（1 北京市建筑设计研究院有限公司， 北京 100045； 2 清华大学水利系， 北京 100084）

 ［摘要］在FRP加固混凝土梁的剥离破坏中，由弯曲裂缝引起的剥离破坏是其中的一种主要形式，对于被加固梁中FRP片材与混凝土的协同工作能力有很大影响。通过纤维增强复合材料的桥联力模型，揭示了这种状况下弯曲裂缝发展的断裂阻力性能以及桥联力对FRP片材与混凝土之间的协调工作性能的影响。

［关键词］FRP； 混凝土结构； 桥联力； 剥离破坏； 断裂力学；

中图分类号： TU375.1 文献标识码： A文章编号：  1002-848X(2016)S2-0456-07

Bridge stress behavior of FRP strengthing conctrete

Duan Shichang1, Xu Qianjun2

(1 Beijing Institute of Architectural Design, Beijing 100045, China;

2 Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China)

Abstract: To effectively utilize fiber reinforced plastic (FRP) plates (or sheets) in strengthening civil infrastructures, a design strategy integrating the properties of FRP reinforcement and composite structural behavior needs to be adopted. The bridge stress behavior should be considered to be one of the most important effects on the concrete beam strengthened by FRP. The behaviors were introduced to solve the nonlinear interfacial stress transfer and fracture propagation problems for mechanical character of FRP strengthened concrete beam. Expressions for the driven force, the resistance and the slope of them are derived analytically. In addition, numerical simulations were performed to discuss the factors influencing the interfacial and theoretical derivations were validated.

Keywords: FRP; concrete structure; bridge stress; peeling-off failure; fracture mechanics

作者简介： 段世昌，硕士，高级工程师，工作室主任，国家一级注册结构工程师，Email:13691425807@163.com。