SEISMIC ANALYSIS OF MULTI STORY BUILDING WITH FLAT SLAB RESTING ON PLAIN AND SLOPING GROUND

Abstract

 Buildings constructed in hilly area are irregular and asymmetric therefore they are subjected to severe torsion in addition to lateral forces under the action of earthquake forces. Many buildings on hilly slopes are supported by columns of different heights. The shorter columns attract more forces as the stiffness of the short column is more and undergo damage when subjected to earthquake. Flat slab is most widely used system in reinforced concrete construction in office, residential, commercial and industrial buildings in many part of the world. They are generally employed for architectural reasons for large span and floor height in case of
auditorium, theatre halls, and showrooms. The objective of the present work is to study the seismic behaviour of flat slab RC building resting on plain and sloping ground with floating column and to compare the behaviour of step back and step back-set back building
configuration. The analysis is carried out for G+10 story flat slab RC building resting on different slope i.e.100 ,200 and 300 are compared with plain ground model. The Equivalent static method and Response spectrum method is adopted and analysis is carried out by using ETABS 2015 software. The various seismic parameters such as story displacement, story drift, base shear and time period are obtained from analysis and the result are compared. From the study it is conclude that story displacement, story drift and time period is more for plain ground model as compare to sloping ground model because of increase in stiffness of sloping ground model. Base shear of sloping ground model is more as compared with plain ground model, because of increase in self weight of the
building. From the study it is concluded that step back set back building model has least value of story displacement, time period, story drift and base shear as compared to step building model. From the study it is observed that base shear value is more for 300 slope model as compared 100 , 200 and plain ground model. From overall study it is concluded that flat slab RC building with step back-set back building shows better seismic performance as compared to step back model.