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۱NONLINEAR BEHAVIOR OF RC I–SHAPED AND RECTANGULAR SHEAR WALLS
نویسنده(ها): ، ،
اطلاعات انتشار: ششمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله، سال
تعداد صفحات: ۹
A numerical study using finite element analysis is performed to investigate the behavior of reinforced concrete shear walls with I–shaped and rectangular cross sections and subjected to combined axial force and monotonic lateral load. The specimens selected for calibration and verification include one framed wall where the boundary elements protrude from the surface of the wall (SW3) and one wall with rectangular cross section (SW5), which were tested under monotonic loading in the University of California. The analytical models are implemented in ABAQUS 6.6 to allow comparison between experimental and analytical results for the test specimens. The analysis results show excellent agreement with experimental measurements of the specimens. An important feature of the study focuses on capability of the model in predicting the mode of failure of the specimens, especially the out–of–plane deformations of the compression column observed in the experimental behavior of the rectangular wall (SW5). Actually, the failure of Specimen SW5 is accompanied by out of plane deformations which is a common phenomenon observed in plain rectangular walls, not having relatively stiff confined boundary elements. This mode of behavior is evaluated in comparison with the one of the Ishaped model (SW3) using distribution of the von Mises stress. A parametric study is also conducted to investigate sensitivity of the model to mesh refinement. Although using finer elements to mesh the model results in more accuracy of the response, the CPU time increases considerably as a result.<\div>

۲RC FRAME–SHEAR WALL INTERACTION USING A MACRO MODEL
نویسنده(ها): ، ،
اطلاعات انتشار: ششمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله، سال
تعداد صفحات: ۸
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.<\div>
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