Evaluation of performance of retrofitted reinforced concrete beam column joints-a simplified model

Abstract

This paper presents an experimental investigation on the behaviour of retrofitted beam-column joints subjected to cyclic loading. The beam-column joints were designed for gravity loading. The same joints were retrofitted for seismic loading with four different retrofitting strategies essentially to achieve equal strength of the segment under sagging and hogging bending moments. The results obtained from the experimental investigation gives better understanding of the strengthening and repair methodology of FRP strips, FRP sheets, MS flats and embedded additional reinforcement in RC beam–column joints under cyclic loading. A simple analytical model proposed by Ibarra et al. is shown to be an excellent tool for performance evaluation of the retrofitted beam column joints. The progressive damage in the retrofitted elements can also be well predicted.