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首页> 外文会议>International conference on FRP composites in civil engineering >VARIOUS FRP STRENGTHENING TECHNIQUES FOR RETROFITTING CONCRETE STRUCTURES
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VARIOUS FRP STRENGTHENING TECHNIQUES FOR RETROFITTING CONCRETE STRUCTURES

机译：各种FRP加固技术改装混凝土结构

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The need for repair and strengthening of deteriorated, damaged and substandard infrastructures has become an important challenge worldwide. The demand for increasingly heavier truck loads is forcing bridge owners to upgrade existing structures. In response to the growing need for concrete repair and rehabilitation, an experimental program was conducted to investigate the feasibility of using different strengthening techniques as well as different types of FRP in strengthening concrete members. Three half-scale models of a prestressed concrete bridge were constructed and tested to failure. Five different strengthening techniques were investigated including near surface mounted Leadline bars, C-BAR CFRP bars, CFRP strips as well as externally bonded CFRP sheets and strips. The dimensions of the specimens are 8.5 x 1.2 x 0.4 meters and consisted of one simple span and two overhanging cantilevers. Cost-effectiveness of each of the strengthening techniques considered in this study is presented. To evaluate bond characteristics of the most efficient techniques, a total of 24 concrete beams were constructed and tested under monotonic static loading. Design guidelines for the development length of near surface mounted CFRP bars, strips and externally bonded CFRP sheets used in strengthening concrete beams are proposed. Ultimate capacity as well as failure mechanism of concrete beams strengthened with various FRP techniques are presented.
机译：需要维修和加强恶化，受损和不合标准的基础设施已成为全球的重要挑战。对越来越重的卡车负荷的需求强迫桥梁所有者升级现有结构。为了应对越来越多的具体修复和康复需求，进行了实验计划，以研究使用不同强化技术的可行性以及在加强混凝土构件中的不同类型的FRP。构建并测试了预应力混凝土桥的三种半尺度模型。研究了五种不同的强化技术，包括近表面安装的引线杆，C-Bar CFRP棒，CFRP条以及外部粘合的CFRP片材和条带。样品的尺寸为8.5 x 1.2 x 0.4米，由一个简单的跨度和两个悬垂的悬臂组成。提出了本研究中考虑的每个强化技术的成本效益。为了评估最有效的技术的键特性，在单调静态载荷下构建并测试了总共24个混凝土梁。提出了近地表面安装CFRP条的开发长度的设计指南，用于强化混凝土梁的条带和外部粘合的CFRP板。提出了使用各种FRP技术强化混凝土梁的最终能力和故障机理。

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