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（1 北京市建筑設(shè)計(jì)研究院有限公司， 北京 100045； 2 清華大學(xué)水利系， 北京 100084）

 ［摘要］在FRP加固混凝土梁的剝離破壞中，由彎曲裂縫引起的剝離破壞是其中的一種主要形式，對(duì)于被加固梁中FRP片材與混凝土的協(xié)同工作能力有很大影響。通過(guò)纖維增強(qiáng)復(fù)合材料的橋聯(lián)力模型，揭示了這種狀況下彎曲裂縫發(fā)展的斷裂阻力性能以及橋聯(lián)力對(duì)FRP片材與混凝土之間的協(xié)調(diào)工作性能的影響。

［關(guān)鍵詞］FRP； 混凝土結(jié)構(gòu)； 橋聯(lián)力； 剝離破壞； 斷裂力學(xué)；

中圖分類號(hào)： TU375.1 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  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

作者簡(jiǎn)介： 段世昌，碩士，高級(jí)工程師，工作室主任，國(guó)家一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email:13691425807@163.com。