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The shear capacity of masonry-infilled reinforced concrete (RC) frames is determined experimentally by testing of five 2/3 scale, one story, one bay infilled RC frame specimens with varying degrees of separation between upper and lower portions of the masonry infill panel. The main premise of this experimental study was to find the contribution of masonry panel in global resistance of infilled RC frames versus shear force. Based on the experimental results, a new method is proposed for the determination of the shear resistance and the contribution of the masonry infill panel is derived. Comparisons of experimental and analytical results show that the proposed method for evaluating the shear resistance of the masonry panels offers a promising approach for the design of infilled RC frames. Furthermore, the results of this study indicate that the shear resistance of masonry panel in infilled RC frames is strongly influenced by the stiffness and lateral resistance of the RC frame.

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This paper describes an experimental programme in which seven reinforced concrete (RC) frames with masonry infill were tested under cyclic lateral loading. Based on the behaviour of the tested units, a new macromodel was developed based on a multi-strut formulation to analyse infilled RC frames. Comparison of the analytical results of the model with experimental data revealed that the proposed model yields a more reasonable lateral strength result than conventional analyses. Furthermore, the model can be used to predict the different failure modes of infilled RC frames, which will be useful for the future analysis and design of infilled RC frames.