STEEL ROOF STRUCTURE

Introduction

A truss, or lattice structure, is a structural assembly of small interconnected elements.

Analysis

Structural analysis uses the concept of resolving forces, which can be analytically or graphically.

Bracing

Roof bracing is often necessary to provide stability.

Estimating sizes

There is considerable design flexibility for roof trusses, but simple rules can be used as initial guidelines.

Graphical method

The same analysis can be performed graphically, with forces represented by lines drawn to scale in the same direction as the corresponding forces.

Joints

The traditional bolted joint has generally been replaced by welding.

Member configuration and shape

Trusses can be designed to suit a wide range of requirements.

Practical considerations

Real circumstances are generally different from the idealised conditions assumed in the analysis of trusses.

Services

Trusses offer effective routes for distributing services.

Vierendeel girders

Trusses can have a rectangular configuration, avoiding the potential intrusion of diagonal members, if the joints are rigid.