Study On Seismic Performance Of Concrete Filled Steel Tube Frame-Grille Type Steel Plate Shear Wall Structure

Referring to the advantages of concrete filled steel tube,a grille type steel plate shear wall is proposed.In order to meet the super high-rise building's requirements of high axial compression ratio,high ductility and thin wall,concrete-filled steel tube frame-grille type steel plate shear wall structure is established to improve the seismic performance of super high rise structure.In this paper,experimental analysis and finite element analysis,combined with elastoplastic Pushover analysis and dynamic elastoplastic time history analysis of structural system were used.The main work and research results are as follows:Two specimens of grille type steel plate shear wall and a concrete filled steel tube frame-grille type steel plate shear wall structure were designed and made,and low cyclic loading test was carried out.The test shows that,new type shear wall has good seismic performance,slow stiffness degradation,stable strength degradation,full hysteresis curve and high ductility coefficient which can meet requirements of high axial compression ratio,high ductility and thin wall.The hysteretic curve area of concrete-filled steel tube framegrille-tube steel plate shear wall is larger,the ductility performance is stronger,and the energy dissipation capacity is also improved.After the shear wall becomes plastic,it can still bear most of the horizontal load,which greatly postpones the plastic damage of the frame.The nonlinear finite element simulation analysis of concrete filled steel tube framegrille type steel plate shear wall based on ABAQUS was carried out to compare with the experimental results,the results are highly consistent and credible.The finite element analysis model of concrete filled steel tube frame-reinforced concrete shear wall was established and used to be compared with the former model.The comparison of the force process and seismic characteristics is made to verify the superior seismic performance of the grille type steel plate shear wall in the mixed structure system.The effects of the yield strength of shear wall steel plate,height width ratio of shear wall,the strength of concrete and different section sizes of concrete filled steel tube column on the seismic performance of the concrete filled steel tube frame-grille type steel plate shear wall structur were studied.Based on two grille type steel plate shear walls,a simplified trilinear skeleton curve is established,which provides a reference restoring force parameter.Based on a concrete filled steel tube frame-core tube structure as the research object,considering different shear wall forms(reinforced concrete shear wall,steel concrete composite shear wall and grille type steel plate shear wall),elastoplastic Pushover analysis and dynamic time history analysis are carried out.The seismic performance differences of three types of structures are analyzed from three aspects of interlayer displacement angle,interlayer shear force and bottom shear force.The result shows,compared with the other two models,concrete filled steel tube frame-grille type steel plate shear wall has the smallest interlayer displacement angle,the largest interlayer shear force and more bottom shear distribution of the total shear ratio.Under the action of strong earthquakes,the grille type steel plate shear wall can maintain enough capacity and the stiffness degradation speed,which effectively delayed the plastic development failure of concrete-filled steel tubular columns,fully ensuring the target of “No Collapsing in the Strong Earthquake”.