Elastic Cross Section Properties

An evaluation of the elastic section properties of a cross-section is fundamental to all structural analyses. These encompass a wide range of parameters such as; cross-sectional area, position of the centroid and the elastic neutral axes, the second moment of area about the centroidal axes and any parallel axes and the elastic section modulus, (Note: not the Elastic Modulus of Elasticity which is discussed in Section 2.1). Each of these is discussed separately in Sections 2.2.1 to 2.2.8.

Most structural elements have a cross-section for which standard properties are known, e.g. square, rectangle, triangle, trapezium, circle etc., or comprise a combination of one or more such shapes. If the properties of each shape which makes up a complete cross-section are known, this information can be used to determine the corresponding properties of the composite shape. A number of examples are given to illustrate this in the following sections.

In structural steelwork a variety of hot-rolled standard sections are available, the cross-sectional properties of which are given in published tables. A selection of the most common ones are shown in Figure 2.8.

Equsl (EA)

l.'imcES-hl rkj-ii(LJJi)

ikjiureboUOv fitiioMSHS) Circular followsmwMCHSt

ikjiureboUOv fitiioMSHS) Circular followsmwMCHSt l.'imcES-hl rkj-ii(LJJi)

RfelaJipmlJl holto*' «ilion (KHS)

RfelaJipmlJl holto*' «ilion (KHS)

Figure 2.8

Material and section properties 35

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