Abstract Glass Fibre-Reinforced Polymers (GFRPs) are a popular option for pedestrian bridges over railway lines as they cause little disruption for installation or maintenance. However, as they are typically lighter and less stiff than traditional materials there is concern about their dynamic response due to human induced actions and train buffeting. Due to a lack of experimental information, further data is needed if such bridges are to be used on future lines, especially with higher speed limits. This paper presents an experimental investigation of the response of a 14.5 m GFRP truss bridge due to pedestrian loading and train induced vibrations. Vibration modes of interest were identified from impact hammer tests. The vibration responses to a range of human loading scenarios, as well as multiple train passes, were measured. The vibration levels remained low under all conditions, demonstrating that this particular type of GFRP bridge is suitable for railway crossings and that further optimisations may be available to designers while meeting vibration serviceability limits. However, consideration of the loadings suggests GFRP bridges may be more susceptible to higher pedestrian harmonics than traditional structures, and that vibrations from train buffeting are likely to be a design consideration for future bridges over high speed lines.

中文翻译：

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GFRP 铁路道口因行人和列车激励引起的振动适用性

摘要 玻璃纤维增​​强聚合物 (GFRP) 是铁路线上人行天桥的流行选择，因为它们对安装或维护的干扰很小。然而，由于它们通常比传统材料更轻且硬度更低，因此人们担心它们会因人为动作和列车抖振而产生动态响应。由于缺乏实验信息，如果此类桥梁要用于未来的线路，尤其是具有更高速度限制的线路，则需要更多数据。本文介绍了对 14.5 m GFRP 桁架桥由于行人载荷和列车引起的振动引起的响应的实验研究。感兴趣的振动模式是从冲击锤测试中确定的。测量了对一系列人体载荷情况以及多次火车通过的振动响应。在所有条件下，振动水平都保持在较低水平，这表明这种特殊类型的 GFRP 桥梁适用于铁路道口，设计人员可以在满足振动适用性限制的同时进行进一步优化。然而，对载荷的考虑表明 GFRP 桥梁可能比传统结构更容易受到更高的行人谐波的影响，并且列车抖振引起的振动可能是未来高速线路桥梁的设计考虑因素。