Steel Buildings in Europe

Part 4: Detailed Design of Portal Frames 4 - 43 An eaves strut may be required in the end bays, depending on the configuration of the plan bracing (see Section 9.3.2). 1 2 1 Eaves level 2 Position of plan bracing Figure 9.1 Single diagonal bracing for low rise frames 1 2 1 Eaves level 2 Position of plan bracing Figure 9.2 K bracing arrangement for taller frames 9.2.3 Bracing using angle sections or flats Cross braced angles or flats (within a masonry cavity wall) may be used as bracing (as shown in Figure 9.3). In this case, it is assumed that only the diagonal members in tension are effective. 1 2 1 Eaves level 2 Position of plan bracing Figure 9.3 Typical cross bracing system using angles or flats as tension members 9.2.4 Bracing in a single bay For vertical bracing provided in a single bay, an eaves strut is required to transmit wind forces from the roof bracing into the vertical bracing (Figure 9.4). Further details of eaves struts are given in Section 12.2.