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ANALYSES FOR LATERAL DEFLECTION OF RAILROAD TRACK UNDER QUASI-STATIC LOADING

机译:准静态载荷作用下轨道的侧向挠度分析

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摘要

This paper describes analyses to examine the lateral deflection of railroad track subjected to quasi-static loading. Rails are assumed to behave as beams in bending. Movement of the track in the lateral plane is constrained by idealized resistance characteristics, while movement in the vertical plane is resisted by a continuous, linear and elastic foundation. These analyses are based on solving the ordinary differential equations for beam deflections. In certain cases, convenient mathematical expressions may be used to represent idealized lateral resistance characteristics and derive closed-form equations to relate lateral force as a function of track lateral deflection. However, in general, the idealized lateral resistance characteristic may be nonlinear, in which case numerical methods are required to examine the lateral load versus track lateral deflection behavior. In these general cases, a Fourier series technique is used to solve the governing equations numerically. The analysis of track lateral deflection subjected to quasi-static loads may be applied to examine track shift. For example, lateral resistance of track may be measured using Track Lateral Pull Tests (TLPT). The Fourier method is also used to examine the relationship between lateral and vertical wheel loads and track lateral shift.
机译:本文描述了分析以研究准静态载荷作用下铁轨的横向挠度。假定轨道在弯曲时表现得像梁。轨道在侧面的运动受到理想化的阻力特性的限制,而在垂直面上的运动则受到连续,线性和弹性基础的阻碍。这些分析是基于求解光束偏转的常微分方程。在某些情况下,可以使用方便的数学表达式来表示理想的侧向阻力特性,并得出闭合形式的方程式,以将侧向力与轨道侧向挠度相关联。但是,通常,理想的侧向电阻特性可能是非线性的,在这种情况下,需要使用数值方法来检查侧向载荷与轨道侧向偏转行为的关系。在这些一般情况下,使用傅里叶级数技术来数值求解控制方程。准静态载荷作用下的轨道横向挠度分析可用于检验轨道偏移。例如,可以使用轨道横向拉力测试(TLPT)测量轨道的侧向阻力。傅里叶方法还用于检查横向和纵向车轮载荷之间的关系以及履带的横向偏移。

著录项

  • 来源
    《》|2013年|V001T01A007.1-V001T01A007.10|共10页
  • 会议地点 Altoona PA(US)
  • 作者

    David Y. Jeong;

  • 作者单位

    Volpe National Transportation Systems Center US Department of Transportation Cambridge, Massachusetts, USA;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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