Question

The bending moment at supports in case of simple supported beams of length (L) and carrying a point load W in the mid-span of the beam is always:

• A. $W L / 4$
• B. $W L^2 / 8$
• C. Zero
• D. $W / L$

Hint:

For simply supported beams: - Bending moment is always zero at supports. - Maximum bending moment occurs at the point of load application.

Answer 1

The Correct Option is C

For a simply supported beam with a point load W at its mid-span, the reaction forces at the supports create no bending moment at the supports. The bending moment is maximum at the center of the beam, where the load is applied, and zero at the supports.
Key moments for the beam:
• Maximum bending moment at mid-span: W L/4,
• Bending moment at supports: 0.