Finite Element Analysis Of Bearing Capacity Of Concrete Filled Steel Tubular Columns Under Low Cycle Repetitive Load

With the fast development of modern society, and many-storied buildings,industrial factory buildings, the elevated bridges are more and more popular and alsobeing rising.The concrete-filled steel tubular column is used more and more widely,increasingly brought to the attention of many research scholars and research.China inthe early stage have tried to start using concrete-filled steel tubular column.There isintroduced some simple reason.The construction cycle is short for buildingproject,and it can also save dosage half of rebars.And it can not only have highcapacity, but also the refractory performance have a further rise space.However,forconcrete-filled square steel tubular column of theoretical and experimental research ismore than less,especially earthquake resistant behavior in the concrete-filled squaresteel tubular column is weak.Therefore,the study of concrete-filled square steeltubular column’s ductility and seismic performance is extremely important.In this paper,through a large finite element analysis software ABAQUS tosimulate the concrete-filled square steel tubular column under cyclic loading hasbeing discussing properties of the finite element analysis.It is based on the basic ideasand the solving method of the finite element and established six test specimens.Andthe predecessors done in a low concrete-filled square steel tubular column undercyclic loading was simulated, and it can spend some time analysing the componentshysteretic curve.At last it was compared with the experimental values and numericalvalues and it could summarize conclusion that the of numerical simulation is feasible.And then set up nine specimens, it began on respectively from the axial compressionratio, slenderness ratio and coefficient of ferrule to considering the three influencefactors of concrete-filled square steel tubular column hysteretic curve and skeletoncurve,and it can summer up conclusions of that hysteretic curve obtained which ismore or less full, and it do not exist obvious pinch phenomenon.With axialcompression ratio increasing, skeleton curve is showing a rising trend, and it reflectsthe good ductility and seismic performance.And with the slenderness ratio andcoefficient increasing slowly,skeleton curve is also showing an upward trend, showinga relatively good ductility capacity and seismic performance. By orthogonal contrastsanalysis,to study the influence of the three influencing factors on the ductilitycoefficient,it was found that the other axial compression ratio of steel tubular columnductility brought the greatest impact, followed by the ferrule coefficient, and theslenderness ratio was the least of three factors. Finally using multivariate nonlinear regression analysis software SPSS deduced the three ferrule factors of axialcompression ratio, slenderness ratio, ferrule coefficient on the ductility coefficientregression equation, and at last there was also test of F distribution.It was concludedthat the0.01level was notable.Through this paper’s analysis,could provide a theoretical basis for analysisto high-rise buildings or other complex industrial factory building in concrete-filled square steel tubular column seismic performance requirements in the future.