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Chapter 6 on trusses in statics covers structures made of straight members connected by pin joints where loads act only at joints and each member is a two-force member in tension or compression. First, support reactions are found using a full free-body diagram and equilibrium equations ΣFx = 0, ΣFy = 0, and ΣM = 0. The two main methods are method of joints and method of sections. The method of joints solves member forces by analyzing one joint at a time, starting where there are at most two unknowns, assuming all unknown forces are in tension and using ΣFx = 0 and ΣFy = 0. The method of sections finds specific member forces by cutting through the truss (no more than three unknown members), isolating one side, and applying ΣFx = 0, ΣFy = 0, and ΣM = 0. Zero-force members can be identified early using standard rules to simplify analysis. Strategy: find reactions first, then zero-force members, then choose joints or sections depending on whether a full sol. or specific forces are needed.
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