COMPARATIVE STUDY ON MASS REGULAR AND MASS IRREGULAR BUILDING SUBJECTED TO SEISMIC LOAD USING PUSHOVER ANALYSIS

B G Naresh Kumar, T M Prakash, Punith N, Arunkumar G N

Abstract: Earthquakes are the most devastating natural hazards in terms of life and property loss of any region. About 60% of the land area of our country is likely to damaging levels of seismic hazard. The response of the structure during earthquake greatly depends on the discontinuity in mass, stiffness and geometry of the structure. Vertical irregularities are one of the major reasons for failure of structures during earthquake. As the world move to the accomplishment of performance based engineering philosophies in seismic design procedure requires, structural engineers to perform both static and dynamic analysis for the design of structures. In the present study is to evaluate the seismic performance of G+5 RC box shaped building with vertical regular and vertical irregular like mass irregularity subjected to earthquake forces. The modeling and analysis of the building is done by using ETABS 2015 software and evaluated by considering non-linear static analysis called pushover analysis. Different seismic responses like lateral displacement at the end of projection (C1) and at the re-entrant corner (C2) and storey shear force are obtained. By using these responses a comparative study has been made between vertical regular and irregular buildings. The result remarks the conclusion that, a building with mass irregularity provides instability during seismic loading. Therefore to control the instability, a proportionate amount of mass is advantageous to control over the story.

Keywords: mass irregularity, pushover analysis, lateral displacement, storey shear, ETABS 2015.

DOI: https://doi.org/10.15623/ijret.2018.0705016