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针对传统等效裂缝模型无法与细观损伤理论联系起来,多尺度分析裂缝开展的问题.采用以挠度为自变量的三点弯曲梁损伤计算方法,依据宏观断裂力学和细观损伤理论,根据两参数的Weibull分布理论,将细观损伤本构模型运用描述宏观断裂力学行为,并建立改进的混凝土梁开裂模型.并结合三点弯曲梁试验数据,同时利用ANSYS分析软件对开裂过程进行数值模拟.研究结果表明:采用改进的混凝土梁开裂模型数值模拟结果和试验数据吻合良好,表明该模型能准确描述混凝土梁的开裂,可以作为评价混凝土梁开裂与否的理论判据.
In view of the fact that the traditional equivalent crack model can not be linked with the theory of meso-damage, the problem of crack initiation is analyzed at multiple scales.A method of calculating the three-point bending beam damage with deflection as the independent variable is proposed. According to the macroscopic fracture mechanics and meso- Weibull distribution theory is used to describe the macroscopic fracture mechanics behavior of the mesostructural damage constitutive model, and an improved crack model of the concrete beam is established. Combined with the test data of the three-point bending beam, the cracking process is simulated by ANSYS software. The results show that the numerical simulation results of the improved concrete beam cracking model are in good agreement with the experimental data, which shows that the model can accurately describe the cracking of concrete beams and can be used as a theoretical criterion to evaluate the cracking of concrete beams.