A long-span concrete-filled steel tubular (CFST) arch bridge suffers severe vehicle-induced dynamic responses during its service life. However, few quantitative studies have been reported on the typical diseases suffered by such bridges and their effects on vehicle-induced dynamic response. Thus, a series of field tests and theoretical analyses were conducted to study the effects of typical diseases on the vehicle-induced dynamic response of a typical CFST arch bridge. The results show that a support void results in a height difference between both sides of the expansion joint, thus increasing the effect of vehicle impact on the main girder and suspenders. The impact factor of the displacement response of the main girder exceeds the design value. The variation of the suspender force is significant, and the diseases are found to have a greater effect on a shorter suspender. The theoretical analysis results also show that the support void causes an obvious longitudinal displacement of the main girder that is almost as large as the vertical displacement. The support void can also cause significant changes in the vehicle-induced acceleration response, particularly when the supports and steel box girder continue to collide with each other under the vehicle load.

中文翻译：

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大跨度钢管混凝土拱桥的典型病害及其对车辆动力响应的影响

大跨度钢管混凝土（CFST）拱桥在使用寿命期间会遭受严重的车辆动态响应。然而，关于这种桥遭受的典型疾病及其对车辆诱导的动态反应的影响的定量研究报道很少。因此，进行了一系列的现场测试和理论分析，以研究典型疾病对典型CFST拱桥的车辆诱导动力响应的影响。结果表明，支撑空隙会导致伸缩缝两侧的高度差，从而增加车辆对主梁和悬索的冲击效果。主梁位移响应的影响因素超过了设计值。悬挂力的变化很大，并且发现该疾病对较短的悬挂器具有更大的作用。理论分析结果还表明，支撑空隙会导致主梁的明显纵向位移，几乎与垂直位移一样大。支撑空隙还会导致车辆引起的加速度响应发生重大变化，特别是当支撑件和钢箱梁在车辆负载下继续相互碰撞时。