Steel columns of simple type comprises of a single RSJ or a RSJ with two flange plates (Fig. 24.13). Compound columns may be made by riveting together two or three RSJs (Fig. 24.14). Other forms of compound columns commonly used are a combination of RSJs and channels or two angles, channels with flange plates or four angles and a web plate or four angles joined together with lattice braces (Fig. 24.15).
Figure 24.13 Simple type of column
Figure 24.14 Compound column
Figure 24.15 Other types of compound column
Whenever more than one member is joined it is necessary to interconnect them with the help of lacings and batten plates. This arrangement of lacings makes the column to act as a combined unit (Fig. 24.16).
Figure 24.16 Types of lacings for columns
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