Steel railway bridges built throughout the twentieth century represent a very important asset in the railway lines of the entire European network. These bridges, despite their advanced age, continue to be part of passenger and freight transport networks, that provide transport to a large part of society. Given their advanced age, these structures are prone to present higher levels of deterioration in spite of the maintenance tasks that are carried out.

The appearance of pathologies in the wheel-rail contact suppose an alteration in the dynamic behavior of the via-vehicle system. This fact gains importance when they appear in bridges, increasing the number of cycles undergone by the structure, breaking down structural elements.

In this paper, the structural dynamic behavior of a metallic bridge with the presence of different pathologies is studied. The study is focused on a metal bridge built during the first half of the twentieth century currently in service. The aim of the article is to evaluate the influence of these elements on the remaining life to fatigue that they present.

整个20世纪建造的钢质铁路桥梁是整个欧洲网络的铁路线中非常重要的资产。这些桥梁尽管年代久远，但仍然是客运和货运网络的一部分，这些网络为社会的很大一部分提供了运输。考虑到它们的高龄，尽管执行了维护任务，但这些结构仍易于出现更高程度的劣化。

轮轨接触中出现的病理现象假设通孔车辆系统的动态行为发生了变化。当它们出现在桥中时，这一事实变得越来越重要，从而增加了结构所经历的循环次数，破坏了结构元素。

在本文中，研究了具有不同病理状态的金属桥梁的结构动力行为。这项研究的重点是目前在使用中的二十世纪上半叶建造的金属桥。本文的目的是评估这些元素对剩余寿命造成的疲劳影响。