ABSTRACT The paper addresses the seismic vulnerability assessment of a multi-span footbridge, prone to span unseating due to shorter seat lengths. The structure is representative of a series of pedestrian crossings located in the Southern part of Portugal, a region with a relevant seismicity. A probabilistic approach allows considering the variability of the seismic action and uncertainties in the definition of the material properties and/or structural behavior. Based on incremental dynamic analyses and corresponding fragility curves, it is shown that, for code compliance design acceleration, there is a significant probability that the structure will only suffer minor damage.

中文翻译：

---

钢筋混凝土人行横道地震易损性评估

摘要 本文讨论了多跨人行桥的地震易损性评估，由于较短的座位长度，容易发生跨度脱座。该结构代表了位于葡萄牙南部的一系列人行横道，该地区具有相关的地震活动。概率方法允许在材料特性和/或结构行为的定义中考虑地震作用的可变性和不确定性。基于增量动力分析和相应的易损性曲线，表明对于符合规范的设计加速，结构很可能只​​会遭受轻微损坏。