For pure bending, identify the WRONG statement.

Question

Question

This question was previously asked in

JKSSB JE CE 2021 Official Paper Shift 3 (Held on 29 Oct 2021)

Answer 1

Explanation:

Pure bending along the entire beam ⇒ No shear force along the entire beam.

The deflected shape in case of pure bending is circular in shape

Pure bending in same part ⇒ No shear force in some part.

NOTE:

Statement 1 is false, as bending moment is not 0, in case of pure bending, as explained in the solution below.

Case I:

Simply supported beam subjected to equally space downward concentrated loads.

Case II:

SSB subjected to two equally spaced opposite moments.

Zero SF everywhere in beam. So, pure bending in entire length of beam.

Case III:

Cantilever beam subjected to the clockwise moment at the free end.

The bending moment at any cross-section will be equal to that of the moment applied at the free end.

Case IV:

Overhanging beam with both sides overhangs subjected to different concentrates loads at free ends.

∴ Case IV will be true only when P1 = P2.

∴ Case (I), (ii), and (iii) are pure bending cases.