铁路斜拉索疲劳强度设计值研究

Research on Design Value of Fatigue Strength of Railway Stay Cable

我国现行规范中一直缺少斜拉索疲劳强度设计值的相关规定,设计中一般以拉索的疲劳试验应力幅为基准并留取一定的富余量作为拉索疲劳强度设计值。为了给斜拉索疲劳强度的设计提供指导,在调研国内外相关文献的基础上,研究和分析了欧洲、日本等国设计规范的斜拉索疲劳设计强度取值方法,并结合我国斜拉桥拉索疲劳应力的实际取值,给出了铁路斜拉索疲劳强度设计值的建议,可指导铁路斜拉桥斜拉索的疲劳设计。

There is a lack of relevant regulations on the fatigue strength design value of stay cables.In the design,the fatigue test stress amplitude of the cable is generally used as the benchmark and a certain margin is reserved as the design value of the cable fatigue strength.In order to provide guidance for the fatigue strength design of stay cables,the design methods of fatigue strength of stay cables in the design codes of Europe,Japan and other countries are studied and analyzed based on the investigation of relevant domestic and foreign documents.Combined with the actual value of the fatigue stress of cable-stayed bridges in our country,recommendations for the fatigue strength design value of railway stay cables are given,which can guide the fatigue design of stay cables of railway cable-stayed bridges.