RC FRAME-SHEAR WALL INTERACTION USING A MACRO MODEL

A simple macro-model for reinforced concrete shear walls has been used to investigate the nonlinear behavior of structural walls interacting with moment resisting frame systems. The model consists of nonlinear spring elements representing flexural and shear behavior. The flexural behavior of the model is based on the uniaxial behavior of the vertical spring elements defined according to constitutive relations for materials and the shear behavior is based on a trilinear force-displacement backbone curve which is assigned to each horizontal spring element. Having verified its validity in previous studies, the model has been used to simulate the nonlinear behavior of structural walls interacting with moment frame systems. For this purpose three frame-wall structures have been designed using one of the commonly used softwares developed for structural analysis and design of buildings. The structures have been analyzed using a model which incorporates the macro model for shear walls. According to the obtained results, while both approaches have a good agreement in the linear elastic range, they do not match in the nonlinear plastic range of the shear wall behavior. This discrepancy can be attributed to the fact that, in the conventionally used softwares, all the nonlinear effects such ascracking and post yielded behavior of the used materials are taken into account in an approximate sense, using the stiffness modification factors which are commonly proposed by the building codes.

کلیدواژه ها:

Shear Wall ، Macro Model ، Nonlinear Spring Elements ، Frame-Wall Structures