一个钢筋混凝土损伤塑性本构模型及工程应用

以ABAQUS大型程序为平台,采用应变协调假设和强度等效假设,给出了一个描述钢筋混凝土材料与结构损伤塑性分析的本构模型。这里的钢筋强化特性是通过定义强化了的拉伸塑性应力-应变曲线来实现的。模型中的钢筋不再以独立的金属材料形式出现,而是被等效钢筋混凝土代表体元模型包含进去了,用拉伸应力-应变曲线峰值后区的硬化-软化强度曲线直接定义强化功能。这个模型着重对ABAQUS软件中给出的损伤塑性模型的拉伸强化-软化阶段的特性进行了完善。采用试件受单向拉伸和简支梁受集中力载荷两个简单算例说明了模型的有效性。最后该研究将这个模型用于一个受地表堆积载荷、土压力和地下水压力联合作用下的钢筋混凝土墙体结构的ABAQUS有限元损伤塑性数值分析中。

A DAMAGE PLASTIC CONSTITUTIVE MODEL FOR REINFORCED CONCRETE AND ITS ENGINEERING APPLICATION

A damage-plastic constitutive model for reinforced concrete is proposed by applying a Representative Volume Element (RVE). Assumptions of strain harmony and equivalent strength are adopted. The property of reinforcement within the RVE is modeled by defining hardening-softening law of the stress-strain curve of the Representative Volume Element. And the Representative Volume Element is taken as a uniform continuum. The model proposed here has enriched the library of models for concrete under tension in ABAQUS software. For the purpose of validation, numerical examples of uniaxial tension and simple-supported beam under bending were presented. Application of the model to the elastoplastic damage analysis of an engineering structure of reinforced concrete under soil pressure and underground water pressure was carried out.