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The Finite Element Method, 2nd Edition by S. Quek, G.R. Liu

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Chapter 4

FEM for Trusses

4.1 Introduction

A truss is one of the simplest and most widely used structural members. It is a straight bar that is designed to take only axial forces, and therefore deforms only along its axial direction. An example of a structure consisting of an assemblage of trusses can be seen in Figure 2.7. The cross-section of the truss can be arbitrary, but the dimensions of the cross-section should be much smaller than that in the axial direction—a characteristic of a truss or bar structure.

Finite element equations for such truss members will be developed in this chapter. The one-dimensional element developed is commonly known as the truss element or bar element. Such elements are applicable for analysis of skeletal-type truss ...

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