A Case Study on Seismic Response of Buildings with Re Entrant Corners

Abstract

Plan irregular configuration of buildings has been one of the major issues to be addressed, for those located in earthquake prone areas. This paper deals with re-entrant corner irregularity. There have been many researches on buildings with re-entrant corners by considering few standard shapes such as L, H, T shapes and analyzed using linear dynamic analysis. There is a need for extensive study on re-entrant corners using non linear dynamic analysis. The objective of this study is to compare a building containing re-entrant corners with a building of regular plan configuration by performing non linear time history analysis and also to study the behavior of the re-entrant building located in different seismic zones. A regular residential building with re-entrant corners has been chosen. While modeling, the plan area of the re-entrant and the regular building models has been made approximately equal in order to facilitate the comparison. Linear and non linear dynamic analysis has been carried out. The results obtained of both the models have been compared for maximum storey displacement, storey drift, and modal periods. Re-entrant buildings undergo larger displacement when compared with regular buildings. The floor response curves of these structures have been presented to understand the difference in their behavior due to plan irregularity. Also, the performance of the re-entrant building in different seismic zones has been studied. Buildings with re-entrant corner are more vulnerable to seismic damages and are susceptible to earthquakes corresponding to time periods of lower order. Hence, the building plan must be of regular configuration to possess significant seismic resistance.