FRP-混凝土界面动态剪切滑移模型  

DYNAMIC SHEAR SLIP MODEL FOR FRP-CONCRETE INTERFACE

作　　者：芦思羽 陈德 吴昊 LU Si-yu;CHEN De;WU Hao(College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《工程力学》2025年第4期167-178,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(52078379)。

摘　　要：纤维增强复合材料(fiber reinforced polymer,FRP)与混凝土粘结界面的动态剪切滑移关系是冲击荷载作用下FRP外贴加固混凝土结构安全评估与设计的基础。基于4组FRP-混凝土界面动态单剪试验数据和有限元分析软件LS-DYNA中*MAT_COHESIVE_MIXED_MODE_ELASTOPLASTIC_RATE材料模型,建立了耦合应变率效应的界面动态剪切滑移模型。进一步基于该模型对另外3组动态单剪试验进行了数值模拟,通过对比界面粘结滑移关系、荷载-位移曲线和FRP应变时程,验证了建立的模型和参数计算方法的适用性。将上述模型应用于FRP加固RC板和梁的落锤冲击试验的数值模拟分析中,并与常用的FRP-混凝土界面接触表征方法(共节点、tiebreak和cohesive)进行了对比。结果表明:共节点方法预测的跨中挠度偏小,而tiebreak和cohesive接触的预测结果偏大,该文建立的界面动态剪切滑移模型预测精度最高。The dynamic shear-slip relationship of FRP-concrete interface is the basis for safety assessment and design of FRP externally strengthened concrete structures under impact loading.A dynamic interfacial shear slip(DISS)model considering strain rate effect is established based on four sets of dynamic single shear test data on FRP-concrete interface and*MAT_COHESIVE_MIXED_MODE_ELASTOPLASTIC_RATE material model in the finite element analysis software LS-DYNA.Numerical simulations based on DISS model are further conducted for three other sets of single shear tests.The applicability of the established model and methods of parameter calculations are verified through the comparisons of interfacial bond stress-slip relationships,loaddisplacement curves and FRP strain time-histories.Numerical simulations of the impact tests on FRP strengthened RC slabs and RC beams are conducted,in which the interface is described by DISS model,and the results are compared with the results of commonly used methods for FRP-concrete interface contact(share nodes,tiebreak and cohesive).It shows that the simulated midspan deflection based on share nodes method is smaller than the test result,while the results of tiebreak and cohesive contact method are larger than the test results,and the results based on DISS model have the highest accuracy.

关 键 词：FRP-混凝土界面 动态剪切滑移模型 冲击 数值模拟 应变率效应 

分 类 号：TU398.5[建筑科学—结构工程]