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对普通强度高性能混凝土(以下简称为普强高性能混凝土)的棱柱体试件进行了拉、压破坏过程的试验研究;在典型材料损伤模型研究的基础上,考虑普强高性能混凝土材料组分的影响,采用抛物面形式的损伤面,提出了适用于普强高性能混凝土单轴受拉和受压脆性损伤的本构模型;在与试验结果对比分析的基础上,对混凝土单轴受拉的泊松比和损伤值进行了探讨。研究结果表明普强高性能混凝土受拉的弹性强度σA大于普强混凝土;普强高性能混凝土受压的峰值应力所对应的应变与普强混凝土也有显著不同,其破裂特征也有别于普通混凝土;所建立的脆性损伤本构模型在精简参数的基础上与试验结果吻合良好,可作为普强高性能混凝土多轴受力试验和损伤模型分析的基础,并对进行普强高性能混凝土结构的损伤分析具有较重要的意义。
Based on the study of the typical material damage model, considering the behavior of Puqiang high-performance concrete material group The constitutive model of brittleness damage caused by uniaxial tension and compression of Pu-Qiang high-performance concrete is proposed based on the paraboloid-shaped damage surface. Based on the comparison with the test results, the uniaxial tension of concrete Poisson’s ratio and damage value were discussed. The results show that the tensile strength σA of Puqiang high-performance concrete is larger than that of general-purpose concrete; the peak strain of Pu-pumped high-performance concrete is also significantly different from that of generalized concrete, and its fracture characteristics are also different from ordinary concrete; The constitutive model of brittle damage established on the basis of the simplified parameters is in good agreement with the test results and can be used as the basis for the analysis of multi-axial stress tests and damage models of Pu-Qiang high-performance concrete. The damage of Pu-Qiang high-performance concrete structures Analysis is more important.