影响混凝土桥梁结构耐久性的主要因素及防治措施

Main Influence Factors and Preventive Measures of Concrete Bridge Structure Durability

铁路工程结构的条带状分布、露天服役环境、承受疲劳荷载等特征,决定了工程结构耐久性的复杂性。通过系统研究和全面总结工程实践经验,铁路已经形成了比较完备的混凝土结构耐久性技术标准体系。从分析影响铁路混凝土桥梁结构耐久性的主要因素入手,全面介绍各种保证混凝土桥梁耐久性的技术措施,并以时速350 km高速铁路32 m简支箱梁为例,介绍我国铁路混凝土桥梁结构耐久性的成熟经验。

The complexity of railway engineering structural durability is determined by such features as stripped dis- tribution, outdoor environment, fatigue loads subjection of the structure. By comprehensive research and overall summarization of engineering practical experience, a relatively complete technical standards sys- tem of railway concrete durability has been formed. By analyzing the main factors which affect the dura- bility of railway concrete bridge structure, this essay delivers a comprehensive introduction about kinds of technologies and measures which maintain the durability of concrete bridge. At the same time, this essay takes 32m simply supported box girder of 350 km/h - high speed railway as the example to introduce the experience of durability of railway concrete bridge structure in China.