高速铁路大跨度桥梁变形对线路平顺度的影响分析

Analysis on Influence of Long-span High Speed Railway Bridge Deformation on Line Smoothness

本文初步分析了高速铁路大跨度桥梁的竖向挠度、梁体结构、伸缩量、转角、错台差等参数与线路平顺度的关系。结果表明:随着桥梁跨度的增大,跨中线形平顺性呈提高的趋势;大跨度桥梁宜采用相同的梁体结构形式;邻跨与主跨的长度比值越大,主墩处线形平顺性越好;梁端轨道系统设计不宜考虑地震引起的梁缝宽度变化;大跨度桥梁上宜采用无砟轨道,若采用有砟轨道宜提高边跨梁端的变形控制标准;大跨度桥梁应尽量设置在平坡或小坡度上,如果设置在大坡度上宜采用斜坡支座。同时,提出了大跨度桥梁静态线形验收和动态线形评价方法存在的不足之处,需进一步研究。

This paper preliminarily analyzes the relationship between the vertical deflection,beam structure,expansion,rotation angle,staggering difference and line smoothness of long-span high speed railway bridge. The results show that with the increase of the bridge span,the smoothness of the mid-span alignment is improving. The same beam structure should be adopted for long-span bridges. The greater the length ratio of the adjacent span to the main span,the better the line smoothness of the main pier. The change of beam joint width caused by earthquake should not be considered in the design of beam end track system. Ballastless track should be used for long-span bridges. If ballasted track is used,the deformation control standard of side span beam end should be improved. Long span bridges should be set on flat slopes or small slopes as far as possible. If bridge is set on large slopes,slope bearings should be used. At the same time,the shortcomings of static alignment acceptance and dynamic alignment evaluation methods of long-span bridges are proposed,which should be further studied.