SESIMIC EVALUATION OF UNSYMMETRICAL MULTI-STOREY BUILDINGS WITH AND WITHOUT FLOATING COLUMNS BY STAAD PRO

In present scenario, multi-storey buildings in urban area are required to have column free space due to shortage of space, population and also for aesthetic and functional requirements. For this purpose buildings are provided with floating columns at one or more storey. These floating columns are highly disadvantageous in a building built in seismically active areas. The earthquake forces that are developed at different floor levels in a building need to be carried down along the height to the ground by the shortest path. Deviation or discontinuity in this load transfer path results in poor performance of the building. The object of present work is to study the behaviour of unsymmetrical multi-storey building with and without floating columns under seismic forces. For this purpose P+3 storey and P+20 storey building are considered and analyzed for seismic zone III and seismic zone V and for soil Type I, Type II and Type III by using software STAAD Pro. Present work provides the good information on the parameters base shear and storey drift in the multi-storey building.