| The steel plate shear wall structure is considered to be excellent anti-earthquake-resistance structural system.Single-story and single-span steel plate shear wall structure are the basis for understanding the energy consumption and failure mechanism of embedded steel plates.The failure process and characteristics of energy consumption in steel plate yield of multi-story and multi-span steel plate shear walls are more complicated.The reason is that there is not only single steel plate,but also the buckling and yield energy consumption of different parts in multi steel plate.It is a problem of the overall energy consumption of the frame column and steel plate structure.In order to understand the regular and the failure signature of the main component column,this paper conducts a detailed calculation to analysis the failure process of the multi-story and multi-span steel plate shear wall structure under the condition of horizontal reciprocating loads.The elastic buckling analysis is performed on sixty steel plate shear wall structures with different plate thickness,stories and spans.The result of the study is that the initial buckling stress of the steel plate shear wall structure will decrease with the increase of the steel plate height-to-thickness ratio,as well as the increase of the number of structural stories.What’s more,it will increase with the growing of structural spans.In conclusion,it is of great importance to optimize the steel plate thickness and structure story spans in practical engineering management.Multi-story and multi-span structures of loading method are designed and the initial defects of the structure are also taken into consideration.The statistical analysis results illustrate that when the two-span steel plate shear wall structure fails,only one side of frame column generates a plastic hinge merely.There are obvious differences between the two sides of the columns with single span and double span.When the multi-layer multi-span steel plate shear wall structure fails,part of the steel plate does not yield energy and is still in an elastic working state which leads to lower energy consumption efficiency.The fullness of the hysteresis curve is significantly lower than that of a single-layer single-span structure,and it is difficult to utilize fully the overall energy consumption capacity of the structure.A three-story two-span steel plate shear wall is taken as a typical case in our study,with detailed elastic-plastic analysis of the failure and energy dissipation process under low-cycle reciprocating load.Three types of plate thickness structures are selected for comparative analysis.The results show that the sequence of buckling and yielding of the steel plate are not symmetrically distributed when loaded to the left and right with the influence of the initial imperfections.And the position where the initial imperfections applied will buckle and yield earlier.The steel plate in the three-story and two-span steel plate shear wall structure will first buckle and then yield.The tension band will be generated earlier with a greater effect.When the structure comes into fail,the steel plate on the top has small yield area,the energy consumption capacity is not fully utilized,but the utilization rate becomes lower.The stress and deformation evolution process of the middle column is analyzed and compared with the side columns.The results show that the central column is mainly subjected to tensile stress due to the joint action of the steel plates on both sides and the tension bands generated.The lateral displacement curve basically maintains a straight line.However,side column has only one side of the steel plate,which is more prone to tension and compression asymmetry,and the side shift curve appears to be concave to a certain extent.Therefore,the middle column is less prone to plastic hinges than the side columns.Therefore,the rigidity of the middle column can be appropriately reduced,and the side column can be improved properly in actual engineering. |
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