Behaviour of Irregular Reinforced Concrete Frames under Seismic Loading

Abstract

The present world demands the multi storey buildings due to lack of space availability in the urban areas to accommodate the increased population with their proposed requirements. Multi-storey building’s behaviour during high seismic action depends mainly on Structural configuration. Structural configuration having any discontinuities in plan or in elevation are termed as building with irregularities. When these irregularities are present in the structure, buildings suffer much more damage during strong earthquake excitations which was recorded in the past. The Irregularities are defined as per IS:1893 (Part 1)-2016 code. This paper is concerned about the various types of plan, vertical and combined irregularities and their effect under seismic loading. The objective of the present study is doing linear static and dynamic analysis i.e., ESA and RSA on various irregular building frames and calculating their response using some seismic parameters like displacement response, storey drift, inter storey drift ratio and base shear for which the frames are designed using IS 456-2000 and special detailing for fulfilling the ductility requirement is done as per IS: 13920-2016. Comparison of the results of analysis in X and Y directions of irregular structures is done with regular structure. The scope of the present study also includes the maximum and minimum effect on the various types of irregular structures under seismic loading and to know if the presence of irregularities always amplifies the response or not.