STEEL

ROOF

TRUSSES

TRUSS..

A truss is a structure comprising five or more triangular units constructed with straight

members whose ends are connected at joints referred to as nodes.

trusses mainly consist of three elements:

1. Rafters to support the roofing material

2. Purlins to provide intermediate support to rafters and

3. Trusses to provide to the ends of purlins.

The various types of trusses in use are:

King post truss Queen post truss Combination of king post and queen post trusses. Mansard truss Truncated truss Bel-fast truss Steel trusses Composite trusses

Steel roof trusses are for lager span as compared to wooden trusses.

Steel roof trusses are mainly fabricated with angle sections.

The angle sections are jointed together by rivets , welding or nuts and bolts.

Gusset plates are also used in connections.

Recently gusset plates are replaced by welding the members directly.