Seismic Evaluation of Multistorey Building with the Effect of Ground Soft Storey

Generally RC framed structures are designed without regards to structural action of masonry infill walls present. Masonry infill walls are widely used as partitions. These buildings are generally designed as framed structures without regard to structural action of masonry infill walls. They are considered as non- structural elements. This research deals with multistoried buildings with open (soft) ground floor are inherently vulnerable to collapse due to earthquake load, their construction is still widespread in the developing nations. In this study, 3D analytical model of twelve storeyed buildings have been generated for different buildings Models and analyzed using structural analysis tool 'ETABS'. To study the effect of infill, ground soft, bare frame and models with ground soft having concrete core wall and shear walls and concrete bracings at different positions during earthquake, seismic analysis using both linear static, linear dynamic (response spectrum method) as well as non-linear static (pushover) has been performed. The deflections at each storey level have been compared by performing equivalent static, response spectrum method as well as pushover method. Pushover analysis has also been performed to determine capacity, demand and performance level of the considered building models. From the above studies it has been observed that non-linear pushover analysis provide good estimate of global as well as local inelastic deformation demands and also reveals design weakness that may remain hidden in an elastic analysis and also the performance level of the structure. Models with shear wall and concrete bracings are showing efficient performance during Sever Earthquake loading.