反复荷载作用下钢筋混凝土柱的非线性分析

Nonlinear Analysis of a RC Column Under Cycling Loads

分别应用有限元分析软件ABAQUS和OpenSEES对Kawashima Earthquake Engineering Laboratory数据库中的一根钢筋混凝土柱在反复荷载作用下力-位移的滞回曲线进行了数值模拟研究。ABAQUS分析时采用分离式建模,混凝土采用实体单元,钢筋采用桁架单元,混凝土的本构关系采用混凝土损伤塑性模型,其中损伤因子采用基于能量损伤原理进行计算,钢筋本构关系采用一种再加载刚度按Clough本构退化的随动硬化单轴本构模型,并用Embed技术进行自由度的耦合;OpenSEES分析时采用dispBeamColumn梁柱单元,混凝土采用Concrete01本构模型,采用Mander模型考虑箍筋的约束作用对混凝土本构参数进行修正,钢筋采用Steel02本构模型。通过两种软件对钢筋混凝土柱在反复荷载作用下的受力分析以及与试验结果的对比,OpenSEES的模拟结果能更全面反映柱的滞回曲线的整体特性,因此对于压弯受力特征的钢筋混凝土柱建议采用OpenSEES进行反复荷载作用下的非线性分析。

In this paper,the finite element software ABAQUS and OpenSEES were adopted to simulate a rein-forced concrete column,which was tested in Kawashima Earthquake Engineering Laboratory.For the ABAQUS model,a separate model is constructed by using solid elements for concrete model and truss elements for steel model.The concrete damaged plasticity model was used to consider the concrete constitutive relation-ship and the damage factor was calculated based on the principles of energy loss.The stress-strain relationship of the steel bar was simulated by the uniaxial constitutive relationship in which the degradation of the stiff of the reloading was assumed to obey the Clough′s kinematic hardening model.Through the embed technology, the degree of freedom was coupled.In the OpenSEES,the dispBeamColumn element was used to simulate the column and the Concrete01 model was adopted to consider the concrete constitutive relationship which was modified through the Mander model to consider the influence of stirrup.The Steel02 model was used to consid-er the constitutive relationship of steel bar.Through the comparison of the analysis results,it is found that the simulation results from the OpenSEES is closer to the actual experimental results.Therefore,it is suggested that the OpenSEES can be adopted to analyze the nonlinear performance of reinforced concrete column under cyclic loading.