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Seismic Behaviour of Flat Slab Building Strengthened With Perimeter Beams, Shear Walls and Beam Slab in Alternate Storeys

The common practice of design and construction of buildings is beam-column construction in which slab is supported by beam and beams by column. Nowadays slabs are directly put on the column for increasing the room height, aesthetic beauty; such slabs are called as Flat slabs.In the present study a C shaped building of Flat slab was compared with conventional RCC building at G+3, G+6, and G+ 9 by varying storey heights. Flat slab buildings were strengthened with perimeter beams, shear walls and beam slab at alternate stories. Analysis was done by Linear Static and Response Spectrum analysis in zone V using ETABS software. The parameters such as storey displacement, storey shears, storey drift, storey stiffness were checked after the analysis. Flat slab buildings were also analysed at 20 and 30 storeys to understand at which storey height they are admissible in seismic areas. Based on the study conducted, Flat slab buildings with shear walls were preferred because there is a considerable reduction in storey displacement and storey drift in zone V. Even though Flat slab with drop in place of beam slab arrangements increases maximum displacement values, these all were well within permissible limits up to 20 storeys.