The point of contraflexure in a beam is defined as the point where the:
ADeflection is zero
BBending moment is maximum
CShear force is maximum
DBending moment changes sign (becomes zero)
Explanation
A point of contraflexure (or point of inflection) occurs along a flexural member where the bending moment diagram changes algebraic sign (passes through zero), causing curvature to switch between sagging and hogging.
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