Seismic Performance Test Of Concrete Filled Steel Tube Columns With Hollow Steel Balls Based On Bamboo Cavity Structure Bionics

In order to study whether the concrete-filled steel tube column has seismic feasibility under certain variable cross-section and variable stiffness conditions,from the perspective of bionics,based on the structural characteristics of the bamboo cavity and the superior seismic performance,a circular steel tube with a hollow steel ball is designed.Concrete column.Focusing on the characteristics of the hollow steel ball as a built-in structure,9 circular steel tube concrete columns with hollow steel balls and3 solid circular steel tube concrete columns were produced based on the steel content rate parameter and the hollow configuration method,and simulated The static test,combined with the failure mode,discussed the seismic performance of the specimen through hysteretic accumulated energy dissipation and other parameters.The main work and results are as follows:(1)The steel content has a greater impact on the ultimate load and hysteretic accumulation peak energy consumption of circular steel tube concrete columns with hollow steel balls.Appropriate hollow configuration has a greater impact on the hysteretic accumulation peak of the specimen.The impact of the post-energy consumption is significant;the circular concrete-filled steel tube columns with hollow steel balls have a greater reduction in the ultimate load than the solid circular concrete-filled steel tube columns,and the former has a certain level of accumulated hysteretic total energy consumption than the latter.The test results show that under reasonable conditions,the concrete-filled steel tube column with variable cross-section and variable stiffness can have certain seismic performance.(2)It is revealed that the "V"-shaped broken line of the horizontal load time history curve of the specimen has a good consistent correlation with the bulging alternate phenomenon of the concrete-filled steel tube column and the shrinkage phenomenon of the hysteretic curve.Clarified the disaster warning function of the alternate bulging phenomenon of concrete-filled steel tube columns.This paper proposes and explains that a complementary method with certain applicability can be used to calculate the shrinkage ratio,the shrinkage ratio and the shrinkage coefficient of the hysteresis curve and perform quantitative evaluation.(3)The relationship between the "Z"-shaped curve in the hysteresis curve and the bond-slip phenomenon between the steel pipe and the concrete is judged,and the related characteristics of the bond-slip are defined based on the characteristics of the "Z"-shaped curve.the amount.(4)Put forward and explain the wide practicability of the stage analysis method,use the stage analysis method to divide the cumulative hysteretic total energy consumption,and combine the specific energy consumption to quantitatively analyze and evaluate the specimen.