Abstract Fragility analysis is a well-known tool to evaluate the impact of different retrofit measures on damage probability of structures. In this study, the performances of a conventional multi-span continuous (MSC) concrete girder bridge reinforced with different seismic control devices were investigated. The original bridge is supported by both elastomeric bearings and exterior shear keys. For other retrofitting solutions, lead rubber bearings (LRB), friction pendulum systems (FPS), and buckling-restrained braces (BRB) were considered and compared to the original structure of the bridge in terms of seismic performances and economical costs. To analyze the seismic performances, the fragility curves based on the probabilistic seismic demand model were extracted under various near-field and far-field ground motions. Additionally, cost-benefit analyses were performed to determine the benefit of using each of the devices economically. The results indicated that both LRB and FPS significantly reduced the damage probability of substructure, while FPS provided the bridge with high vulnerability in abutment seat at slight and moderate levels of damage. Also, the installation of BRB seismically was an efficient solution and decreased the damage probability of the bridge system. Based on the results of fragility and cost-benefit analysis, LRB was found to be a beneficial implement for the studied bridge.

中文翻译：

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带有改造工具的传统桥梁的抗震脆弱性和成本效益分析

摘要 易损性分析是评估不同改造措施对结构损伤概率影响的著名工具。在这项研究中，研究了用不同抗震装置加固的传统多跨连续 (MSC) 混凝土梁桥的性能。原来的琴桥由弹性轴承和外部剪切键支撑。对于其他改造解决方案，考虑了铅橡胶支座 (LRB)、摩擦摆系统 (FPS) 和屈曲约束支撑 (BRB)，并在抗震性能和经济成本方面与桥梁的原始结构进行了比较。为了分析地震性能，基于概率地震需求模型提取了各种近场和远场地震动下的脆性曲线。此外，进行了成本效益分析，以确定经济地使用每种设备的好处。结果表明，LRB 和 FPS 都显着降低了下部结构的损坏概率，而 FPS 为桥梁在轻度和中度损坏的桥台座提供了高脆弱性。此外，抗震安装 BRB 是一种有效的解决方案，并降低了桥梁系统的损坏概率。基于易损性和成本效益分析的结果，LRB 被认为是研究桥梁的有益工具。而 FPS 则在轻度和中度损坏的情况下为桥台提供了高度脆弱的桥梁。此外，抗震安装 BRB 是一种有效的解决方案，并降低了桥梁系统的损坏概率。基于易损性和成本效益分析的结果，发现LRB 是研究桥梁的有益工具。而 FPS 则在轻度和中度损坏的情况下为桥台提供了高度脆弱的桥梁。此外，抗震安装 BRB 是一种有效的解决方案，降低了桥梁系统的损坏概率。基于易损性和成本效益分析的结果，发现LRB 是研究桥梁的有益工具。