A low cost and effective scheme has been developed for retrofitting masonry-infilled reinforced concrete (RC) frames.
Three ¾ scaled models of single bay, single story non-ductile RC frames with un-reinforced masonry (URM) infill panels were tested under horizontal cyclic loading and a constant vertical load. The experimental results indicate that an un-retrofitted specimen suffers corner crushing and abrupt shear failure in the columns at a very small drift ratio of
0.50%. The retrofitted masonry panel is separated from the columns so that no shear is transferred to them. Steel brackets are provided to transfer the interactive forces between the RC frame and URM panel. The peak lateral load decreases approximately in proportion to the area reduction ratio of the panel with desirable gradual drop in capacity whereas the drift capacity increases to about 1.50%. The retrofit scheme compares favorably with others incorporating either heavy mesh reinforcement or carbon fiber reinforced polymer.
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