The point of contraflexure is the point at which ___________ changes its sign.
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A.
Torsional moment
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B.
Shear force
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C.
All of the options
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D.
Bending moment
Correct Answer:
D. Bending moment
Explanation:
In structural engineering, the point of contraflexure refers to the specific location along a beam where the bending moment transitions between positive (sagging) and negative (hogging). Because the moment shifts from one direction to another, its mathematical value at this exact point is zero. This point is also frequently called the point of inflection because it marks where the curvature of the beam's elastic curve changes. Identifying these points is critical for designers to determine where to adjust reinforcement or place structural joints.
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