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基于非线性纤维梁-柱单元理论,以OpenSees为求解平台分别进行了钢管混凝土结构滞回曲线计算和弹塑性动力时程分析等数值模拟,计算结果与试验吻合良好。钢管内核心混凝土采用考虑钢管约束效应的应力—应变关系,钢材采用随动强化本构模型。在传统纤维模型法的基础上,通过直接在截面层次定义非线性剪切恢复力的方法建立了考虑非线性剪切效应的剪力墙结构数值模型,结果表明该模型能较好地模拟组合剪力墙的抗剪承载力、捏缩效应以及刚度退化等力学性能。对输入不同地震波下钢管混凝土框架体系的动力时程分析表明,基于OpenSees求解平台的非线性纤维模型法能够较好地模拟钢管混凝土框架结构的非线性动力特性。
Based on the nonlinear fiber beam-column element theory, the numerical simulation of the hysteretic curve and the elasto-plastic dynamic time history analysis of the concrete-filled steel tubular structures were carried out with the OpenSees platform. The calculated results agree well with the experimental results. The steel core concrete adopts the stress-strain relationship considering the restraint effect of steel pipe, and the steel material adopts the follow-up strengthening constitutive model. Based on the traditional fiber model method, the numerical model of shear wall considering non-linear shear effect is established by directly defining the nonlinear shear recovery force at the cross-section level. The results show that the proposed model can simulate the combined shear Shear strength of the wall, pinch effect and stiffness degradation and other mechanical properties. Dynamic time history analysis of CFST frame under different seismic waves shows that the nonlinear fiber model based on OpenSees solution can well simulate the nonlinear dynamic characteristics of CFST frame.