纤维薄板与混凝土界面应力场数值分析

Numerical Analyses of the Stress Field on the interface Between Fiber Sheet and Concrete Member

对碳纤维薄板增强混凝土三点弯曲缺口试件中薄板与混凝土的界面的应力场进行有限元数值分析，并对界面与缺口端部应力场的关系，以及界面的剥离长度对应力场的影响进行了讨论。分析结果表明，纤维薄板与混凝土的界面存在应力集中现象，当纤维薄板与混凝土粘结完好时，构件的强度由界面所控制；当界面发生局部剥离破坏时，剥离长度将是影响构件强度的重要因素。

The stress field on the interface between fiber-sheet and concrete member in a carbon fiber-sheet-reinforced concrete 3-P bending specimen with a V-notch is analyzed by FEM, the relationship of two stress fields on the interface and the V-notch tip, and the effects of debonding length on the stress fields are also discussed. The analysis results show that a new stress concentration on the interface has arisen,and the strength of the member is determined by that of the interface while the bonding is intact,but the debonding length is a key factor for the strength while the local debonding has taken place.