Electric power system is one of essential lifeline systems for an urban community. An actual power plant building with typical coal‐fired power generation process is selected to be studied in this paper. The detrimental impacts on the seismic performance of the structural system induced by heavy coal bunkers and irregular bracing configurations are expected to be mitigated by using retrofit strategies. A total of three retrofit design schemes that employ the isolation and supplemental damping techniques are developed. The original design scheme of the actual thermal power plant building that adopts steel special concentrically braced frame as lateral‐force resisting system is used as benchmark for comparison purposes. Nonlinear response‐history analyses are performed, and the obtained seismic responses are compared. To better quantify the benefit of the considered retrofit strategies, seismic risk in terms of probabilities of exceeding designated damage states as well as the downtime are analyzed. For the studied thermal power plant building, the results show that the added damping system is more effective in seismic risk reduction than the isolation for heavy coal bunkers. Compared to the original structural system design, the use of supplemental damping system cut the downtime of the thermal power plant building at most 42%.

中文翻译：

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不规则火力发电厂建筑物的抗震改造设计和风险评估

电力系统是城市社区必不可少的生命线系统之一。本文选择具有典型燃煤发电过程的实际发电厂进行研究。重型煤仓和不规则支撑结构对结构系统抗震性能的不利影响预计将通过使用改造策略来减轻。总共开发了三种采用隔离和辅助阻尼技术的改造设计方案。为了进行比较，以采用钢制特殊同心支撑框架作为侧向抗力系统的实际火电厂建筑物的原始设计方案为基准。进行了非线性响应历史分析，并对获得的地震响应进行了比较。为了更好地量化考虑的改造策略的收益，分析了超出指定破坏状态的概率以及停机时间带来的地震风险。对于所研究的火力发电厂建筑物，结果表明，相比于重型煤仓隔离，增加的阻尼系统在降低地震风险方面更为有效。与原始结构系统设计相比，使用辅助阻尼系统最多可将热电厂建筑物的停机时间减少42％。