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In a beam subjected to a point load at its midpoint, where does the bending moment change from positive to negative?

20. In a beam subjected to a point load at its midpoint, where does the bending moment change from positive to negative?

1. At the midpoint
2. At a distance equal to one-third of the beam length from each support
3. At the supports
4. At the quarter from each support

Answer

The correct answer is: C) At the supports

Explanation

A simply supported beam is impacted by a reversal of bending stresses when a point load is applied at its midway. At this point, the bending moment at the supports switches from positive to negative.