Question

What does the influence line for Bending Moment indicate?
A. Bending moment at any section on the structure for a given positions of load
B. Bending moment at a given section for any position of a point load

• A. Only A
• B. Both A and B
• C. Only B
• D. Neither A nor B

Answer 1

The correct option is C Only B

Influence line for bending moment indicates bending moment at a given section for any position of a point load.
Note:

• An influence line represents the variation of either the reaction, shear, moments & deflection at a specified point in a member as a concentrated unit force moves over the member.
• Influence lines represent the effect of a moving load only at a specified point on a member, whereas shear & moment diagram represents the effect of fixed load (or a given position of load) at all points along the member.