26th November 2019

11

# What is the formula for bending moment?

Below are simple instructions on how to calculate the bending moment diagram of a simple supported beam. It is calculated as the perpendicular force multiplied by the distance from the point. A Bending Moment is simply the bend that occurs in a beam due to a moment.

Consequently, do bending moment diagrams have to end at zero?

The bending moment at any point along the beam is equal to the area under the shear force diagram up to that point. (Note: For a simply-supported beam, the bending moment at the ends will always be equal to zero.)

What is negative bending moment?

Usually 1. Bending Moments (BM) that cause sagging is called positive BM, and that which cause hogging is called negative BM. 2. PBM causes top fibres of beam to undergo compression, NBM causes top fibres to undergo tension.

Where is the bending moment zero?

Shear, being zero means that the forces are either zero or cancelling each other. That gives us bending moment at constant, since it is the product of force with distance. Alternatively, shear is the rate of change of bending moment. So zero rate of change means it is either constant or at the peak value.