1. SRIDHARA S
2. H SHARADA BAI
Earthquake is one of the important displacement dynamic load occuring underneath the structure which excites the mass resulting in random cyclic oscillatory motion. Regular symmetric buildings subjected to seismic loads will have translatory initial modes without much influence of torsion in comparison with asymmetric irregular buildings. In the present study six irregular buildings with plan resembling C-shape having different mass and stiffness are considered and the analysis is performed using Etabs structural software. Linear dynamic analysis using response spectrum method as per IS1893-2016 considering all the seismic zones and soil type-II is used for study. The influence of static eccentricity on the service load parameters lateral displacement, storey drift ratio and torsional irregularity ratio are analyzed and compared with code limits. Accelerations, storey shear,t orsional moment and overturning moment demand on the structure using strength models are compared with regular square model. The results of analysis are presented in the form of tables and figures which are used to facilitate interpretation of software results to draw conclusions on the effect of plan irregularity which results in torsional coupling increasing demands.
Earthquake, asymmetric, C-shape, eccentricity, Etabs, demand, storeydrift, storeyshear, torsional coupling.