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Shear and moment diagram

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Shear and Moment Diagrams

Shear and bending moment diagrams are analytical tools used in structural analyses and structural design to determine the value of shear force and bending moment at different length of an element. Using these diagrams type and size of a member can be determined easily. Another application of shear and moment diagrams is that the deflection can be easily determined using either the moment area method or the conjugate beam method.

Convention

Normal Convention

Normal positive shear force convention (right) and normal bending moment convention (left).
Normal positive shear force convention (right) and normal bending moment convention (left).