
zero since equilibrium in the y-direction must be satisfied.
i.e. ∑ Fy = 0
Click here for an example using the method of joints.
Click here for an example using the method of sections.
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Copyright © 2019 Richard C. Coddington All rights reserved.