A New Study of Seismic Behavior of Perforated Coupled Shear Walls

For years,coupled shear walls have been used in the mid-rise to-high-rise buildings as a part of lateral load resisting system,mostly because of their ability to control the displacement of structures. recently,by changing the concept of design codes from strength-based to performance-based,assessment of nonlinear behavior of coupled walls became important for engineers. therefore,many researchers now are looking for ways to improve and also predict the behavior of coupled walls under severe earthquakes. this paper presents the results of linear,nonlinear static (pushover),and nonlinear inelastic time-history analyses of a 10-story structure with two-dimensional coupled shear walls (csw) which are perforated using three different patterns taken from considering the s22 stress of shell elements of shear walls. nonlinear static analysis results confirm that perforation can increase the response modification factor of coupled walls up to 33 percent. in addition,the results of linear analysis and design indicate that perforation can reduce the required reinforcement of coupling beams and other frame’s structural components. in addition,results of nonlinear inelastic time-history analysis confirm that,using perforation patterns,the base shear—roof displacement hysteretic response improves and the systems with perforation patterns can absorb more energy under severe earthquakes. © 2017,iran university of science and technology.