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... using equilibrium in a specific cross-section

There are two methods which can be applied. In general, it is advised to first solve for the support reactions and identify zero-force members.

Method of joints

This method investigates free-body-diagrams of individual joints and uses force equilibrium of a particle to solve the section forces. It is treated in chapter 9.3.2 of the book Engineering Mechanics Volume 1 Hartsuijker & Welleman, 2006.

Exercises

Method of sections

This method investigates free-body-diagrams of parts of the structure and uses force and moment equilibrium to solve the section forces. It is treated in chapter 9.3.2 of the book Engineering Mechanics Volume 1 Hartsuijker & Welleman, 2006.

Exercises

General exercises

The following exercises can be made with any method of your liking:

References
  1. Hartsuijker, C., & Welleman, J. W. (2006). Engineering mechanics: Volume 1: Equilibrium. In Engineering Mechanics: Volume 1: Equilibrium. Springer Dordrecht. 10.1007/978-1-4020-5483-9
Activities
... with zero-force members
Activities
Solve section forces frame structures