圆钢管混凝土柱滞回性能分析

Analysis of Hysteretic Behavior of Concrete Columns with Round Steel Pipes

通过确定合理的混凝土和钢材本构模型,采用有限元软件ABAQUS分析圆钢管混凝土柱滞回性能,并基于现有试验验证了有限元模型的准确性,分析了轴压比、钢管壁厚以及混凝土和钢材强度对圆钢管混凝土耗能能力、刚度退化及强度退化的影响。分析结果表明,圆钢管混凝土柱滞回曲线饱满且无明显捏缩。轴压比较小时,刚度和强度基本不退化,轴压比较大时,滞回环面积减小较多,强度和刚度退化有所加快,但不明显。钢管壁厚越大,钢管耗能能力越好,强度退化越慢,这证明钢管混凝土柱具有较好的抗震性能和耗能能力。

By selecting reasonable constitutive models of concrete and steel,the hysteretic behavior of CFST columns is analyzed by using finite element software ABAQUS,and the accuracy of the finite element model is verified based on the existing tests.The effects of axial compression ratio,steel tube wall thickness and concrete and steel strength on the energy dissipation capacity,stiffness degradation and strength degradation of CFST are analyzed.The analysis results show that the hysteretic curve of concrete-filled steel tubular column is full and there is no obvious pinch.When the axial compression ratio is small,the stiffness and strength do not degenerate.When the axial compression ratio is large,the hysteresis area decreases more,and the degradation of strength and stiffness is accelerated,but not obvious.The larger the wall thickness is,the better the energy dissipation capacity is and the slower the strength deg⁃radation is.This proves that CFST columns have good seismic performance and energy dissipation capacity.