Study On Seismic Behavior Of Lattice Concrete Walls Strengthened By Concrete Filled Steel Tube

Since the twenty-first Century,the global energy crisis and environmental pollution have increasingly become the biggest threat to mankind,which has brought many negative impacts on modern social life.Under such a big background,it is an effective way to solve the current problems to develop green buildings and realize energy efficiency of buildings,while the EPSC lattice type concrete wall with green environmental protection,noise,insulation,bearing and construction as one of the advantages of the characteristics favored by people,the research and application of localization in China,there are many successful projects,however,due to its limited seismic performance,it is more used in low rise buildings.How to improve the seismic performance of the wall,and can be widely used in high-rise buildings in seismic fortification area,is of great significance.This paper designs the concrete filled steel tube in the wall joined in the formation of steel lattice under the action of strengthening the new construction wall,using composite wall strengthening of steel ABAQUS finite element software for quasi static simulation analysis,to study the seismic performance.The main work and achievements are as follows:(1)A numerical model of steel tube columns and shear wall paper wall similar,through simulation and experiment on the failure modes,hysteretic curves,skeleton curves and deformation ability and other aspects of the analysis,verify the rationality and accuracy of modeling method.(2)Through comparison of steel lattice columns composite wall with ordinary concrete lattice wall,analyzed the stress characteristics of the new type of composite wall.Due to the mutual restriction effect of the steel tube and core concrete,the steel pipe to strengthen composite wall under the action of the concrete wall after failure to "split column" form to share the external force,the composite wall in the dissipative capacity,bearing capacity,deformation capacity than ordinary shear wall has improved significantly.(3)The numerical simulation of the different parameters of the model is carried out to study the behavior of the new composite wall under the influence of different factors.Numerical analysis results show: the displacement ductility coefficient was higher than that in the seismic design code requirements;with the increase of the ratio of height to width of the combination,the bearing capacity of the wall in the fall,and the deformation ability were enhanced,stiffness degradation is slow;within a certain range,the larger axial compression ratio will appear delay of wall cracks and development,and improve the shear the bearing capacity of the wall,but the excessive axial compression ratio will lead to reduce the ductility of wall;when the diameter increases,the bearing capacity of steel pipe wall and stiffness increases,and the displacement ductility decreases,while increasing the thickness of steel tube is conducive to improve the seismic performance of the wall.