Steel Buildings in Europe

Part 2: Concept Design 2 - 43 6 BUILT-UP COLUMNS Heavily loaded columns, or columns in tall industrial buildings may be in the form of built-up sections. Built-up columns often comprise HE or UPE sections in which battens (flat plate) or lacing (usually angles) are welded across the flanges, as shown in Figure 6.1. Built-up columns are not used in portal frames, but are often used in buildings supporting heavy cranes. The roof of the structure may be duo-pitch rafters, but is more commonly a truss, as illustrated in Figure 1.4. Figure 6.1 Cross-sections of built-up columns To support the roof above the level of the crane, a single member may project for several meters. This is often known as a “bayonet” column. The projecting member may be a continuation of one of the two primary sections in the built-up section, or may be a separate section located centrally to the built-up section. Examples of built-up columns are shown in Figure 6.2. Buildings that use built-up columns are invariably heavily loaded, and commonly subjected to moving loads from cranes. Such buildings are heavily braced in two orthogonal directions. The detailed design of built-up columns is covered in Single-storey steel buildings. Part 6: Detailed design of built-up columns [4] of this guide.