Shape and positioning of members in a steel roof truss are designed in such a way that the members are subjected to either compression or tension. Trusses do not have any bending stress in them. The compression members of the truss are based on the span, slope, the covering material, and centre to centre of trusses. The various types of roof trusses are discussed in Section 24.5. For large spans steel trusses are generally preferred. This also can be used for small spans.
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