Steel Buildings in Europe

Part 8: Building Envelope 8 - 30 1 2 3 4 5 1 Eaves beam 2 Main column 3 Tension wire 4 Anti sag bar (section or tube) 5 Side rail Figure 4.9 Cleat supporting a purlin using a bolted connection 1 2 1 Purlin 2 Cleat Figure 4.10 Side rail support for wall cladding 4.2 Loading The purlins and cladding rails need to be designed to carry all of the loads applied to them from the cladding and to transfer these loads into the structural frame. These loads will include the permanent actions due to the weight of the cladding and secondary steelwork together with the variable actions described in Section 3.7.1. It will usually be acceptable to consider these actions as acting uniformly over the purlins, but account must be taken of high local forces such as the wind suction forces close to the edges of the building. In addition to the cladding loads, the purlins may also be required to support the weight of