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基于细观统计损伤理论及宏观试验现象,本文建立了混凝土双轴拉-压细观统计损伤本构模型.该模型考虑断裂、屈服两种细观拉损伤模式,损伤演化过程由主方向的拉、压应变驱动.将单轴拉伸、单轴压缩作为两种最基本的宏观破坏形式,复杂应力状态下的损伤破坏过程理解为单轴拉伸、压缩损伤演化过程的某种组合形式.引入等效传递拉损伤应变和损伤影响参数,建立宏观拉、压破坏模式对应细观损伤机制之间的等效关系.通过与试验结果比较,表明该模型能够很好地模拟双轴拉-压加载情况下材料均匀损伤阶段的力学行为.对双轴拉-压比例加载路径下应力-应变曲线进行预测,提取出双轴拉压强度包络线,从双轴强度、变形特性、破坏形态等角度对材料的双轴拉-压损伤机制进行探讨.
Based on meso-statistical damage theory and macroscopic experimental phenomena, a constitutive model of biaxial tension-compression meso-observational damage of concrete is established in this paper. The model considers two kinds of meso-pull damage modes of fracture and yield. The damage evolution process , And compressive strain drive.With the uniaxial tension and uniaxial compression as the most basic form of macroscopic failure, the damage and failure process in complex stress state is understood as some combination of uniaxial tension and compression damage evolution. Equivalent transmission tensile damage strain and damage impact parameters, the establishment of macroscopic tension and compression failure mode corresponding to the relationship between the mesoscopic damage mechanism.Compared with the experimental results show that the model can well simulate the biaxial pull-pressure loading The stress-strain curve under biaxial tension-compression proportional loading is predicted, and the biaxial tensile strength envelope is extracted. From the aspects of biaxial strength, deformation characteristics and failure modes The biaxial tension-compression damage mechanism of the material is discussed.