June 2016
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This study gives fragility analysis of masonry infill soft storey frames retrofitted with various types of fibre reinforced polymer (FRP) sheets. Soft storey buildings with first storey free from infill are common choice of multi storey building in India. These type of buildings, due to their abrupt discontinuity in first storey, are known to perform poorly during earthquake. In particular, the columns of soft storey buildings undergo large inelastic deformations under earthquake hence leading to collapse of whole building. The first storey columns of soft storey buildings are retrofitted by confining columns with FRP sheets. Various types of FRP sheets are used for confining column and building models are analyzed using nonlinear static analysis. The confining effect of FRP leads to increased stiffness, strength as well as ductility which results in better performance under earthquake loads. The assessment of performance is done using fragility analysis which is a probability based method of analysis. The result shows that confinement of columns with FRP effectively reduces the probability of collapse of soft storey buildings.