ETABS Analysis for Edge Supported and Flat Slab (With and Without) Perimeter Beam at High Seismic Zone

Abstract

Flat slab structure are more convenient, economical and provide better architectural visibility over conventional 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. Therefore, perimeter beams are provided which imparts rigidity to the structure. This paper focuses on the comparative study of conventional slab structure to flat slab structure having perimeter beams. In this study, ETABS software is used for the analysis of different structures in high seismic zones of Mymensingh (0.36) in Bangladesh having G+6 and G+11 storeys. The models taken in this study have rectangular shape configuration. On the basis the analysis results, the paper discusses the distinctions of structure’s behavior under different slab in terms of maximum storey displacement, maximum storey drift and storey stiffness. The storey displacement of flat slab is approximately three times than conventional slab and two times than flat slab with perimeter beam for G+6 storey and two times than conventional slab and one-half times than flat slab with perimeter beam for G+11 storey. The storey drift is also same as storey displacement. The stiffness of conventional slab supported structure is approximately four times than flat slab and two times than flat slab with perimeter beam for G+6 storey. The stiffness of conventional slab supported structure is approximately three times than flat slab and two times than flat slab with perimeter beam for G+11 storey. This is due to the conventional slab structure has a greater stiffness than flat slab structure and flat slab with perimeter beam structure. Lastly three data analyze of the three types of buildings showed that the conventional slab performed best in all three cases of displacement, drift and stiffness. But the flat slab with perimeter beam is giving satisfactory results. Therefore, the idea of flat slab with perimeter beam can be developed in those places where it is necessary to give flat slab in the Earthquake zone. KEYWORDS: Flat Slab, Conventional Slab, Seismic Analysis, Perimeter Beams, Seismic Zones, ETAB