Explain the Shear or Moment Diagrams

• Shear diagram changes by magnitude of the load.
• Shear is constant along unloaded portions of a beam
• For a point load, the shear function is constant. For a uniform load, the shear function is linear.
• For a constant shear, the moment function is linear.
• For a liner shear, the moment a second-degree curve.
• The change in moment = area under the shear diagram
• Max/min moment occurs at zero shear.

• An applied moment at a given location has NO affect on the shear diagram-only the moment diagram.

Shear/moment diagrams

dV/dx = - w(x)