SEISMIC RESPONSE OF BUILDINGS WITH RE - ENTRANT CORNERS IN DIFFERENT SEISMIC ZONES

Shreyasvi C, B. Shivakumaraswamy

Abstract: Buildings with re - entrant corner are commonly encountered when there is a scope for maximum utilization of the minimum available space. Also, these buildings respond differently when located in various seismic zones. One of the major problems associated with re - entrant corner is torsion. It also leads to difference in the stress induced in different wings of the building leading to stress concentration at the re - entrant corner. This study focuses on the response of the building with a re - entrant corner located in various seismic zones. The major objective is to study the response of a building in different seismic zones and also, to compare a building containing re - entrant corners with a building of regular plan configuration by performing linear dynamic analysis. A regular residential building with re - entrant corners and with a rectangular plan configuration has been chosen. While modeling, the plan area of both the models has been made approximately equal in order to facilitate comparison. The design spectrum being applied to the building models has been studied in order to understand the seismic demand in different seismic zones. The results obtained are compared for different seismic zones in terms of storey drift, joint displacement, and storey displacement. Along with this, the force to which the column located near a re - entrant corner is subjected is studied. When the re - entrant building was compared with regular building, it was observed that the former undergoes larger storey displacement and drift than the latter. Buildings with re - entrant corner are more vulnerable to seismic damages and are susceptible to earthquake corresponding to time periods of lower order; hence, the building plan must be of regular configuration in order to possess significant seismic resistance.

Keywords: re - entrant corner, response spectrum analysis (RSA), storey drifts, joint displacement.

DOI: https://doi.org/10.15623/ijret.2015.0416011