二次预应力组合梁及其在公路桥梁中的应用  

Review of Researches on Twice Prestressed Composite Beam and Its Application in Highway Bridge

作　　者：周亚栋[1] 邵旭东[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路交通科技》2013年第11期78-82,88,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50778071)

摘　　要：介绍了二次预应力组合梁的构思、基本原理与特点,阐述了二次预应力组合梁的受力性能、变形性能、结合面徐变应力重分布的研究进展,对二次预应力组合梁在公路桥梁中的应用研究进行了总结分析。指出二次预应力组合梁可以减小预应力混凝土梁的徐变上拱50%以上,从根本上解决减小梁的徐变上拱和提高截面抗裂安全性的矛盾,同时,还可以节约预应力筋10%以上,在公路超薄梁桥、城市立交桥中综合技术经济优势明显;二次预应力组合梁的设计方法、结合面连接方式与构造、结合面抗剪性能、施工技术是进一步研究需要重点解决的问题。The concept, basic principle and characteristics of twice prestressed composite beam are introduced, and the mechanical performance, deformation performance and creep stress re-distribution of interface of twice prestressed composite beam are expounded. Then, the researches of application of twice prestressed composite beam in highway bridge are summarized and analyzed. It is concluded that （ 1 ） the twice prestressed composite beam can decrease creep camber of prestressed concrete beam more than 50%, thus, the contradiction between reducing creep camber and improving the safety of section crack resistance can be well solved; （2） twice prestressed composite beam can save approximately 10% of prestress tendons, and has comprehensive technical and economic advantages in uhra-thin beam highway bridges and urban overpass bridges. The further research of twice prestressed composite beam will be focused on the design method, connection mode, structure and shear performance of the interface, and the construction technology.

关 键 词：桥梁工程 二次预应力组合梁 徐变上拱 结构性能 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]