宜万铁路特殊结构桥梁动力特性及列车走行性分析

宜万铁路全线共有桥梁195座,其中特殊结构桥梁26座,特殊结构桥梁形式主要有复合结构刚构拱桥、双线大跨度上承拱桥、大跨度连续梁桥、非对称拱桥、大跨度“T”构桥、大跨度简支梁桥、大跨度连续刚构桥、单拱连续钢桁梁桥等。目前国内外规范对桥梁设计关于桥梁刚度限值的规定只适用于单跨和多跨简支梁等小跨度常规桥梁,上述特殊结构桥梁都超出了目前我国各种规范和暂规所能涵盖的范围,它们的修建对我国铁路桥梁的设计和建造技术都提出了新的要求,本文选取几座有代表性的特殊结构桥梁为研究对象,对各桥的动力特性和列车走行性进行分析与研究,以期对宜万铁路特殊结构桥梁设计中关于桥梁刚度的考虑提供理论参考。

Dynamic characteristic and train running performance of particular bridges on Yiwan railway line

The whole line of Yiwan railway has 195 bridges total,in which the number of particular bridges is 26.The types of these particular bridges mainly contain composite structural frame-arch bridges,double-line long span deck arch bridges,long span continuous bridges,non-symmetric arch bridges,long span T-type bridges,long span simply supported bridges,long span continuous frame bridges,and continuous steel truss bridge with single arch.At present,the domestic and foreign code temporary standard for bridge design only are suitable for general short span bridges such as simply supported bridge with single or multiple spans.The above particular bridges are beyond the structures to which the present code or temporary standard in our country can adapt.Their construction makes new requirements to the design and construction technology of railway bridges in our country.Several representative special structure bridges were chosen to study,analysis and research of the dynamic characteristic and train running performance of each bridge.It provides theory references to the consideration of stiffness of special structure bridges' design on Yiwan railway line.