Steel Buildings in Europe

Part 2: Concept Design 2 - 22 Alternatively, gable frames can be constructed from columns and short rafters, simply supported between the columns as shown in Figure 3.5. In this case, gable bracing is required, as shown in the figure. Figure 3.5 Gable frame (not a portal frame) 3.2 Frame stability In-plane stability is provided by frame continuity. In the longitudinal direction, stability is provided by vertical bracing in the elevations. The vertical bracing may be at both ends of the building, or in one bay only. Each frame is connected to the vertical bracing by a hot-rolled member at eaves level. A typical bracing arrangement is shown in Figure 3.6. 1 2 2 3 1 Vertical bracing in the gable 2 Vertical bracing in the walls 3 Roof bracing Figure 3.6 Typical bracing in a portal frame The gable columns span between the base and the rafter, where the reaction is carried by bracing in the plane of the roof, back to the eaves level, and to the foundations by the vertical bracing.