1.同济大学;2.同济大学建筑设计研究院（集团）有限公司
TU528.572
国家自然科学基金项目（面上项目，重点项目，重大项目）
1.Tongji University;2.Tongji Architectural Design (Group) Co., Lid
本文对超高性能混凝土单轴受拉黏塑性损伤本构模型展开了研究：基于有效应力空间内的黏塑性理论框架，阐明了单轴动力受拉与单轴静力受拉的理论关联，开展了塑性演化和损伤演化的率敏感性研究，揭示了动力受拉状态下的塑性演化准则和损伤演化准则，进一步建立了超高性能混凝土单轴受拉黏塑性损伤本构模型，同时提出了受拉强度动力提高因子的表达式.通过单轴静力受拉试验数据和单轴动力受拉试验数据对提出的单轴受拉黏塑性损伤本构模型进行验证.结果表明，本文提出的模型可以较好地再现超高性能混凝土在单轴受拉状态下的塑性演化、损伤演化和应力应变关系，为超高性能混凝土的非线性分析提供了参考.
In this paper, the uniaxial tensile viscoplastic damage constitutive model of ultra-high performance concrete is investigated. Based on the theoretical framework of viscoplasticity in the effective stress space, the theoretical correlation between uniaxial dynamic tensile and uniaxial static tensile is elucidated, the rate sensitivity study of plasticity evolution and damage evolution is carried out, the plasticity evolution criterion and damage evolution criterion under dynamic tensile state are revealed. On this basis, the uniaxial tensile viscoplastic damage constitutive model of ultra-high performance concrete is further constructed, and the expression for the dynamic improvement factor of tensile strength is proposed. The proposed uniaxial tensile viscoplastic damage constitutive model is verified by uniaxial static tension test data and uniaxial dynamic tension test data. The results show that the model proposed in this paper can better reproduce the plastic evolution, damage evolution and stress-strain relationship of ultra-high performance concrete under uniaxial tensile, which provides a reference for the nonlinear analysis of ultra-high performance concrete.
