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A large number of researchers have studied the behavior of infilled frames. It is evident through their studies that infill walls can provide both an economic and practical means for the lateral stability of framed structures and a viable alternative for retrofitting existing structures to resist seismic, wind, and blast loads. Despite this, there is reluctance from the engineering community to use this structural system widely and consider infill walls as structural elements due, firstly, to lack of knowledge concerning the composite behavior of infilled frames, and secondly, due to lack of practical methods for the stiffness and strength prediction.