Skewed masonry arch railway bridges are common, yet their structural behaviour under typical working loads, along with gradual changes in behaviour due to degradation, can be difficult to determine. This paper aims to address this problem through detailed monitoring of a damaged, skewed masonry arch railway bridge in the UK, which was recently repaired. A comprehensive Structural Health Monitoring system was installed, including an array of fibre-optic Fibre Bragg Grating (FBG) sensors to provide distributed sensing data across a large portion of the bridge. This FBG monitoring data is used, in this paper, to investigate the typical dynamic structural response of the skewed bridge in detail, and to quantify the sensitivity of this response to a range of variables. It is observed that the dynamic bridge response is sensitive to the time of day, which is a proxy for passenger loading, to the train speed, and to temperature. It is also observed that the sensitivity of the response to these variables can be local, in that the response can differ throughout the bridge and be affected by existing local damage. Identifying these trends is important to distinguish additional damage from other effects. The results are also used to evaluate some typical assumptions regarding bridge behaviour, which may be of interest to asset engineers working with skewed masonry arch bridges.

斜砌石拱铁路桥梁很常见，但它们在典型工作载荷下的结构行为以及由于退化导致的行为逐渐变化可能难以确定。本文旨在通过对英国一座最近修复的受损、倾斜的砖石拱形铁路桥的详细监测来解决这个问题。安装了一个全面的结构健康监测系统，包括一系列光纤光纤布拉格光栅 (FBG) 传感器，以在桥梁的大部分区域提供分布式传感数据。在本文中，该 FBG 监测数据用于详细研究斜桥的典型动态结构响应，并量化该响应对一系列变量的敏感性。据观察，动态桥梁响应对一天中的时间很敏感，这是乘客装载、火车速度和温度的代理。还观察到，响应对这些变量的敏感性可能是局部的，因为响应可能在整个桥梁中有所不同，并受现有局部损坏的影响。识别这些趋势对于区分额外损害和其他影响很重要。结果还用于评估关于桥梁行为的一些典型假设，这些假设可能对使用斜砌石拱桥的资产工程师感兴趣。识别这些趋势对于区分额外损害和其他影响很重要。结果还用于评估有关桥梁行为的一些典型假设，这些假设可能对使用倾斜砌体拱桥的资产工程师感兴趣。识别这些趋势对于区分额外损害和其他影响很重要。结果还用于评估关于桥梁行为的一些典型假设，这些假设可能对使用斜砌石拱桥的资产工程师感兴趣。