Steel Buildings in Europe

Part 2: Concept Design 2 - 16 3 CASE STUDIES ON MULTI-STOREY STEEL BUILDINGS The following case studies describe the us e of steel in m ulti-storey buildings , primarily in the comm ercial building sector, but a lso i n t he r esidential sector, where the same technologies are used. 3.1 Office Building, Bishops Square, London Figure 3.1 Office building, Bishop’s Square, London The Bishop's Square project near to London's Broadgate area com prises a composite steel structure of 18 m s pan and only 650 mm depth. There is an almost fully glazed façade and a 'green' roof space on three levels . The completed building is shown in Fi gure 3.1, and during construction in Figure 3.2. The 12-storey building of close to 80000 m 2 floor area comprised approximately 9500 tonnes of steelwork, and was erected in only 30 weeks out of an overall 20 month construction programme. Fire protection, in the form of intumescent coatings, was applied o ff-site in a si ngle operation by the steelwork contractor, which speeded up the following trades. The highly glazed façade was designed to satisfy onerous thermal requirements which led to the use of triple glazing w ith integral louvres. Photovoltaic panels were installed on the roof to provide an energy source for lighting, thereby reducing running costs and CO 2 emissions.