This study focuses on structural systems, which are particularly attractive for bridge design. Specifically, it investigates the seismic performance of single-column bridges, which are either conventionally designed, with the column monolithically connected with the ground (i.e. fixed-base), or designed with the column-footing system able to uplift and exhibit planar rocking motion during an earthquake. Although various researchers have studied the examined structures in terms of their seismic fragility, their seismic losses, post-earthquake functionality and resilience have received less attention. This paper redirects our attention to the main benefits of rocking design over the conventional (fixed-base) design in the aftermath of severe seismic hazard scenarios. The analysis reveals the considerably mitigated (short-term and long-term) seismic losses of the rocking structure compared to the pertinent losses of the fixed-base structure. In addition, the results show the remarkable functionality and resilience of the rocking structure after all the examined seismic hazard scenarios. Importantly, this work unveils that the post-earthquake financial benefits of the rocking structure can be further increased when the structure is carefully designed. In particular, even a small modification of its slenderness can lead to a substantial enhancement of its post-earthquake performance. The above findings illustrate the potential of the rocking structural system as an alternative seismic design paradigm for bridges and serve as the basis for a more rational and holistic seismic assessment framework of single-column rocking bridges.

中文翻译：

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单柱摇摆桥的地震损失和回弹力评估

这项研究的重点是结构系统，这对于桥梁设计特别有吸引力。具体来说，它研究的是单柱桥的抗震性能，这些桥既可以按常规设计，也可以将柱与地面整体连接（即固定基座），也可以采用能够提升并表现出平面摇摆运动的柱基础系统进行设计。在地震中。尽管许多研究人员根据地震易损性研究了这些结构，但其地震损失，地震后功能和回弹力却受到较少的关注。本文将我们的注意力转移到在严重地震危险场景之后，与常规（固定基础）设计相比，摇摆设计的主要优势。分析显示，与固定基础结构的相关损失相比，摇摆结构的地震损失得到了显着缓解（短期和长期）。此外，结果表明，在所有检查过的地震危险情况下，摇摆结构均具有出色的功能性和回弹力。重要的是，这项工作表明，精心设计摇摆结构的震后财务收益可以进一步增加。特别是，即使对其细长度进行很小的改动，也可以大大提高其震后性能。