SEISMIC ANALYSIS OF PLAN IRREGULAR BUILDINGS

Abstract

This analysis aims to the seismic response of various vertical irregularity structures. The project is done by Response spectrum analysis (RSA) of vertically irregular RC building. This study includes the modelling of regular and H-shape plan irregular building having area of 20X15m and height of 3.2 m from each except ground floor for G+7 storey .The performance of this framed building during study earthquake motions depends on the distribution of stiffness, strength, and mass in both the horizontal and vertical planes of the building. The main aim of this work is comparative study of the stiffness of the structure by considering the three models in Regular Structure and three models in Plan irregular structure with different Vertical irregular structure. All models are analysedwith dynamic earthquake loading for the Zones V .Result found from the response spectrum analysis that in irregular shaped building displacements are more than that of regular shaped building. All building frames are modelled & analysed in software Staad.Pro V8i. Various seismic responses like base shear, frequency, node displacement, etc. are obtained. The overall performance of regular building is found better than irregular building .The seismic performance of multistory regular building is determined by Response Spectrum analysis in STAAD Pro. Software