Beams — Lesson 1

This lesson covers the concept of one-dimensional structural systems, focusing on axial members and their behavior under different forces and moments. It explains how to draw a line diagram of a one-dimensional member and how to identify the internal forces acting on it. The lesson further discusses the types of forces that can be revealed when sectioning a member, including axial, shear, and moment forces. It also introduces the concept of straight members, which unlike axial members, can be subjected to moments and forces in between, apart from forces at the ends. The lesson concludes with a detailed explanation of how to calculate and represent the variation of shear force and bending moment in a beam.

Video Highlights

00:05 - Introduction to one-dimensional structural systems and axial members
1:00 - Understanding the types of forces revealed when sectioning a member
03:23 - Introduction to straight members and their characteristics
09:29 - Calculating and representing the variation of shear force in a beam
33:03 - Calculating and representing the variation of bending moment in a beam

Key Takeaways

- One-dimensional structural systems, particularly axial members, can be represented as line diagrams for simplicity.
- Sectioning a member can reveal the internal forces acting on it, including axial, shear, and moment forces.
- Straight members, unlike axial members, can be subjected to moments and forces in between, apart from forces at the ends.
- The variation of shear force and bending moment in a beam can be calculated and represented graphically, providing valuable insights for structural design.