Abstract

This paper presents the problem of assessing degradation process of a selected railway steel bridge in the final period of its operation. Changes in the technical condition of the analysed steel railway bridge in time on the basis of special inspections carried out in 2009–2014 are investigated. The methodology for conducting steel railway bridge assessment in an engineering approach is being presented taking into account conclusions and results from the subsequent special inspections. Moreover, the results of fatigue analysis and assessment of the steel railway bridge, which was put in service in 1933 are discussed. In order to conduct the fatigue analysis and assessment, the deflection of the structure under moving load is measured, as well as the geometry of the structural elements in the support zone is verified. The impact of rolling stock, in particular heavy freight transport, on the bridge degradation process is indicated. It is found that dynamic effects induced by the freight rolling stock reveal a big influence on the rate of fatigue damage process of the bridge. Additionally, the degradation of the considered railway bridge due to the effect of track misalignment is taken into account. Furthermore, the impact of corrosion damage and fatigue on the distribution of stresses in the bridge structure is also discussed.

摘要

本文提出了评估所选铁路钢桥在其运营最后阶段的退化过程的问题。在2009-2014年开展的专项检查的基础上，对被分析的铁路钢桥技术状况的及时变化情况进行了调查。考虑到后续专项检查的结论和结果，正在介绍以工程方法进行铁路钢桥评估的方法。此外，还讨论了 1933 年投入使用的铁路钢桥的疲劳分析和评估结果。为了进行疲劳分析和评估，测量结构在移动载荷下的挠度，并验证支撑区结构元件的几何形状。机车车辆的影响，特别是重型货物运输，在桥梁退化过程中表现出来。结果发现，由货运机车车辆引起的动力效应对桥梁的疲劳损伤过程有很大影响。此外，由于轨道未对准的影响，所考虑的铁路桥的退化也被考虑在内。此外，还讨论了腐蚀损伤和疲劳对桥梁结构应力分布的影响。