In plastic analysis of a beam, a plastic hinge forms when the section moment reaches the
Correct answer: D. Fully plastic moment
- A. First cracking moment
- B. Yield moment of the outer fibre
- C. Elastic buckling moment
- D. Fully plastic moment
Explanation
A plastic hinge forms when the entire cross section has reached its yield stress distribution, corresponding to the fully plastic moment. The yield moment marks first yielding at an extreme fibre, but the section can still carry additional moment before becoming fully plastic.
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Structural analysis determines how beams, frames, trusses and arches carry loads through reactions, shear forces, bending moments, axial forces and deflections. It covers free-body diagrams, equilibrium equations, determinacy, influence lines and methods such as slope deflection, moment distribution and virtual work, while distinguishing analysis of a structure from its design.
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