Abstract

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Title:: Research on Seismic Behavior of Multi-coupling Beams in Shear Wall Structure

Author(s):: FAN Zhong; LIU Chang; WU Hui; China Architecture Design & Research Group

Keywords:: super high-rise building; shear wall; coupling beam; stiffness; shear capacity; ductility; energy dissipation capacity

Abstract:: To tackle the insufficient of shearcompression ratio in design of shear wall structure, the design concepts of multi-coupling beams were proposed. By setting multi-coupling beams rather than the traditional single coupling beam, the shear resistance area and the spantodepth ratio could be significantly strengthened, thus the seismic behavior of the structure was enhanced. The sectional dimensions of multi-coupling beams were determined by making the lateral stiffness of the structure remain unchanged with that of the single coupling beam. Multi-coupling beams and single coupling beam were compared under frequent earthquake actions in terms of structural dynamic behavior, storey drift ratio, lateral stiffness and impact of member internal forces, as well as influence on improving shearcompression ratio. The elastoplastic time history analysis of shear wall structure under rare earthquake action was conducted to prove that multi-coupling beams in the shear wall structure could improve the maximum storey drift ratio, the distribution of plastic hinge, shear capacity and structural nonlinear energy dissipation capacity. The seismic behavior of coupling beams under earthquake action was investigated using nonlinear finite element method. The results show that due to the larger spantodepth ratio of multi-coupling beams, the ductility of members increases greatly, thus the failure patterns change from shear failure to flexural failure.