超高性能混凝土单轴拉压本构关系研究

超高性能混凝土（UHPC）是一种具有超高强度、超高耐久性和超高韧性的新型水泥基复合材料，因其优越的性能而受到国内外土木工程领域的广泛关注，具有广阔的工程应用前景。单轴受拉和受压应力-应变本构模型是进行UHPC构件力学性能分析的前提和基础。为了进一步深入研究UHPC力学性能，本文归纳总结了国内外不同学者提出的UHPC本构模型，包括单轴受压应力-应变关系和单轴受拉应力-应变、应力-裂缝宽度关系，对其进行了分类和比较，发现了现有模型的共同点和存在的差异，并对这种差异进行了原因分析，最后将部分本构关系应用于ABAQUS有限元分析软件，对高强钢筋UHPC梁进行数值模拟，并与试验结果对比，验证了部分本构模型的合理性，最后提出了一些研究结论。本文研究成果将为UHPC的结构性能研究进行结构分析和结构设计提供依据。 

A review on constitutive relationship of ultra-high-performance concrete under uniaxial compression and tension

Ultra-high-performance concrete (UHPC) is a new type of cemetitious composite material with ultra- high strength, ultra-high durability and high toughness. It has received extensive attention in the field of civil engi neering at home and broad because of its superior performance and had a broad prospect of engineering application. The uniaxial tensile and compressive stress-strain constitutive model is the premise and foundation for the analysis of mechanical properties of UHPC members. In order to further study mechanical properties of UHPC, this paper summarized different UHPC constitutive models proposed by domestic and foreign scholars* including uniaxial com pressive stress-strain relationship, uniaxial tensile stress-strain and stress-crack width relationship, and carries on the classification and comparison. Some similarities and differences of existing models are found, and the reasons for this difference were analyzed. In the last part, some constitutive relations were applied to the finite element analysis software ABAQUS. Numerical simulation of UHPC beam reinforced with high strength steel bars was carried out, and the rationality of some constitutive models was verified by comparison with the experimental results. Some con clusions were put forward. The research results of this paper provide a basis for structural performance study, structural analysis and structural design of UHPC.