investigating the effect of masonry infill walls on the performance of steel resisting moment frames by using seismic fragility curves

Due to their ductility, high energy absorption capacity, and low construction time, steel structures exhibit betterperformance and are more cost-effective than other types of structures. besides, since steel components possess highstrength and their strength to weight ratio is larger than that of reinforced concrete, they are widely used in large wide-span frames and high-rise buildings.in most steel or rc structures, masonry infill walls are used to parcel out the internal space of the structure and also to separate the interior of the building from the external space. masonry infills are made up of bricks and mortar, which together act as a monolithic whole. the discontinuous nature of the masonry infill causes it to usually exhibit a brittle behavior.