In plastic analysis using the mechanism method, the collapse load is determined by:
Choose the correct answer
Virtual work principle equating external virtual work to internal plastic hinge work
Limit equilibrium at one critical section
Maximum elastic stress approach
Stiffness matrix approach
Correct Answer
A. Virtual work principle equating external virtual work to internal plastic hinge work
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In the mechanism method: W × δ = Σ(M_p × θ_hinge), where the external virtual work equals the sum of plastic moment times rotation at each hinge in the mechanism.
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