Research On Axial Compression Mechanical Properties Of Short Columns Of Self-compacting Concrete Filled Double Skin Steel Tubes Based On The Analysis Of Finite Element

Concrete-filled double skin steel tube columns is a new type of composite structure in which two steel pipes are placed centrally and filled with concrete between inner and outer steel pipes.This structure not only has the characteristics of light weight,high bearing capacity,good plasticity and seismic performance,but also has the characteristics of cross section,bending rigidity and good fire resistance,so it is widely used in modern buildings.At present,the research on the hollow concrete-filled steel tubular members is not enough in Xinjiang area,and mainly focused on the experimental study.In this paper,the hollow sandwich concrete short column which was filled with self-compacting concrete is taken as the research object and researched the influence factors of the bearing capacity based on the finite element analysis.The numerical simulation analysis method is used to analyze the axial compression performance of the short columns of self-compacting concrete with hollow sandwich steel.The correctness of the model is verified by comparing the numerical simulation results with the experimental results.By using the single factor analysis method,studied the effects of different hollow ratio,length to diameter ratio,diameter to thickness ratio on the bearing capacity of short columns.Based on the univariate analysis,considered the interaction of steel pipes and sandwich concrete to modify the formula of axial compression bearing capacity of concrete-filled hollow steel tubular short columns.By comparing the calculated theoretical formula,the numerical simulation results and the experimental results to verify the accuracy of the formula.