摘要
预应力混凝土梁桥因具有良好的受力性能而在桥梁工程中得到广泛应用。混凝土桥梁的开裂和挠度过大已经逐步成为普遍现象,桥梁结构的加固改造已经成为学术研究和工程应用的热点。介绍了桥梁加固设计的基本原则。将桥梁结构的加固方法划分为主动加固法和被动加固法两大类。分析了截面增大加固法、粘贴钢板和纤维复合材料加固法、体外预应力加固法和改变结构体系加固法等的特点与适用范围。总结了桥梁工程中裂缝处理的常用方法和常用加固材料的力学性能。指出了桥梁工程加固中应注意的主要问题。
Prestressed concrete box girder(PC bridges) is widely applied in bridge engineering for its favorable mechanical performance.Cracking and over-deformation have been becoming 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.
出处
《建筑结构》
CSCD
北大核心
2010年第S2期316-319,246,共5页
Building Structure
关键词
混凝土桥梁
加固
体外预应力
裂缝
纤维复合材料
prestressed concrete bridge
strengthening
external prestressing
crack
fiber reinforced polymer(FRP)
