Seismic analysis of plan irregular RC building frames

Abstract

The presence of irregularity in buildings is a matter of concern when it is subjected to devastating earthquakes. A sudden change in vertical or plan configuration in buildings tends to weaken the structure. To prevent failure and minimize the hazard potential of irregular buildings, the responses of such buildings to lateral loads have to be studied in detail. In this paper, the responses of irregular buildings are analyzed using Pushover analysis. 10 re-entrant corner models are analyzed to study their effect as per IS 1893 (Part 1): 2016 codal provisions. The analytical tools used include ETABS v 16.2.0 software and SeismoMatch 2018 software. The parameters considered in this study are storey displacement, stress concentration and performance levels. Strengthening techniques to strengthen vulnerable models are also discussed. The results obtained are compared with that of a regular structure.