论文部分内容阅读
为解决含裂纹混凝土强度的预测问题,以断裂力学与细观力学相结合的方法,在混凝土双K断裂准则的基础上,提出了混凝土裂纹演化方程,给出混凝土裂纹特征尺寸随应力变化的表达式,由此得到了含裂纹混凝土材料的损伤本构关系。在此基础上,对含有裂纹的损伤混凝土强度进行了预测,与已有细观试验结果进行对比,表明该方法具有足够的精确度,此后重点讨论了裂纹角度对混凝土强度的影响。此方法可为混凝土结构中损伤混凝土的性能评估奠定一定的基础。
In order to solve the problem of predicting the strength of cracked concrete, the crack propagation equation of concrete is proposed based on the double K fracture criterion of concrete with the combination of fracture mechanics and meso mechanics. The expression of crack size of concrete with the change of stress is given Thus, the damage constitutive relation of cracked concrete is obtained. On this basis, the strength of cracked concrete is predicted, and compared with the results of the existing meso-scale test. The results show that this method has enough accuracy. After that, the influence of crack angle on the strength of concrete is discussed. This method can lay a solid foundation for the performance evaluation of damaged concrete in concrete structures.