重载列车与既有铁路简支梁桥的适应性研究

发布时间：2018-01-13 18:09

本文关键词：重载列车与既有铁路简支梁桥的适应性研究　出处：《铁道科学与工程学报》2014年02期 　论文类型：期刊论文

【摘要】：以既有铁路双线24 m简支梁为例,建立普通铁路简支T梁和高速铁路简支箱梁空间有限元分析模型,分析两者在现行活载模式下的工作性能,将中国货运专线铁路荷载(ZH)组合加至24 m普铁简支T梁和高铁简支箱梁上,研究30 t重载荷载模式下的受力和变形情况,探讨在既有铁路简支梁桥上运行30 t轴重重载列车的可行性。研究结果表明:ZH荷载组合下,24 m普铁简支T梁和高铁简支箱梁抗弯强度系数分别为1.99和1.95,T梁下缘最大拉应力达到0.28 MPa,均无法满足现行铁路桥梁规范。通过比较几种活载模式作用下24 m简支梁的受力特性,提出适用于30 t重载列车的24 m简支T梁和箱梁结构形式。经验算,本文设计的2种简支梁均满足我国现行铁路桥梁规范和重载铁路规范。
[Abstract]:Taking the 24m simply supported beam of the existing railway as an example, the spatial finite element analysis model of the simple supported T beam and the simple supported box girder of the high speed railway is established, and the working performance of the two beams under the current live load mode is analyzed. In this paper, the combined load of ZH on the railway of China freight line is added to the simply supported T beam of 24m ordinary iron and the simply supported box girder of high-speed railway, and the stress and deformation of the railway under 30t heavy load mode are studied. This paper discusses the feasibility of running 30 t axle load heavy haul train on the existing railway simply supported beam bridge. The research results show that under the combined load of 1: ZH. The flexural strength coefficients of simple supported T beam and simple box girder are 1.99 and 1.95 MPa, respectively. The maximum tensile stress is 0.28 MPa. By comparing the mechanical characteristics of 24m simply supported beam under the action of several live load modes. The structural forms of 24 m simply supported T beam and box girder suitable for 30 t heavy haul train are presented. By empirical calculation, the two simply supported beams designed in this paper both meet the current railway bridge code and heavy haul railway code in China.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378503) 高速铁路基础研究联合基金项目(U1334203)
【分类号】：U448.13;U441
【正文快照】： 近年来,我国的重载铁路建设进入了迅速发展的阶段[1-2]。继大秦、大准铁路上成功运行了25 t重载列车后,我国即将建成运行轴重30 t列车的山西中南部铁路和蒙西至华中运煤铁路等重载运输通道[3]。同时针对包神、神朔铁路等重载电气化运煤专线进行技术改造以提高列车轴重[4-5]。

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