رفتار ديوارهاي برشي مركب تحت بارگذاري لرزه يي

SEISMIC BEHAVIOR OF COMPOSITE SHEAR WALLS UNDER CYCLIC LOADING

Steel and composite shear walls are some effective lateral resisting systems with a steel core. The main advantage of these systems is their deformability, due to the buckling behavior of the steel sheet. Two general methods for benefiting this advantage axe using steel-stiffening elements or concrete layers connected to the steel plate by shears connectors. In this research, by studying different behaviors, including the influence of middle beam rigidity, the type of beam to column connection, changes in shear connectorʹs distance, the effect of concrete layer thickness on a composite shear wall, with and without stiffeners and a general behavior of this system against, lateral loads, are investigated. In this regard, various models of such walls are analyzed using the Finite Element method. The analytical results show that the stiffened steel shear wall behavior is independent of the middle beam rigidity and the beam column connection type, but, in a steel shear wall without stiffeners, the increase of middle beam rigidity causes a better monotony of stress distribution in the steel sheet. Also, the shear resistance of a composite shear wall depends on the concrete layer thickness and the distance between shears connectors. So, by stndying the analytical results, an optimum concrete thickness and, also, a snit.able distance between shears connectors, are proposed.