公铁两用悬索桥可靠度分析

Reliability Analysis of Dual Purpose Suspension Bridge of Railway and Highway

为验证文献[1]以五峰山长江大桥为研究背景提出的公铁两用悬索桥多线列车荷载折减系数和文献[2]提出的汽车荷载和风荷载组合值系数的合理性,对五峰山长江大桥和刚好满足铁路桥梁设计规范要求时公铁两用悬索桥吊索和主缆的可靠度进行了分析。分析结果表明:基于上述系数计算的五峰山长江大桥吊索和主缆的可靠指标为7.8和8.6;当只考虑桥梁上的列车荷载、按照文献[1]提出的多线列车荷载折减系数和铁路桥梁设计规范表达式进行设计时,两线、三线和四线悬索桥吊索和主缆的可靠度水平是一致的;同样,当考虑列车荷载与汽车荷载组合及列车荷载与汽车荷载和风荷载组合、按照文献[2]提出的汽车荷载和风荷载组合值系数与铁路桥梁设计规范表达式进行设计时,悬索桥吊索和主缆的可靠度水平是一致的。

In order to verify the rationality of the multi-track train load reduction factor of the dual purpose suspension bridge of highway and railway that proposed in the literature[1]with the Wufengshan Yangtze River Bridge as the research background,and the combined value coefficients of the automobile load and wind load proposed in the literature[2],the reliability of the slings and main cables of the the Wufengshan Yangtze River Bridge and of the road-rail suspension bridge when the bridge just meets the requirements of the railway bridge design code are analyzed.The analysis results show that the reliability indexes of the slings and main cables of the Wufengshan Yangtze River Bridge calculated based on the above coefficients are 7.8 and 8.6;when only considering the train load on the bridge,the multi-track train load reduction factor that proposed in the literature [1]and the expressions in the railway bridge design specification,the reliability levels of the slings and main cables of the two-line,three-line and fourline suspension bridges are the same;similarly,when considering the combination of train load and automobile load,the combination of train load and automobile load as well as wind load,the combination value coefficients of automobile load and wind load proposed in literature[2]and the standard expression in railway bridge design specification,the reliability levels of suspension bridge slings and main cables are consistent.