Abstract—This paper highlights the importance of the selection of the building’s wall material,and the shortcomings of the most commonly used framed structures with masonry infills.The objective of this study is investigating the behavior of infill walls as structural components in existing structures.Structural infill walls are very important in structural behavior under earthquake effects. Structural capacity under the effect of earthquake,displacement and relative story displacement are affected by the structural irregularities.The presence of nonstructural masonry infill walls can modify extensively the global seismic behavior of framed buildings.The stability and integrity of reinforced concrete frames are enhanced by masonry infill walls. Masonry infill walls alter displacement and base shear of the frame as well. Short columns have great importance during earthquakes,because their failure may lead to additional structural failures and result in total building collapse. Consequently the effects of short columns are considered in thi
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