A Study on Influence of Masonry Infill and Shear Wall on the Seismic Performance of R.C Framed Building

The study presents the procedure for seismic performance estimation of asymmetric R C frame buildings with ground soft storey based on a concept of the capacity spectrum method. Previous recent earthquakes in many parts of India and globe have revealed the issue regarding the vulnerability of existing buildings. The existing building structures which were designed and constructed according to earlier code provisions do not satisfy requirement of current seismic code and design practice. Many reinforced concrete buildings in urban regions lying in active seismic zone may suffer moderate to severe damages during future ground motion. Therefore it is essential to mitigate unacceptable In this study, 3D analytical model of eleven storied buildings have been generated for asymmetric buildings Models and analyzed using structural analysis tool ‘ETABS�. The analytical model of the building includes all important components that influence the mass, strength, stiffness and deformability of the structure. To study the effect of infill and concrete core wall & shear wall at different positions during earthquake, seismic analysis using both linear static, linear dynamic (response spectrum method) as well as non-linear static procedure (pushover) has been performed. It is an attempt to study the performance of multistoried reinforced concrete building frame due to influence/provision of masonry infill’s and shear wall, five (5) building models (11 storey each) with identical building plan and asymmetry in elevation were study and analyzed. The deflections at each storey level has been compared by performing Equivalent static, response spectrum method as well as pushover method has also been performed to determine capacity, demand and performance level of the considered building models. From the below 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. The result reveals that Fundamental natural period decreases when effect of infill wall and concrete core wall is considered. When the effect of infill walls are not considered, the building performance level remains within yield point to immediate occupancy level and when effect of infill walls are considered, the building performance level goes down to ‘D’ level, however, for concrete core wall model it remains within “Life Safety� level.