Shear Centre — Lesson 2

This lesson covers the concept of the shear centre of a section, a crucial aspect in the bending of beams. It explains how beams can be made up of cross sections of various types such as I type, C type, and L type. The lesson further delves into the effects of shear force on these sections, the distribution of shear stress, and how it changes with the distance from the centre. It also discusses the concept of shear centre, a point in a cross section where if the plane of loading passes through, there won't be any rotation of the cross section. The lesson concludes with practical demonstrations and problem-solving examples to solidify the understanding of the concept.

Video Highlights

00:09 - Introduction to the concept of shear centre of a section and its importance in connection with bending of beams
06:35 - Discussion on the concept of shear centre and its importance in preventing rotation of the cross section.
12:17 - Explanation of how to calculate the location of the shear centre for a cross section with one axis of symmetry
21:03 - Detailed walkthrough of example problems to illustrate the calculation of the shear centre for different cross sections.
47:56 - Explanation of how the location of the shear centre is influenced by the orientation of the external load.
50:39. - Demonstration of how the shear centre is determined for an L section.

Key Takeaways

- The shear centre of a section is a crucial aspect in the bending of beams.
- Beams can be made up of cross sections of various types such as I type, C type, and L type.
- The shear stresses change with the distance from the centre and are maximum near the centre.
- The shear centre is a point in a cross section where if the plane of loading passes through, there won't be any rotation of the cross section.
- Practical demonstrations and problem-solving examples help in understanding the concept better.