Abstract
In many cases, existing reinforced concrete (RC) columns have been designed according to old seismic recommendations and present inefficient seismic behavior. Moreover, they usually have prior damages due to moderate earthquake excitations. Therefore, it is necessary these columns to be retrofitted. Many researches concern the seismic strengthening of RC columns with fiber reinforced polymers (FRP) and models have been proposed for calculating shear strength (VR) and ultimate chord rotation capacities (θu). This paper focuses on columns with lap-spliced bars, with or without previous damages, externally confined with FRPs. The accuracy of KANEPE and EC8.3 equations for estimating VR and θu is investigated as well as reasonable modifications are proposed to improve the accuracy of predictions.
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