考虑加载历史的高速铁路梁轨相互作用分析

发布时间：2018-04-15 06:10

本文选题：铁路桥梁 + 高速铁路　；参考：《铁道学报》2014年06期

【摘要】：目前大多数梁轨相互作用研究中并未考虑加载历史的影响,本文推导了考虑加载历史的线路纵向阻力表达式,与梁轨相对位移的微分方程联立,迭代求解钢轨纵向力和墩台水平力,计算结果更贴近实际情况。以高速铁路简支梁桥、连续梁桥和独塔斜拉桥为算例,采用考虑加载历史的荷载步法计算挠曲力和制动力,并与影响线及逐跨加载法进行对比。分析在梁体温度变形基础上各纵向力的计算方法,并与数值相加的结果进行比较。研究表明,逐跨加载法误差较大,影响线法计算钢轨纵向力结果虽偏安全,但其计算出的墩顶水平力比实际结果小10%~40%;通过单独计算钢轨纵向力并数值相加来检算钢轨时,应考虑伸缩力或制动力系数为-1时的情况;检算墩台时采用数值相加法有时会比实际结果小40%。
[Abstract]:At present, the influence of loading history is not considered in most researches on beam-rail interaction. In this paper, the expression of longitudinal resistance considering loading history is derived, which is in conjunction with the differential equation of the relative displacement of beam and rail.The longitudinal force of rail and horizontal force of pier and abutment are solved iteratively, and the results are closer to the actual situation.Taking simple supported beam bridge, continuous beam bridge and single tower cable-stayed bridge as examples, the flexural force and braking force are calculated by using load step method considering loading history, and compared with the influence line and the method of one-span loading.The calculation methods of longitudinal forces on the basis of temperature deformation of beam are analyzed and compared with the results of numerical addition.The results show that the error of the method is large, and the calculation of longitudinal force of rail by the influence line method is safe, but the horizontal force of the pier top calculated by the method is 100.400.When the longitudinal force of rail is calculated separately and added numerically, the rail is checked and calculated.The extensional force or braking force coefficient should be considered to be -1, and the numerical addition method used in checking the pier and abutment will sometimes be 40 less than the actual result.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金(51378503)
【分类号】：U441.7

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