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Seismic failure analysis and simplified prediction methods for underground frame structures at earth fissure sites
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-24 , DOI: 10.1016/j.tust.2025.106408
Zhi Chen, Zhongming Xiong, Xuan Chen, Penggang Tian, Jianhui Niu, Zhixun Xie

Earth fissures pose a significant risk to the seismic safety of underground structures at earth fissure sites (USEFs), particularly for large-scale underground frame structures such as subway stations. To date, the failure mechanism of USEFs has only been analyzed qualitatively and requires further comprehensive investigation. Moreover, the existing failure prediction methods for USEFs are complicated, challenging to execute, time-consuming, and incur significant financial costs, necessitating the establishment of a simple and efficient failure prediction method. This study conducted a shaking table test on a USEF to investigate the dynamic response of earth fissure sites and the seismic damage characteristics of a USEF. Based on the experimental results, a tailored pushover analysis method was developed to predict the seismic failure of the USEF and was applied to reveal its underlying seismic failure mechanisms. It was found that low-frequency ground motions are significantly amplified at the earth fissure site and that the acceleration amplitudes at the hanging wall and footwall are nonuniform. This nonuniform acceleration leads to significant extrusion and separation between the hanging wall and footwall. The extrusion causes the soil to rise, exerting additional axial pressure and bending moments on the lateral resistance members. These additional forces lead to uneven internal force distributions within the USEF, highlighting that structurally weak members are prone to failure and accelerating structural damage. The bottom column at the hanging wall is the critical seismic member of the USEF, which requires focused reinforcement and monitoring to increase resilience. The tailored pushover analysis method accurately represents the deformation characteristics at earth fissure sites. The method captures distinct structural destruction patterns, enhancing its utility in seismic failure prediction for USEFs.

中文翻译:


裂隙现场地下框架结构的地震破坏分析及简化预测方法



地裂缝对地裂缝遗址 (USEF) 地下结构的地震安全构成重大风险,特别是对于地铁站等大型地下框架结构。迄今为止,USEF 的失效机制仅进行了定性分析,需要进一步的全面调查。此外,现有的 USEF 失效预测方法复杂、执行难度大、耗时长且产生大量财务成本,需要建立一种简单高效的失效预测方法。本研究对 USEF 进行了振动台测试,以研究地球裂缝遗址的动力响应和 USEF 的地震损伤特性。基于实验结果,开发了一种量身定制的 Pushover 分析方法来预测 USEF 的地震破坏,并应用于揭示其潜在的地震破坏机制。研究发现,低频地震动在地裂缝部位被显著放大,上盘和下盘的加速度幅度不均匀。这种不均匀的加速度导致上盘和下盘之间发生明显的挤压和分离。挤压导致土壤上升,从而对侧向阻力构件施加额外的轴向压力和弯矩。这些额外的力导致 USEF 内的内力分布不均匀,突出表明结构较弱的构件容易失效并加速结构损坏。上墙上的底柱是 USEF 的关键地震构件,需要集中加固和监测以提高弹性。 量身定制的 Pushover 分析方法准确地代表了地裂缝部位的变形特征。该方法捕获了不同的结构破坏模式,增强了其在 USEF 地震破坏预测中的实用性。
更新日期:2025-01-24
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