钢管钢纤维高强混凝土轴压短柱的数值分析

Numerical analysis of steel fiber reinforced high strength concrete filled steel tubular short columns under axial compression load

针对轴心受压的钢管钢纤维高强混凝土短柱,采用有限元分析软件ANSYS建立了多个圆钢管钢纤维高强混凝土短柱模型进行数值模拟,材料模型使用修正的钢管钢纤维高强混凝土本构关系模型,考虑了钢管和钢纤维对构件的影响,模拟结果与试验结果吻合性较好。对构件进行了影响因素分析,研究结果表明,混凝土强度等级的提高有利于构件承载力的增大;钢纤维体积率的提高使构件承载力提高较大;钢管壁厚的增大对构件承载力提高作用最大。在合理范围内增大钢管壁厚、增加钢纤维体积率并提高混凝土强度等级均能够有效提高轴压构件的承载力。

The steel fiber reinforced high strength concrete filled steel tubular short column under axial compression was simulated and analyzed by using finite element analysis software ANSYS, multiple round steel pipe steel fiber high-strength concrete short column model were established, using the modified constitutive model, which considering the influence of steel tube and steel fiber on components, the simulation results match well with the test results. The three influences of strength grade of concrete, steel fiber volume ratio and steel tube wall thickness on bearing capacity and ductility of component were analyzed.The research results indicate that the increase of concrete strength is beneficial to the increase of load bearing capacity, but a decreasing of ductility slightly. The increase of steel fiber volume rate has improve the load bearing capacity slightly, and a increasing of ductility gradually. The increase of steel wall thickness improving both of the load bearing capacity and ductility of component. The research results can provide certain reference to the scientific search and engineering application of the steel fiber reinforced high strength concrete filled steel tubular component.