大跨径混凝土梁桥体外预应力加固技术  

The Strengthening Technology about External Prestressing of Large Span Concrete Bridge

作　　者：许宏元[1] 宋宁[1] 陈常明[1] 刘士林[1] 

机构地区：[1]中交第一公路勘察设计研究院有限公司,中国陕西西安710075

出　　处：《重庆交通大学学报（自然科学版）》2011年第A02期1192-1196,1211,共6页Journal of Chongqing Jiaotong University(Natural Science)

摘　　要：跨中长期下挠和梁体开裂是大跨径混凝土梁桥的常见病害,病害的存在与发展导致桥梁维修养护费用的大幅增加、破坏桥梁美观、严重影响交通和结构安全。采用体外预应力加固技术受力明确、安全,对抑制跨中下挠、控制裂缝,能起到明显的作用。在分析病害特点及成因基础上,通过对两座主跨超过200 m的刚构桥加固实践的总结,提出了针对性措施和体外预应力体系使用建议,供同行参考。Problems with prestressed long-span concrete bridge in China are beam cracks and time-dependent deflection in midspan,which result in higher cost for bridge maintenance and poor sense of beauty,influence structure durability and traffic safety.External prestressing system adopted for long-span concrete bridge strengthening has obvious effect to control cracks and deflection.Based on the strengthening practice of two bridges with main span of over 200m,This paper puts forward relevant measures and some useful suggestion for external prestressing system.

关 键 词：大跨径混凝土梁桥 跨中下挠 梁体开裂 体外预应力 

分 类 号：U448.35[建筑科学—桥梁与隧道工程] U445.7[交通运输工程—道路与铁道工程]