A Comparative Study of Beam Supported Slab and Flat Slab Structures Under Seismic Loading Using ETABS 18.1.0

Abstract

This study undertaken to carry out comparative analysis of buildings with different slab systems by using ETABS 18.1.0 and to compare the analytical results with different slab system and also to conduct a parametric study on the lateral strength of building with different load combination. Total six models, three of G+6 and three of G+11 building was analyzed to compare the results of different parameter. This paper focuses on the comparative study of Beam Supported slab structure to flat slabstructure. In this study, ETABS 18.1.0 software is used forthe analysis of different slab supported structures with BNBC 2020 in seismic zone IV.The models taken in this study have rectangular configurations for residential building. Flat slab structure is more convenient, economical and provide better architectural visibility over Beam Supported slab structure. But flat slab structures are flexible in nature and thus pose a threat to the safety of the structure which brings us to find a method to overcome this disadvantage. The paper discusses the distinctions of structure’s behavior under different slab in terms of maximum story displacement, maximumstory drift and story stiffness. The story displacement of flat slab is approximately three times than Beam Supported slab. The story drift is also same as story displacement. The stiffness of Beam Supported slab structure is approximately four times than flat slab and two times for G+6 story. The stiffnessof Beam Supported slab supported structure is approximately three times than flat slab and two times than flat slab with perimeter beam for G+11 story. This is due to Beam Supported slab structure has a greater stiffness than flat slab structure. Keywords: Slab Systems, Beam Supported Slab, Flat Slab, Seismic Zone -IV, Drift, Displacement, Stiffness