Steel structures generally have relatively flexible joints, so bracing is necessary to increase the stability and lateral strength of the building. Bracing can be applied at the ends and at intervals as shown in the figure.
The bracing structures used are typically tensile types due to their long length. These may include wire ropes or round steel bars, which must be installed taut to function. Therefore, turnbuckles are used to maintain this tension within the structure.
Trusses
In large trusses, meaning those with significant spans and heights, secondary trusses perpendicular to the main trusses may be required. These act as "braces" to the main trusses, increasing roof stability and helping to resist wind loads parallel to the roof ridge.