Seismic response of RC framed irregular structures

Abstract

Earthquakes are one of the most unpredictable and deadliest of all-natural disasters; nevertheless, because of their unpredictable character, it is difficult to prevent human deaths and property loss if structures are not designed to withstand earthquake forces. A structure can be classified as irregular if it has an irregular distribution of stiffness, mass, and strength, or because of an irregular geometric configuration. However, previous earthquake records suggest that these constructions have a poor seismic performance. In the present research study, effects of irregularities are compared with regular buildings of different stories in seismic zones II & IV. Irregular buildings with mass irregularity, stiffness irregularity, geometry vertical, and plan irregularity are considered in the present paper. Earthquake analysis is carried out by using linear dynamic analysis i.e. Response Spectrum method. The parameters considered being story lateral loads, story displacement, story drifts, story shear, and story stiffness using ETABS. As a result of the analysis, Story lateral loads, Story shear and Story stiffness were observed to be maximum in regular buildings as compared to irregular buildings. The story displacement and story drifts are maximum in the irregular building as compared to regular buildings. Response spectrum curves are drawn for regular and irregular buildings and concluded that accelerations are greater in zone IV than zone II.0.