基于界面塑性断裂模型的碾压混凝土诱导缝问题分析

摘要

对于碾压混凝土诱导缝，基于经典塑性理论，将黏聚力裂纹模型扩展到 I 型和复合型断裂问题，通过数值模拟对不同层面处理方式所形成的碾压混凝土层面的断裂问题进行了分析。分析结果预测出了试验所得的预留诱导缝试件控制点处的荷载－位移曲线，并分析了各种工况形成层面的损伤断裂机理，分析结果为碾压混凝土相应层面的 I 型、I － II 复合型断裂提供了判据，为相关问题的分析提供了理论指导。%According to the induced crack of RCC ,a numerical procedure based on the cohesive crack approach and the formulation of the classical plasticity is presented ,and then is extended to mode I and mixed mode I - II fracture prob-lem .The crack model is performed on the RCC layers formed by different processing ways .According to test database and finite element analysis ,the damage fracture mechanism of layer surface resulted from various cases was investigated , the curves of the load versus displacement at several control points of the specimens are well predicted .This method pro-vides a theoretical guidance for the related problems .