Study On Seismic Behavior And Application Of Grille Type Double Steel Plate Shear Wall Structure

Shear wall is an important lateral force resisting component.However,there are some deficiencies in the shear wall of single material.Modern super high-rise buildings urgently need composite shear wall with high bearing capacity,good ductility and strong energy dissipation.Referring to the concrete-filled steel tube structure,a new type of grid-type double-steel plate shear wall is proposed.The shear wall is composed of end groove steel,outer double steel plate and internal tie plate,and the internal cavity is filled with concrete.The comparative test and finite element analysis method are used to study the seismic performance of the grid-type double-steel plate shear wall.At the same time,combined with the actual project,the dynamic elastic-plastic analysis of the CFST frame and the core tube of the grid-type double-steel plate shear wall structure is carried out to explore the seismic superiority of this structural system.The main work and achievements are as follows :(1)A RC shear wall,three grid-type double-steel plate shear walls,a CFST frame,and a CFST frame combined with grid-type double-steel plate shear wall were fabricated for horizontal low-cycle loading test.The test results show that the grid-type double steel plate shear wall has excellent seismic performance with high bearing capacity,good ductility and strong energy dissipation capacity,and its ultimate displacement angle is 1/30 ～ 1/40.The failure modes are bulging failure of outer steel plate and tensile failure of end groove steel.In addition,the CFST frame and the grid type double steel plate shear wall have good cooperative work performance.In the elastic-plastic stage,the CFST frame participates in the work as a two-line defense frame,which leads to the degradation of the bearing capacity,slow stiffness degradation and enhanced energy dissipation capacity of the system.(2)The CDP model is used for concrete,and the metal plastic damage model is used for steel.The ABAQUS finite element model of grid double steel plate shear wall is established,and the calculation results are consistent with the experimental results.On this basis,the stress mechanism analysis shows that the compressive strength and ductility of the filled concrete are significantly improved due to the three-way restraint.The out-of-plane deformation of the outer steel plate is restrained by the internal tie plate,and the inner concrete bears all the pressure to avoid the buckling failure of the outer steel plate.The parameter analysis shows that the lengthwidth ratio of the cavity significantly affects the three-dimensional constraint effect of the filled concrete.It is suggested that the length-width ratio of the end cavity is 1.0 – 1.5,and that of the middle cavity is 1.5 – 2.0.At the same time,the single groove steel at the end of the wall can significantly enhance its bearing capacity and deformation capacity.(3)Combined with the CFST frame-shear wall core tube structure with a height of 300 m,three Perform-3D structural analysis models of RC shear wall,SC shear wall and grid double steel plate shear wall are established for dynamic elastoplastic analysis.Analysis shows that CFST frame and grid-type double steel plate shear wall have good cooperative performance and the CFST frame of dual defense system plays a full role.At the same time,the seismic performance of CFST frame and grid double steel plate shear wall structure is excellent,its interlayer displacement angle is significantly reduced,and the damage degree of shear wall is the lowest.The goal of non-collapse under rare earthquake is truly realized.