Seismic Performance Study of R.C. Buildings having Plan Irregularity using Pushover Analysis

The past earthquakes in which many reinforced concrete structures were severely damaged have indicated the need for evaluating the seismic adequacy of buildings. In particular, the seismic rehabilitation of older concrete structures in high seismicity areas is a matter of growing concern and an acceptable level of safety must be established. To make such an assessment, simplified linear-elastic methods are not adequate. Thus here we carried out the project using non-linear elastic method called as Pushover analysis which helps to assess the damage vulnerability of buildings. Earthquakes are most devastating natural hazards in terms of life and property of any region. The behavior of the structure greatly depends on size, shape and geometry of that structure i.e, vertical and horizontal irregularities and path of load transferring to the supporting ground. Irregularity in building attracts forces which lead to stress concentration at the point of irregularity; subsequently it leads to localized failure of that structure. The present study focuses on seismic performance of irregular RC models having irregularities i.e. plan re-entrant corner irregularity. For this purpose ETABS a finite element software has been used. Here 3-D RC models are modeled and analyzed for seismic zones IV and V. Roof displacement; Base shear carried; performance points; number of hinges formed are the parameters used to quantify the performance of the structure.