October 2019
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66 Reads
In high rise building or multi storey building, soft storey construction is a typical feature because of urbanization and the space occupancy considerations. Reinforced concrete framed buildings with in-fills are usually analyzed as bare frame, without considering the strength and stiffness contributions of the in-fills. However when subjected to a strong lateral loads, infill panels tends to interact with bonding frame and may induce a load resistance mechanism that is not accounted for the design. These provisions reduce the stiffness of the lateral load resisting system and a progressive collapse becomes unavoidable in a severe earthquake for such buildings due to soft storey. This storey level containing the concrete columns were unable to provide adequate shear resistance, hence damage and collapse are most often observed in soft storey buildings during the earthquake. Open first storey is a typical feature in the modern multi-storey constructions in urban India. Such features are highly undesirable in buildings built in seismically active areas; this has been verified in numerous experiences of strong shaking during the past earthquakes. Response spectrum analysis is chosen for the analysis of the model since it provides response to the applied loads and spectra conditions. In the current study the focus is on the performance and behavior of a structure with soft storey at different floors with the help of response spectrum method. For analysis purpose, six different cases of model are studied using ETABS V.16.03. A G+20 building with simple square plan is considered, as per IS 456:2000 and IS 1893:2002.