Nemetschek Engineering User Contest 2009 • Category 2: CAE Housing & Buildings 99 2 grade in the columns is C40/50 from foundation to second floor and then reduced to C28/35 from second floor to roof. Stability is achieved using RC shear walls with thicknesses of 400 mm and 250 mm, some of which are reduced in width further up the building. The Crowne Plaza Hotel building is 10 storeys high and is constructed in both reinforced concrete and steelwork. The construction heights differ from the apartments due to the different requirements for occupancy. The construction height between ground and third floors are 4.6 m, 3.5 m and 3.5 m respectively. Floor to floor heights are then 3 metres from third floor to roof. Slabs are again typically 275 mm thick, supported on RC columns and walls. Stability is achieved using RC shear walls of 400 mm and 250 mm in thickness, again some of which are reduced further up the height of the building. The concrete grade in the columns is C40/50 from foundation to first floor, which is then reduced to C28/35 above first floor. There are RC downstand beams required in the slabs from first to third floor at the interface between the concrete and steel frames. A steel frame was required for three stories at the front of the building to form the entrance foyer and function rooms. The long clear spans required led to the use of cellular steel beams. The steel frame is supported on the RC podium slab at ground floor. Slabs for both the apartment and hotel buildings were modelled using ESA-Prima Win. Loadings for each slab were selected from British Standard BS 6399, and all concrete elements have been designed to BS 8110. This software was useful at evaluating the ultimate and serviceability state design requirements as well as producing the reinforcement requirements. Due to the nature of this design and build contract, the design was continually developing during construction so the software was very easy to amend models with regards to, for example, additional slab openings or loadings. Punching shear and moment transfer checks were carried out on all slabs by extracting the column loads and moments from the model and using both spreadsheets and hand calculations. Crowne Plaza Hotel and Apartment complex
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