摘要
为研究纤维增强复合材料(FRP)加固隧道开裂衬砌的阻裂性能,基于近场动力学理论,通过引入界面弱化准则,建立了FRP-钢筋混凝土结构的近场动力学模拟方法,开展了FRP-钢筋混凝土梁四点弯曲试验模拟验证,并对FRP加固隧道开裂衬砌问题进行建模分析,探究了FRP加固宽度与层数对多种开裂衬砌加固性能的影响规律。结果表明:界面脱黏是FRP加固开裂衬砌的主要失效模式;FRP加固宽度和层数与加固性能呈正相关关系,但当加固宽度超过拱底2/3、层数超过2层时,结构加固性能无显著提升;此外,裂缝分布位置与深度对FRP加固性能有显著影响,其中跨中裂缝的加固效果显著优于偏心裂缝;当跨中裂缝高比为1/5时,FRP加固后结构全局损伤指数降低了40.3%,显著提升了结构的阻裂性能。
In order to study the crack-resistance performance of fiber-reinforced composite(FRP)reinforced tunnel cracked lining,based on the peridynamics theory,a peridynamics simulation method for FRP reinforced concrete structures is established by introducing the interface weakening criteria.Four-point bending tests of FRP reinforced concrete beams are conducted to verify the simulation method.The problem of FRP reinforced tunnel cracked lining is modeled and analyzed to explore the influence of FRP reinforcement width and layers on the reinforcement performance of various cracked linings.The results indicate that:Interfacial debonding is the main failure mode of FRP reinforced cracked lining.The width and number of layers of FRP reinforcement are positively correlated with the reinforcement performance.Nevertheless,when the reinforcement width exceeds 2/3 of the arch bottom and the number of layers exceeds 2,the structural reinforcement performance does not significantly improve.In addition,the distribution and depth of cracks have a significant impact on the reinforcement performance of FRP,and the reinforcement effect of mid-span cracks is significantly better than that of eccentric cracks.Moreover,when the height ratio of mid span cracks is 1/5,the global damage index of FRP reinforcement lining decreases by 40.3%,significantly improving the crack resistance performance of the structure.
作者
赵国军
郭成超
王复明
王海波
Zhao Guojun;Guo Chengchao;Wang Fuming;Wang Haibo(School of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,P.R.China;State Key Laboratory for Tunnel Engineering,Guangzhou 510275,P.R.China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai,Guangdong 519000,P.R.China)
出处
《地下空间与工程学报》
北大核心
2025年第6期1916-1926,共11页
Chinese Journal of Underground Space and Engineering
基金
国家重点研发计划(2023YFB2604000)。
关键词
FRP加固
开裂衬砌
近场动力学
加固性能
FRP reinforcement
cracked lining
peridynamics
reinforcement performance
