These walls are similar to solid walls but the thickness of wall at intervals is increased (Fig. 17.2). The thickened portions are called as piers or pilasters. These walls are used for the following purposes:
- To carry concentrated loads from roof or floor beams
- To provide lateral support
- To reduce the slenderness ratio by stiffening the walls.
Figure 17.2 Solid wall with piers
17.2.3 Cavity Wall
Cavity wall consists of two structural leaves separated by an uniform continuous space called cavity. The two leaves are interconnected by metal ties (Fig. 17.3). The provision of cavity forms a barrier against penetration of dampness through the internal wall and also keeps the room cool because of air column in cavity. In such walls, the inner leaf will be of load-bearing and the outer wall carries its weight only. But bending moment is carried by the stiffness of both the leaves.
Figure 17.3 Cavity wall
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