Seismic retrofit of open ground storey building with shear wall – a methodology

Abstract

Multistoried residential buildings equipped with a good parking space are being the vital requirements for residents since it is related to a much-appreciated economy and functionality. Open Ground Storey (OGS) buildings have come to rescue by upholding the floor space index and covered parking, encourages the builders by choice. The absence of masonry in-fill walls at the ground storey in OGS buildings causes reduced stiffness at the ground storey. The sudden reduction in the stiffness of the open ground storey compared to the above stories, results in high seismic displacement demand, and it should be tolerated by the ground storey itself. Open ground storey building is the most vulnerable structure, when subjected to seismic lateral forces. Making these buildings structurally safe during an earthquake hazard is a thing of importance. IS 1893(Part 1):2016 suggests shear wall retrofit is ideal option for OGS buildings. A retrofit methodology for seismically vulnerable OGS buildings by adding shear wall, has been developed. The superiority of shear wall in alleviating the column side sway mechanism as typical of OGS frames and ensuring an equitable drift distribution in all the floors is highlighted. The application of the shear wall retrofit methodology demonstrated on OGS buildings numerically. Also, the shear wall retrofit is demonstrated experimentally on three storey OGS building model.