Design of Steel Structures, 3rd Edition by Pearson

Design of Rafter Bracing

This bracing is provided to transmit horizontal wind forces acting in the longitudinal direction of the building to the vertical bracing in the walls. Purlins are not generally designed to resist axial forces due to wind load longitudinal direction of the building. As shown in Figure 13.89, the rafter bracing is generally provided in both end bays of the building.

When wind acts in the longitudinal direction of the building (θ = 90°) with internal suction, the pressure coefficients are obtained from Table 13.4 and they are shown in Figure 13.90.

Figure 13.89

Figure 13.90

As shown in Figure 13.91, wind forces ...