Part 1: Architect’s Guide 1 - 7 Depending on the load-bearing structure of the extension, and in the case of a reinforced concrete building whose width is not altered, the steel frame may, for the most part, be installed on the external concrete walls or columns, or even fixed to the external walls of the façades on each floor, in order to distribute the load. Both solutions avoid having to create a new structure across different levels or new foundations that are costly and difficult to build. 2.4.2 Extending width of buildings When conditions are right for the restructuring of an existing building, the steel structure also offers an effective functional solution for extending its width. Figure 2.5 Extension of a multi-storey building A number of technical solutions are possible, depending on the structural characteristics of the building and the planning regulations applicable in that area: Frames installed parallel to the building Half portal frames supported on a parallel row of foundations separate from the building, depending on the project, and on the load-bearing structure of the building Hangers fixed to the beams on the building super structure. The steel structure of the extension is mechanically fixed to the building floors and load-bearing plates. 2.4.3 Conversion and refurbishment of industrial buildings Refurbishment and conversion is estimated to account for about 50% of building work. Structures made of steel frames lend themselves particularly well to such alterations. Many conversions involve nineteenth century buildings made of steel, such as stations, market halls and industrial workshops that are found in dense urban areas.
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