Composite trusses

Lattice girders or trusses22 are frequently used in multi-storey buildings and are the most appropriate for spans in excess of 15 m, where the truss is designed to occupy the full depth of the floor and service zone. A high degree of service integration is provided, as shown in Figure 4.10(f). The fabrication and fire protection costs are relatively high, but composite trusses can be cost effective. Some diagonal members may be replaced by vertical members at mid-span so creating a Vierendeel girder to permit the passage of larger services. Trusses can be designed using either CHS or RHS sections in longspan applications. Alternatively, Tee sections may be used as chords, and single or double angles for the diagonal members in mediumspan applications.

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