基于内聚力模型的快速荷载下CFRP-混凝土界面剪切剥离模拟

鉴于纤维增强复合材料(Fiber Reinforced Polymer, FRP)已在混凝土结构加固中普遍应用, 能有效提高结构的承载和变形能力. 为揭示动载作用下FRP-混凝土界面的剥离机理, 本文基于ABAQUS平台, 采用内聚力模型模拟CFRP-混凝土界面层, 实现了快速荷载下CFRP-混凝土界面剥离的高效模拟. 结果表明: CFRP表面应变在加载过程中由加载端向自由端方向传递, 随着加载速率的提高, 界面承载能力也随之提高; 界面峰值剪应力也存在显著的应变率效应; 模拟结果与试验结果基本吻合, 说明了新方法的有效性.

Numerical simulation of interfacial debonding between CFRP and concrete under rapid loading

Externally bonded FRP has been widely used in the reinforcement of concrete structures, effectively improving the bearing capacity and deformation capacity of the structure. In order to reveal the mechanism of interfacial debonding under dynamic load, the interfacial debonding process between CFRP and concrete is effectively simulated by using the cohesive surface model in ABAQUS. Results show that the longitudinal strain of CFRP is transferred from the loading end to the free end during the loading process. The bearing capacity of the interface increases with the strain rate. The peak shear stress of the interface also possesses a significant strain rate effect.The numerical simulations is in good agreement with experimental observations, indicating the effectiveness of the proposed approach.