In the method of sections for truss analysis, the basic principle used is:
Choose the correct answer
Method of joints applied globally
Isolate a portion of the truss by passing a section through not more than 3 members and apply 3 equilibrium equations (sum Fx, sum Fy, sum M = 0) to find forces in the cut members
Assume all members are in compression
Apply consistent deformation conditions
Correct Answer
B. Isolate a portion of the truss by passing a section through not more than 3 members and apply 3 equilibrium equations (sum Fx, sum Fy, sum M = 0) to find forces in the cut members
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Method of sections: pass a cut through maximum 3 members (to have 3 unknowns for 3 equations). Choose moment centre at the intersection of two unknown force lines to solve for the third directly. More efficient than method of joints when specific member forces are needed without solving all joints.
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