A point of contraflexure in a beam is a location where the
Correct answer: A. Bending moment changes sign
- A. Bending moment changes sign
- B. Shear force becomes permanently zero
- C. Deflection reaches its maximum value
- D. Slope remains constant over the span
Explanation
At a point of contraflexure, the bending moment changes from sagging to hogging or vice versa. The bending moment is zero at that location, but zero moment alone does not always establish a sign change.
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About Structural Analysis
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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