论文部分内容阅读
本文用可靠性理论对预应力混凝土铁路斜拉桥斜缆疲劳可靠性进行了研究。文章首先介绍了国外关于桥梁疲劳可靠性研究的概况,接着用“雨流法”(RainflowCounting Method)分析了红水河桥边跨外缆应力变程(Stress range),从而得该斜缆应力变程分布函数,再经试验得到钢绞线S-N曲线。 然后用Miner法则研究斜缆疲劳寿命、疲劳可靠度及疲劳设计允许应力变程,并以红水河桥边跨外缆为例进行了计算。分析结果可以说明可靠性理论用于疲劳设计的合理性和优越性。
In this paper, the reliability theory of prestressed concrete railway cable-stayed bridge fatigue reliability was studied. The article firstly introduces the foreign survey about fatigue reliability of bridges, and then analyzes the stress range of the cables across the bridge by “Rainflow Counting Method” Process distribution function, and then tested by the strand SN curve. Then Miner’s law is used to study the fatigue life, fatigue reliability and fatigue allowable stress range of inclined cable. The results of the analysis can illustrate the rationality and superiority of reliability theory for fatigue design.