Study On Seismic Behavior Of High Strength Concrete-filled The Gap Between Stainless Steel And Steel Tubular Columns

The Stainless steel-High strength concrete-Ordinary steel Double-skin tubular columns stands out among many structures due to its high bearing capacity,strong corrosion resistance,and low maintenance cost,so that it is favored by many scholars.This type of composite structure is in line with the development trend of light weight and high efficiency in the construction industry,and it is fully utilized in the fields of ocean engineering,bridge engineering and super high-rise buildings.Obviously,it’s important to ensure the safety of this new type structure.Once damage occurs,it will bring unpredictable losses to social development and people’s lives and property.Therefore,ensuring the safety of this new type structure is the primary goal.This paper starts with the theoretical research and application of the Stainless steel-High strength concrete-Ordinary steel Double-skin tubular columns,hen using ABAQUS finite element software to simulate this double-skin tubular columns.The damage and destruction of the double-skin tubular columns under low-cycle reversed horizontal load provide a reference for the research of seismic performance.The main research works are as follows:(1)Taking the hollow section ratio and the strength of concrete as the test parameters,the monotonic axial compression and cyclic axial compression tests were carried out on 18 stainless steel-high-strength concrete-ordinary steel double-walled hollow columns,from the force process,failure mode,load-displacement curve Research on its mechanical properties and other aspects.In conclusion,for one thing,growing up the hollow rate result to low bearing capacity;On the other hand,growing up the strength of concrete result to high bearing capacity;with the force load and withdraw,the bearing capacity only changed a little.(2)Based on the consideration of materials,boundaries and geometric nonlinearity,a finite element model of stainless steel-high-strength concrete-ordinary steel double-wall hollow columns under cyclic loading is established,and the simulation results can accurately predict the experiment.Simply stated,this finite element model is precise.(3)Selecting the axial compression ratio,the strength of concrete,the hollow section ratio,the yield strength of steel pipe,and the slenderness ratio as the simulation parameters,establish a finite element model of stainless steel-high-strength concreteordinary steel double-wall hollow columns under horizontal low-cycle reciprocating loads,To study the influence of different parameters on its seismic performance from the aspects of hysteresis curve,skeleton curve,ductility,energy dissipation performance and stiffness degradation,and provide reference for studying its seismic performance.The analysis shows that the axial compression ratio and slenderness ratio have the most significant influence on the seismic performance of stainless steel-highstrength concrete-ordinary steel double-wall hollow columns.