混凝土-环氧树脂粘结界面的断裂模拟

Fracture Simulation of Concrete-epoxy Bonding Interface

在混凝土加固工程中,常采用环氧树脂等混凝土灌浆材料进行混凝土裂缝修复,会形成混凝土与环氧树脂的粘结界面。界面的强度影响结合材料强度,对界面性能的研究至关重要。基于ABAQUS采用内聚力单元和扩展有限元单元分别模拟界面断裂与混凝土断裂,以此研究含界面的混凝土断裂问题。讨论了界面粘结强度、混凝土抗拉强度、混凝土断裂能对含界面的楔入劈拉试件受力性能的影响。模拟结果表明,不仅数值分析结果与实验结果吻合较好,而且还能表现界面的损伤、断裂破坏过程,能够预测构件的承载力,有助于界面的优化设计。

Concrete grouting materials such as epoxy resin are more and more widely used to repair concrete cracks.A bonding interface between the epoxy resin and concrete or between new and old concrete is formed.The bond strength of the interface is the main factor affecting the strength of the composite materials.Therefore,the study of the interfacial properties is very important.This paper adopted the cohesive element and the extended finite element in ABAQUS to simulate interface fracture and concrete fracture.The influence of the cohesive strength of interface,the concrete tensile strength and the fracture energy on the wedge splitting specimen performance were discussed in detail.The results presented in this study are helpful for studying interface fracture process,predicting the load-carrying capacity and ductility,and optimizing the interface design.