Seismic Analysis of Soft Storey Reinforced Concrete Structure with Eccentric Bracin

Abstract

A building construction in India is generally of masonry infill reinforced concrete (RC) construction. In case of multi-storey buildings, the common practice is to keep storey free from masonry infill. This is done mainly to fulfil parking requirements of occupants or commercials spaces in case of upper storey. In present study eccentric bracings are used as a means to reduce soft storey mechanism in masonry infill reinforced concrete (RC) building which provides ductility and lateral stiffness to structure with greater economy. Non-linear analysis i.e. time history analysis is used to study the seismic response. Open storey also provides free space for commuting of vehicle at soft storey level. Seismic performance of a structure located in Indian seismic zone-V as per Indian standard code 1893-2016 is investigated using nonlinear dynamic analysis. To account stiffness and structural action of masonry infill panels, the equivalent diagonal strut method has been utilized. Three ground motion records are used to perform the earthquake analysis of the considered model configurations. The finite element based software ETABS has been used in developing the building models and performing analysis. Various response parameters like base shear, storey displacements, and storey drift are calculated to understand seismic behaviour. Result of this study conducted show that by using eccentric bracing drift limitation given in IS 1893;2016 get satisfied.