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曾慶響1,2，韓大建1
(1 華南理工大學亞熱帶建筑科學國家重點實驗室，廣州510640; 2五邑大學土木建筑學院，江門529020)[摘要] 預應力混凝土梁橋因具有良好的受力性能而在橋梁工程中得到廣泛應用?；炷翗蛄旱拈_裂和撓度過大已經逐步成為普遍現象，橋梁結構的加固改造已經成為學術研究和工程應用的熱點。介紹了橋梁加固設計的基本原則。將橋梁結構的加固方法劃分為主動加固法和被動加固法兩大類。分析了截面增大加固法、粘貼鋼板和纖維復合材料加固法、體外預應力加固法和改變結構體系加固法等的特點與適用范圍?？偨Y了橋梁工程中裂縫處理的常用方法和常用加固材料的力學性能。指出了橋梁工程加崮中應注意的主要問題。
[關鍵詞] 混凝土橋梁；加固；體外預應力；裂縫；纖維復合材料Strengthening and crack treatments for prestressed concrete girder bridges
Zeng Qingxiang1,2, Han Dajian1
(1 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China; 2 School of Civil Engineering & Architecture, Wuyi University, Jiangmen 529020, China)Abstract: Prestressed concrete box girder (PC bridges) is widely applied in bridge engineering for its favorable mechanical performance. Cracking and over-deformation have been beconung the common phenomenon for PC bridges. The problem of structural strengthening for concrete girder bridges is universally concerned in the field of academic research and engineering application in bridge structure engineering. The structural strengthening methods in PC girder are classified into two categories, active strengthening method and passive strengthening method. The features and application scope of some structural strengthening methods, such as structure member strengthening with RC & PC, structure member strengthening with bonded steel plate or fiber reinforced polymer, structure member strengthening with external prestressing, strengthening by changing structure system and so on, are analyzed for PC bridges. Finally, some treatment method of cracks and mechanical properties index of strengthening materials for PC bridges are summarized briefly. Some main problems should be paid attention in structure strengthening are pointed out for the benefit of further strengthening design for PC bridges.
Keywords: prestressed concrete bridge; strengthening; external prestressing; crack; fiber reinforced polymer( FRP)
