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郑晓光1 , 孙鸿飞2 , 李航繁2 , 张家瑞2,3

(1. 国能朔黄铁路发展有限责任公司原平分公司 , 忻州   034000;

2. 石家庄铁道大学 土木工程学院 , 石家庄   050043;

3. 中国铁路北京局集团有限公司天津工务段 , 天津   300011)

摘  要: 为研究线梁偏心对小半径曲线桥梁承载能力的影响 , 以某小半径曲线桥梁  (专桥-2059) 为研究对象 , 采用理论模型与数值仿真的方法 , 开展不同工况下线梁偏心对曲线桥梁正截面抗弯及斜截面抗剪承载能力影响分析 , 并反推出各工况下的临界线梁偏心值 。结果表明 : 相较于原设计状况 , 现状偏心值  ( 向内偏心330 mm) 对曲线桥梁抗弯 、抗剪承载能力均有不利影响 , 其中 , 桥梁抗弯 、抗剪承载能力最大降幅分别为17. 54%、17. 04% ; 在最不利工况下 , 现状使用阶段的曲线桥梁剪力检定承载系数为 0. 969, 低于现行规范 1. 00的限值要求 ; 在不同超高情况下 , 内主梁弯矩 、剪力检定承载系数随列车速度提升呈正相关性 , 而当列车运行速度恒定时 , 其均随线路超高值的增大而呈现负相关特性 ; 曲线桥梁临界偏心值受其抗剪承载能力控制 , 其中最小临界线梁偏心值为向内 314 mm。研究揭示了线梁偏心影响规律及临界值 , 为该类桥梁设计优化与运营维护提供关键参数支撑 , 对工程实践具有重要参考价值。

关键词: 重载铁路 ; 小半径曲线 ; 铁路桥梁 ; 线梁偏心 ; 承载能力 ; 临界偏心值

中图分类号: U239. 4; U448. 35      文献标志码: A      文章编号: 1005-8249 (2026) 05-0139-08

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 05. 021

 

ZHENG Xiaoguang¹ , SUN Hongfei² , LI Hangfan² , Zhang Jiarui^2,3

(1. Yuanping Branch of Guoneng Shuohuang Railway Development Co. , Ltd. , Xinzhou 034000, China;

2. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;

3. Tianjin Engineering Section of China Railway Beijing Group Co. , Ltd. , Tianjin 300011, China)

Abstract : In order to study the effect of line beam eccentricity on the load carrying capacity of small radius curved bridges, a small radius curved bridge ( Special Bridge - 2059) is taken as the research object, and theoretical modeling and numerical simulation methods are used to carry out the analysis of the effect of line beam eccentricity on the bending and diagonal shear load carrying capacity of curved bridges in normal cross-section under different working conditions, and to invert the critical line beam eccentricity value under each working condition.  The results show that compared with the original design condition, the current eccentricity value (inward eccentricity of 330 mm) has an unfavorable effect on the flexural and shear load capacity of curved bridges, in which the maximum reduction of the flexural and shear load capacity of bridges is 17. 54% and 17. 04% ,

   respectively; in the most unfavorable condition , the shear check load factor of curved bridges in the current use stage is 0. 969 , which is lower than the limit value of 1. 00 of the current specification; in the most unfavorable condition , the check load factor of curved bridges in the current use stage is 0. 969 , which  is lower than the limit value of 1. 00  of the current  specification. Under the most unfavorable working condition , the shear capacity of the curved bridge is 0. 969 , which is lower than the limit value of 1. 00;  under  different  super - high  conditions ,  the  bending  moment  of  the  inner main girder and the shear capacity checking coefficient are positively correlated with the increase of the train speed , and when the train speed is constant , they are negatively correlated with the increase of the super-high value of the line ; the critical eccentricity of curved bridges is controlled by the shear load bearing capacity , and the smallest critical line girder eccentricity value is 314 mm inward.

Key words :  heavy  haul  railway;  sharp  radius  curve ;  railroad  bridge ;  line  beam  eccentricity;  bearing  capacity;  critical eccentricity value

项目来源 : 河北省重点研发计划 (20375410D)。

作者简介 : 郑晓光 (1997—) , 男, 硕士, 助理工程师, 研究方向 : 重载铁路运营维修。

收稿日期 : 2025-04-19