1. ENGR 220 Section 6.1~6.2
BENDING

2. Internal Forces

3. Method of Sections

4. Internal Forces in 2-D

5. 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.

10. Graphical Method for Shear and Bending Moment Diagrams

11. 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

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

15. 7-87: Draw the shear and loading diagrams