地铁地下车站结构抗震韧性评价方法及DAIKAI站案例研究

Seismic resilience assessment method of underground subway station and verification study on DAIKAI station

  • 摘要: 地铁地下车站作为城市轨道交通的重要节点,其震后恢复能力将很大程度上影响整个城市轨道交通的抗震韧性。因地下结构完全埋于土中,其震后修复难度大、时间长、成本高,基于地上结构的抗震韧性评价方法不能直接应用于地下结构。为此,本文以日本DAIKAI地下车站实际震害为例,采用课题组提出的地下车站结构易损性分析方法,通过引入地下结构不同损伤状态下的经济损失修正系数λL, i及修复时间修正系数λt,完善了地铁地下车站结构的抗震韧性评价方法,探讨了不同恢复函数及地震动强度对地下车站结构韧性损失的影响,并与DAIKAI站实际震害及震后修复资料进行对比。结果表明:本文考虑地下结构经济损失及修复特征的地铁地下车站结构抗震韧性评估结果能够准确评估其韧性损失,在震后采用快速恢复(指数型恢复函数)能够最大程度减小车站结构的韧性损失。本文定义了基于车站功能的可恢复功能地震动强度限值来表示确保车站结构功能不完全丧失的最大地震动强度,预测DAIKAI地下车站的可恢复功能地震动强度限值为0.625 g。

     

    Abstract: The subway station is an important joint of the whole city subway system, its procedure of recovery from earthquake would extremely impact the resilience performance of the whole city subway system. However, the post-earthquake repair of underground subway station is difficult, time-consuming, and costly commonly, the present seismic resilience assessment method based on superstructure could not apply to the underground structures. Thus, this paper based on the former fragility research of DAIKAI station, introducing the correction factor λL, i of economic loss under different seismic performance levels and the correction factor λt of recovery time to consider the particularity of post-earthquake repair of underground station, which improved the resilience assessment method of underground station structure, discussing the influence of recovery function and ground motion intensity on the resilience of underground station structure, comparing to the actual data of post-earthquake damage and repair of DAIKAI station. The results indicated that the improved resilience assessment method considering the particularity of economic loss and repair time can assess the resilience loss of the underground station structure accurately. The resilience loss of the station with rapid recovery strategy (exponential recovery) is the least. Besides, this paper defined the limit recoverable ground motion intensity to ensure the function of the station would not totally loss, the results predicted the limit recoverable ground motion intensity of DAIKAI station is 0.625g.

     

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