论文部分内容阅读
在混凝土微平面本构模型M2的基础上,将微平面上的应力分解为体、偏、剪三个分量,与原有模型定义的微平面各分量应力-应变关系不同,通过分析各个分量的物理意义,定义了相应的应力-应变关系函数,即理想弹塑性函数。引入了破断应变的概念,当微平面应变达到破断应变后应力减为零。在此基础上,提出了钢钎维微平面模型,使得模型可以考虑钢纤维对混凝土的加强作用,并对已有单轴压缩和单轴拉伸试验数据进行拟合,结果表明,微平面本构模型能够较好模拟混凝土应力软化段,初步验证了本文所建议模型的合理性和正确性。
Based on the constitutive model M2 of concrete, the stresses on the micro-plane are decomposed into three components of body, partial shear and shear, which are different from the stress-strain relationships of each component of the micro-plane defined by the original model. Physical meaning, defines the corresponding stress-strain relationship function, that is, the ideal elastoplastic function. The concept of breaking strain is introduced, and the stress is reduced to zero when the micro-plane strain reaches the breaking strain. On this basis, the micro-plane model of steel brazing microstructure is proposed so that the model can consider the reinforcing effect of steel fiber on concrete. The data of uniaxial compression and uniaxial tensile test are fitted. The results show that micro- The model can simulate the stress softening section of concrete well, which proves the rationality and correctness of the proposed model.