圆钢管混凝土柱滞回性能参数分析

Analysis of hysteretic behavior parameters of concrete filled circular steel tubular columns

为研究圆钢管混凝土柱的滞回性能,选取合理的材料本构和混凝土损伤模型,基于有限元软件ABAQUS建立了圆钢管混凝土柱的滞回数值模型,并与现有试验数据进行模型验证。在此基础上,建立典型算例,描述典型算例在往复荷载作用下的受力全过程,对其破坏模态进行了分析,并根据构件的屈服和破坏将骨架曲线分为3个阶段,根据加、卸载过程将滞回环分为8个阶段,对每个阶段的受力情况进行描述。最后,对轴压比、钢管壁厚度、钢材强度、混凝土强度、长细比等影响构件滞回性能的因素进行了参数分析,结果表明,轴压比和长细比对构件滞回性能的影响较为显著,提高钢材强度、混凝土强度和钢管壁厚度可在一定程度上改善构件的滞回性能。

In order to study the hysteretic behavior of concrete filled circular steel tubular columns,reasonable material constitutive and concrete damage model are selected,Numerical model for the hysteretic behaviour of concrete-filled steel tubular columns was developed by finite analysis software ABAQUS.The FE model is verified with corresponding experimental tests.On this basis,a typical example is established,the whole loading process of typical examples under cyclic loading loads is presented,and the failure modes are analyzed.The skeleton curve is divided into three stages according to the yield and failure of components,and the hysteretic loop is divided into eight stages according to the loading and unloading process,the mechanical behavior at each stage is described.At last,the parameter analysis is carried out for the factors that influence the hysteretic behavior of components,such as axial compression ratio,thickness of steel tube wall,steel strength,concrete strength and slenderness ratio.The results show that the effect of axial compression ratio and slenderness ratio on the hysteretic behavior of components is significan.The hysteretic behavior of the components can be improved to some extent by increasing the strength of steel,the strength of concrete and the thickness of steel tube wall.