中文摘要：

基于局部损伤混凝土模型建立了FRP-混凝土搭接接头的精细有限元模型,对其界面在准静态荷载和动力荷载下的粘结性能进行了研究.将准静态有限元模拟结果与FRP-混凝土搭接接头单剪试验数据进行了比较,同时完成了该局部损伤混凝土模型的各参数分析,详细讨论了混凝土断裂带宽度和断裂能等因素对有限元计算的影响.该模型计算得到的准静态荷载-滑移及应变分布曲线均接近试验结果,且通过数值分析还能详细展示FRP-混凝土界面的损伤、传递及破坏过程,预测构件的静态承载能力和FRP-混凝土粘结滑移行为.在此准静态精细有限元模型基础上引入与应变率相关的混凝土动力增强因子（dynamic increasing factor,DIF）,针对不同加载速率下FRP-混凝土粘结滑移行为进行了初步讨论,指出高加载速率会导致FRP-混凝土界面承载能力的提高和有效搭接长度的增长,并扩大破坏区域的范围.

英文摘要：

A meso-scale finite element model is presented for investigating the FRP-concrete bond behaviour under static and dynamic loadings. It adopts a local concrete damage model. A large number of single shear tests under static pull-off loading were modeled. It is demonstrated that the developed model can satisfactorily simulate the static debonding behaviour, in terms of the load-carrying capacity and the local bond-slip behaviour. A preliminary study of the effect of the dynamic loading rate on the debonding behaviour was also conducted by considering a dynamic increase factor for the concrete strength as a function of strain rate. It is shown that a higher loading rate leads to a higher load-carrying capacity, a longer effective bond length, and a larger damaged area of concrete in the single shear loading scenario.