Seismic behaviour of high rise re-entrant corner (t-shape) rc building with different lateral load resisting systems

The behaviour of buildings during strong seismic waves will depend on the overall shape, size and geometry of the building. In general, building with simple geometry in plan will perform well during strong earthquake motions as compared to complex geometry building with re-entrant corners. To overcome the deficiency of re-entrant shaped corners building (T), the lateral force resisting systems called shear wall, braced frame and in-filled frame are provided to the re-entrant shaped corner building (T) to reduce the damage due to seismic waves. Most of the high-rise buildings in India consist of flexure resisting frames with brick infill. But the brick in-fill is considered to be non-structural element and therefore all the lateral loads are assumed to be resisted by the frame itself. Compared to reinforced concrete frame, a brick infill is brittle and this fails during an earthquake. The lateral failure of the structure can be controlled by using masonry infill such as shear wall, strut and bracings. In the present study, G+ 28 storey building on medium type soil is considered in seismic zones II, III, IV and V for the analysis. In total, four models are used for the analysis using structural software package ETABS 2013.The response parameters of four models such as Base shear, Mode period, Storey displacement and Storey accelerations are studied. Their comparisons are made with both the methods of Equivalent static lateral force and response spectrum.