摘要
端部锚固预应力碳纤维增复合板(Carbon Fiber Reinforcement Polymer Laminate,简称CFRP板)加固钢筋混凝土结构目前最为常见的抗弯加固方式,为探讨端部锚固CFRP加固RC梁IC剥离过程的起始和演化,文章基于部分黏结作用复合梁理论,利用内聚力开裂模型模拟界面层的剥离过程,通过引入含残余强度的四线性黏结滑移本构模型模拟CFRP板与钢筋混凝土梁之间相对滑移带来的界面的变形协调和应力变形行为的非线性特征和软化特性,得到单一裂缝模式下中间裂缝剥离过程中相应的界面黏结剪应力,相对滑移量、CFRP板轴力分布以及加固构件整体荷载-跨中位移,荷载-跨中CFRP板应变的响应曲线,并与文献提供的试验数据进行对比。结果表明,理论计算结果与试验结果基本一致,可以反映端部锚固CFRP板加固混凝土梁的实际受力状态,为端部锚固CFRP板加固混凝土梁的受力分析和设计提供了理论参考。
The end-anchored CFRP plates or sheets has emerged as a popular method of strengthening reinforced concrete structures.In this study,the interface bond shear stress,relative slip,axial force distribution of the CFRP plate,the overall load-displacement and the load-CFRP plate strain response curve during single-crack debonding process is addressed by means of the cohesive crack model and the Partial-Interaction composite beam theory,by introducing a four-linear bond-slip constitutive model with residual strength to reflect the nonlinear and softening characteristics of deformation compatibility and stress-deformation behavior of interface produced from relative slip between CFRP plate and reinforced concrete beam.It is observed that the theoretical values of structural behavior basically agree with the experimental values,reflecting the actual stress state of concrete beams strengthened by the end-anchored CFRP plates.The results in the present study provide theoretical references for the analysis and design of the concrete beams strengthened by the end-anchored CFRP plates.
作者
王珍珍
周智
白石
欧进萍
Wang Zhenzhen;Zhou Zhi;Bai Shi;Ou Jinping(School of Civil Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Zhixing Smart and Technology Co.,Ltd.,Nantong 226000,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第1期1-11,共11页
China Civil Engineering Journal
基金
国家重点研发计划(2018FYC0705606)
国家重点研发计划(2017YFC0703008)
