高速铁路简支梁基于桥面加速度的基频限值

Fundamental Frequency Limit of Simply⁃supported Girder of High Speed Railway Based on Deck Acceleration

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摘要考虑轻型桥梁结构和轨道结构的发展方向,有必要研究基于桥面加速度的基频限值。采用移动荷载列模型,针对32、40 m跨度高速铁路简支梁在不同质量、不同设计速度下进行车桥动力理论分析,基于桥面加速度评判指标给出了基频限值。研究结果表明:随着梁体自振频率增加,列车作用引起的桥面加速度逐渐减小。相同计算条件下,线质量越大计算得到的桥面加速度越小。对于线质量不大于20 t/m的无砟32 m跨度简支梁、线质量不大于25 t/m的有砟32 m跨度简支梁和线质量不大于5 t/m的无砟40 m跨度简支梁,提出的基于桥面加速度基频限值大于既有规范限值。线质量越小的简支梁,基频限值越大。研究成果可为高速铁路简支梁设计提供参考。 Considering the development direction of light bridge structure and track structure,it is necessary to study the fundamental frequency limit based on the deck acceleration.In this paper,the vehicle-bridge dynamic analysis was carried out for 32 m and 40 m simply-supported girders of different quality and design speed by moving load set model,and the limit value of fundamental frequency was given based on deck acceleration.The analysis results show that with the increase of the natural vibration frequency of the girder,the acceleration of the bridge deck caused by the train decreased gradually.Under the same calculation conditions,the greater the line mass,the smaller the calculated deck acceleration.For ballastless 32 m simply-supported girder with line mass not greater than 20 t/m,ballasted 32 m simplysupported girder with line mass not greater than 25 t/m,and ballastless 40 m simply-supported girder with line mass not greater than 5 t/m,the fundamental frequency limit based on bridge deck acceleration were larger than the limit value of fundamental frequency in the existing code.The smaller the line mass was,the greater the limit value of fundamental frequency was.The research results of this paper could provide reference for the design of simply-supported girder of high speed railway.

作者班新林苏永华李克冰 BAN Xinlin;SU Yonghua;LI Kebing(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区中国铁道科学研究院集团有限公司铁道建筑研究所

出处《铁道建筑》北大核心 2022年第4期60-63,共4页 Railway Engineering

基金国家自然科学基金(71942006,U1934205) 中国铁道科学研究院集团有限公司基金(2020YJ215)。

关键词高速铁路简支梁桥面加速度基频限值线质量车桥动力分析 high speed railway simply-supported girder deck acceleration fundamental frequency limit line mass vehicle-bridge dynamics analysis

分类号 U441.3 [建筑科学—桥梁与隧道工程]

作者简介第一作者:班新林(1984-),男,副研究员,硕士。E-mail:ban-xinlin@163.com。