In fluence of diaphragm opening on seismic response of rectangular RC buildings with end shear walls

Abstract. Routinely, behavior of oor diaphragms is assumed completely rigid in their plane, which leads to erroneous results in analysis and design of some particular buildings. In this study, 4-story RC buildings, with end shear walls and plan aspect ratio of 3, are considered in order to investigate the in uence of diaphragm openings on their seismic response. It is concluded that although in-plane oor exibility has enormous eects on pre-yielding part of pushover curve, it has no in uence on post-yielding part of that. Furthermore, the opening beside shear walls has crucial impact on response of building. Hence, it would be better o avoiding opening near the shear walls; if not, the in-plane exibility of diaphragm has not to be overlooked even if the plan aspect ratio of building is 3.