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混凝土材料的宏观力学特性及破坏机理由其细观组分来决定,界面过渡区是影响混凝土断裂破坏路径及宏观力学特性的重要因素。认为界面过渡区是区别于远处砂浆基质的一层含较高孔隙率的近场砂浆材料,采用“两步等效法”得到了混凝土细观单元的等效本构关系模型。最后基于细观单元等效化方法分析了在单轴拉伸、单轴压缩及弯拉载荷条件下混凝土试件的破坏过程及宏观力学性质,探讨了界面过渡区对混凝土力学特性的影响,并与随机骨料模型分析结果进行了对比。结果表明:界面相的存在对混凝土的弹性模量、强度及残余强度等力学性质有很大影响,在对混凝土宏观力学特性及细观断裂破坏过程进行研究时不可忽略其影响。
The macroscopic mechanical properties and failure mechanism of concrete are determined by their meso-components. The transition zone of interface is an important factor that affects the failure path and macroscopic mechanical properties of concrete. The interfacial transition zone is considered to be a layer of near-field mortar material with higher porosity which is different from the mortar matrix in the distance. The equivalent constitutive model of concrete mesoscopic unit is obtained by the “two-step equivalent method”. Finally, the failure process and macroscopic mechanical properties of concrete specimens under uniaxial tension, uniaxial compression and bending load were analyzed based on the meso-element equivalent method. The influence of interface transition zone on the mechanical properties of concrete was also discussed. Compared with the results of random aggregate model analysis. The results show that the presence of interfacial phase has great influence on the mechanical properties such as the elastic modulus, strength and residual strength of concrete. The macroscopic mechanical properties of concrete and the failure process of meso-fracture should not be neglected.