Life-cycle reliability-based design and reliability updating of reinforced concrete shield tunnels in coastal regions
Life-cycle reliability-based design and reliability updating of reinforced concrete shield tunnels in coastal regions
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DOI：
10.1080/15732479.2019.1674343
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发表时间：
2020-04
影响因子：
3.7
通讯作者：
Zhengshu He;Srivaranun Supasit;M. Akiyama;D. Frangopol
中科院分区：
文献类型：
--
作者：
Zhengshu He;Srivaranun Supasit;M. Akiyama;D. Frangopol
摘要 本文开发了一种沿海地区钢筋混凝土（RC）盾构隧道基于生命周期可靠性的设计和可靠性更新的新方法。对于新建盾构隧道，提出了一种基于可靠性的耐久性设计准则，以确定混凝土保护层和混凝土质量，以防止结构使用寿命期间结构性能恶化。针对既有盾构隧道，建立了基于序贯蒙特卡罗模拟的结构可靠性更新方法。与新建盾构隧道相比，现有盾构隧道结构性能预测的认知不确定性可以降低。在说明性示例中，研究了用于设计满足目标耐久性可靠性的 RC 节段的耐久性设计因素和最大水灰比。对于现有的钢筋混凝土盾构隧道，讨论了管片衬砌的观测变形对随时间变化的失效概率的影响。
Abstract In this paper, a novel approach for life-cycle reliability-based design and reliability updating of reinforced concrete (RC) shield tunnels in coastal regions has been developed. For new shield tunnels, a reliability-based durability design criterion to determine the concrete cover and concrete quality for preventing the deterioration of structural performance during the structural service life is proposed. For existing shield tunnels, an approach to update structural reliability is established based on Sequential Monte Carlo Simulation. Epistemic uncertainty associated with the structural performance prediction of existing shield tunnels can be reduced compared with that of new shield tunnels. In illustrative examples, durability design factors and maximum water to cement ratio for designing RC segment satisfying the target durability reliability are investigated. For existing RC shield tunnels, the effect of the observational deformation of segmental lining on the time-dependent failure probability is discussed.