Seismic fragility analysis of steel reinforced concrete frame‐bent structures in CAP1400 nuclear power plant

Zhen‐Hua Xu, Jin‐Quan Zhao, Guo‐Liang Bai, Yong‐Gang Ding
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Abstract

SummaryThis paper evaluates the seismic performance of the frame‐bent structure of a conventional island main building in a nuclear power plant (NPP) using the CAP1400 NPP project of Rongcheng Shidaowan in Shandong Province as a case study. A 12‐pin 3‐span prototype structural model of a steel reinforced concrete (SRC) frame‐bent main building is established in ABAQUS, and its seismic fragility is analyzed. The results show that under the conditions of an 8‐degree frequent earthquake and an 8‐degree fortification earthquake, the transcendental probability under the four limit states of the structural seismic fragility matrix with Sa as intensity measure (IM) is higher than that with peak ground acceleration (PGA) as IM. Moreover, under an 8‐degree rare earthquake, the structure has completely exceeded the normal service performance level and has reached the service performance level of temporary use and repair. The seismic damage index of the structure demonstrates that the structure's seismic damage does not exceed the medium damage state under a small earthquake. However, under the action of a moderate earthquake, the seismic damage of the structure ranges from moderate to serious damage. When subjected to large earthquakes, the seismic damage of the structure is basically in a state of serious damage.
CAP1400 核电站钢筋混凝土框架弯曲结构的地震脆性分析
摘要 本文以山东荣成石岛湾 CAP1400 核电站工程为例,评估了核电站常规岛主楼框架弯曲结构的抗震性能。在 ABAQUS 中建立了 12 针 3 跨钢筋混凝土(SRC)框架弯曲主楼原型结构模型,并对其进行了地震脆性分析。结果表明,在 8 度频发地震和 8 度设防地震条件下,以 Sa 为烈度量(IM)的结构地震脆性矩阵四种极限状态下的超越概率高于以地面加速度峰值(PGA)为烈度量(IM)的结构地震脆性矩阵四种极限状态下的超越概率。此外,在 8 度罕见地震下,结构已完全超出正常使用性能水平,达到临时使用和维修的使用性能水平。结构的震害指数表明,在小震作用下,结构的震害没有超过中度破坏状态。但在中震作用下,结构的震害从中度破坏到严重破坏不等。在大地震作用下,结构的地震破坏基本处于严重破坏状态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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