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Point of contraflexure occur when:

Point of contraflexure occur when: Correct Answer ​bending moment is zero

Explanation:

In a bending beam, a point of contra flexure is a location where the bending moment is zero (changes its sign). In a bending moment diagram, it is the point at which the bending moment curve intersects with the zero line. At the point of contra flexure, the bending moment is zero.

For example:

A propped cantilever beam with uniformly distributed load over the entire span

[ alt="Propped6" src="//storage.googleapis.com/tb-img/production/19/04/Propped6.PNG" style="width: 340px; height: 155px;">

The corresponding BMD is

[ alt="BMDPropped6" src="//storage.googleapis.com/tb-img/production/19/04/BMDPropped6.PNG" style="width: 350px; height: 300px;">

At distance L/4 from the left support, we get point of contra flexure, as there is the change in sign. At that point, Bending moment is zero.

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