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为研究钢桁梁梁端横向伸缩对有砟轨道几何形位的影响规律,运用有限单元法,建立线-桥横向分析的计算模型,对在日温差作用下钢桁梁梁端相对路基伸缩时有砟轨道几何形位的变化及其影响因素进行分析。结果表明,钢桁梁相对路基发生横向伸缩后会使有砟轨道线路产生较大的横向位移和方向变化率,但对轨距影响不明显;梁端伸缩时,道床、扣件横向阻力对轨道横向位移的影响很小,且其增大到正常值之后,轨道方向变化率受其影响也很小;钢桁梁横向固定支座和线路中线间的距离是影响轨道几何形位变化的主要因素,当其控制在6.7 m以内时,轨道的最大横向位移小于2 mm,方向不平顺变化率小于1‰。
In order to study the influence of transverse telescoping on the geometrical position of ballast track, the finite element method was used to establish the calculation model of the transverse analysis of the line-bridge. When the girder end of the steel trussed girder was expanded and contracted under the effect of daily temperature difference The change of the orbital geometry and its influencing factors were analyzed. The results show that the lateral expansion and contraction of the steel trussed girder relative to the embankment will result in large horizontal displacement and directional change rate of the ballasted track, but the influence on the gauge is not obvious. When the beam ends telescope, The influence of lateral displacement is small, and the change of orbital direction change rate is also very small after it is increased to normal value. The distance between the steel truss girder transversely fixed support and the line centerline is the main factor that affects the change of orbit geometry When the control is within 6.7 m, the maximum horizontal displacement of the orbit is less than 2 mm, and the rate of change of direction is less than 1 ‰.