Axial Compressive Bearing Capacity and Its Composition of Circular Concrete-Filled Steel Tubular Columns
A novel constitutive model for concrete material was incorporated into the VUMAT subroutine of ABAQUS to investigate the respective bearing capacity contributions of the steel tube and concrete in circular concrete-filled steel tubular(CCFST)columns under interaction.A three-dimensional finite element model was established to reflect the interaction between the steel tube and concrete in CCFST columns,and the model was validated against experimental data for load-displacement curves,load-deformation curves of the steel tube and concrete,and lateral deformation curves.Based on the established models,the influence of concrete strength,steel yield strength,diameter-to-thickness ratio,and confinement coefficient on the bearing capacity and its composition of CCFST columns was analyzed.Subsequently,a mathematical model for the peak bearing capacity of CCFST columns under axial compressive load was derived using the finite element models.To evaluate the stress state of the steel tube and concrete,the proposed proportional coefficient of circumferential stress in the steel tube and the contribution coefficient of concrete strength were introduced.The proposed formula was compared to current specifications and existing research to verify its accuracy and capability to evaluate the bearing capacity contributions of the steel tube and concrete.
circular concrete-filled steel tube(CFST)columninteractionconfinement effectfinite element methodaxial compressive bearing capacity
国家科技期刊平台
NSTL
万方数据
