Failure Process Of Two-story Steel Plate Shear Wall Structure And Force Mechanism Of Intermediate Beam

As an effective anti-side force system,the steel plate shear wall structure is to give full play to the strength of the steel plate after buckling,and to use the steel plate to yield energy,thereby protecting the frame line elastic work.For the failure mode and the typical characteristics of the failure process of the steel plate shear wall structure,it is of practical significance for the engineering structure design and safety assessment.The single-story steel plate shear wall structure mainly analyzes the working characteristics and optimization of the embedded steel plate.In the analysis of multi-story steel shear wall structure,it is generally considered that the role of the steel plate tension band on the intermediate beam cancels each other,and there is not much attention to the force characteristics of the middle beam.To this end,this paper focuses on the failure mode and failure process of two-story steel plate shear wall structure,and analyzes the failure process of the steel plate in different layers and the stress evolution characteristics of the intermediate beam.The nonlinear failure process of two-story steel shear wall structure under low-cycle reciprocating load is simulated.The typical characteristics of failure process and stress evolution of two-story steel shear wall structure under different high-thickness ratios are compared and analyzed.The four typical stages of failure of the steel plate in the two-srory steel shear wall are illustrated,that is,the steel plate produces local range buckling,then the outer surface deformation of the steel plate is increased,and the diagonal tension band is formed in the diagonal direction,and then the tensile force of the steel plate tension band continues to develop.And the yield stage is developed by the end,and finally the frame column produces a plastic hinge,and the structure exits the work.The difference between the failure process of single-story and two-story steel shear wall structures is compared and analyzed.It is shown that in the two-story steel shear wall structure,firstly,the bottom steel plate fails first and then develops to the second steel plate.The difference between the steel plate shear stress and the buckling shear strength of the two-story structure in the two-story structure is that the steel plate first bends andyields.The stress evolution process of the intermediate beam and its influence on the structural failure are analyzed in detail.It is clarified that with the increase of horizontal load,the appearance of the tension band changes the stress mode of the intermediate beam,making its stress fluctuations frequent.The upper and lower steel plate tension bands are superimposed and offset on each other on the intermediate beam,so that the intermediate beam always maintains a low stress level.At the same time,the thinner the steel plate,the more obvious the tensile band effect,and the more frequent the vertical stress of the middle beam alternates.When the stress of the center tension band is "stretched",the intermediate beam is subjected to tensile stress;otherwise,when the "compression type" is applied,the intermediate beam is subjected to compressive stress.