低周反复荷载下梁柱中节点非线性分析

Nonlinear analysis of the middle node of frame structures under cyclic loading

介绍了大型有限元软件ABAQUS中混凝土的本构关系,并对低周反复荷载下梁柱中节点进行非线性有限元分析。得到节点的破坏形态、各阶段钢筋应力的发展情况,以及节点的骨架曲线和滞回曲线。与试验数据的对比表明,ABAQUS的损伤塑性模型能较好地模拟混凝土材料的力学性能,有限元的计算结果能较好地反映节点的破坏模式,荷载特征点和骨架曲线形状与试验结果相吻合。在低周反复荷载条件下,采用ABAQUS模拟节点的力学行为是可行的。

The constitutive relationship of concrete in the finite element software ABAQUS was introduced,and the nonlinear finite element analysis of the middle node of frame structures under cyclic loading was carried out.Then the destruction form of the node,the various stages of development of steel stress,the node skeleton curve,and hysteresis loops were given.Comparison with the experimental data shows that the mechanical properties of concrete could be appropriately simulated by the concrete damaged plasticity model of ABAQUS,and FEM calculation results could reflect the node failure mode reasonably.Furthermore,the load feature point and skeleton curve are consistent with the experimental data.It can be concluded that under cyclic loading using ABAQUS to simulate the node behavior is feasible.