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.