ENGR 220 Section 6.1~6.2 BENDING

Internal Forces

Method of Sections

Internal Forces in 2-D

Shear and Moment Diagrams For beams we can calculate the shear and moment diagrams as a function of position along the beam. Internal normal force will not be considered in that most loadings are vertical on a beam and were are primarily concerned about shear and bending failures.

Graphical Method for Shear and Bending Moment Diagrams

Sign Convention Shear ~ positive direction is denoted by an internal force that causes a clockwise rotation on which it acts. Moment ~ positive direction is denoted by and internal moment that causes a compression or pushing on the upper part of the member

Graph the internal forces shear force and bending moment along the axis of the beam.

7-87: Draw the shear and loading diagrams