Seismic Performance Test and Numerical Simulation of Square Steel Tube UHPC Columns
Concrete-filled steel tubular(CFST)columns have become a key development direction in building structures due to their high bearing capacity,good seismic performance,and convenient con-struction.However,there is currently limited research on the seismic performance of ultra-high perfor-mance concrete(UHPC)CFST columns,making further investigation necessary.This paper con-ducted a comparative analysis of the seismic performance of different types of square CFST columns(4 UHPC square CFST columns,1 high-strength square CFST column,and 1 ordinary square CFST column).Using low-cyclic loading test data from 6 square CFST columns,a fiber finite ele-ment model was established to perform a parametric analysis.The study mainly investigated failure modes,hysteresis curves,skeleton curves,ductility and energy dissipation capacity under low-cyclic loading test,and analyzed the influence of main design parameters such as axial compression ratio,steel ratio and concrete type.The results showed that:(1)The fiber finite element model could effec-tively analyze the hysteretic characteristics of UHPC square CFST columns.(2)Compared to ordinary and high-strength square CFST columns,UHPC square CFST columns exhibited better seismic per-formance.(3)As the axial compression ratio increased,the horizontal bearing capacity and stiffness of the test specimens increased,but ductility decreased.As the steel content increased,the horizontal load-bearing capacity,stiffness,ductility,and energy dissipation capacity of the specimens all im-proved.As the volume fraction of steel fiber increased,the ductility and energy dissipation capacity of the specimens were improved.
ultra-high performance concreteseismic performancelow-cyclic loading testfiber model
万方数据
维普
