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Study on Seismic Induced Torsion of a Multi-Storied Building with Different Irregularities with And Without Base Isolation System


Kusuma B , BMSCE, Bangalore


Multi-Storey Building, Unsymmetrical Configuration, ETABS V, Seismic Performance, Structural Response Parameters


The rapid expansion of the urban population and consequential demand on limited space has significantly increased the construction of multi-storey buildings. Therefore, the principle objective of the Structural Engineer is to design and construct the structure by taking in to consideration, the dynamic actions caused on the building, in terms of earthquake forces, in such a way, that the damage caused to the structure due to these dynamic actions are minimized. The paper aims at evaluating the seismic actions by considering various CODAL provisions, which are particularly provided for the analysis of RC building with unsymmetrical configuration and with different types of irregularities. The analysis is carried out on a model of G+49 stories of RC framed structure with unsymmetrical floor plan located in Zone IV, soil type III, using finite element based ETABS (V 13.1) software. The various structural response parameters such as, storey displacement, storey drift, base shear and storey stiffness are determined by considering different irregularities such as mass irregularity, vertical geometric irregularity, re-entrant corner, diaphragm discontinuity and stiffness irregularity in the model and the structural parameters stated above are compared for the models having different irregularities. Seismic analysis is carried out using response spectrum method for both symmetrical and unsymmetrical building. The extensive literature survey is carried out by referring to the technical journal papers, books, articles, etc. to familiarize with fundamental concept of the topic. The need for research is identified and the procedure to carry out the analysis is formulated. The data required for the input is collected from IS code 1893 (Part I):2002. Then the analytical work is carried out as per the procedure formulated and the results are obtained and varied conclusions are arrived at. The major part of the study includes the comparison of values of set of response parameters such as, mode period, storey lateral displacement, storey drift, base shear and the storey stiffness.

Other Details

Paper ID: IJSRDV6I110015
Published in: Volume : 6, Issue : 11
Publication Date: 01/11/2019
Page(s): 327-330

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