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In the analysis of beams subjected to loads, the point with Nil Bending Moment can be a 1. Point of Contra flexure 2. Point of Maximum Shear Force 3. Point of Inflection Which of the above statements is/are correct?

In the analysis of beams subjected to loads, the point with Nil Bending Moment can be a 1. Point of Contra flexure 2. Point of Maximum Shear Force 3. Point of Inflection Which of the above statements is/are correct? Correct Answer 1, 2, 3

Concept:

Point of ContraflextureThis is the where bending moment changes its sign.

Knowing the place of the contraflexure is especially useful when designing reinforced concrete or structural steel beams and also for designing bridges.

Flexural reinforcement may be reduced at this point. However, to omit reinforcement at the point of contra flexure entirely is inadvisable as the actual location is unlikely to realistically be defined with confidence. Additionally, an adequate quantity of reinforcement should extend beyond the point of contraflexure to develop bond strength and to facilitate shear force transfer.

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Point of Inflection-This is the point on the deflected shape where the curve changes being concave to convex or vice versa. The bending moment can be zero at the point of inflection.

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At the Point of Maximum Shear Force, the bending moment may have zero value. But it is not always true.

So. The question is asking the point where BM "Can"  be 0, By the above diagrams, it is clear that BM is 0 in at least some or all conditions. So, all the statements are correct.

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