Bidirectional seismic fragility analysis of double-deck viaduct frame piers based on stripe-cloud method

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-24 DOI:10.1016/j.istruc.2024.107597

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引用次数: 0

Abstract

To evaluate the influence of bidirectional seismic action on the seismic fragility of double-deck viaduct fram pier (DVFP), this study employs a vector-valued intensity measure (IM) [PGA, Sa (T₁, 5 %)], in tandem with the stripe-cloud method. The study compares the median values of Sa and the damage probability difference index (DI) to analyze the fragility of DVFP under both unidirectional and bidirectional seismic actions. Additionally, this research investigates the sensitivity of bidirectional seismic fragility of DVFP to the incidence angles. The results indicate a notable decrease in the median Sa values for DVFP are observed under bidirectional seismic action, with decreases of 28.6 %, 24.3 %, 20.9 %, and 18.8 % corresponding to four damage states, as compared to those under unidirectional seismic action, and the corresponding parameter DIs are measured at 0.122, 0.182, 0.245, and 0.291, respectively. Notably, the most severe damage to DVFP occurs when the bidirectional seismic incidence angle is within the range of 120–135°. At this angle, the median Sa values at four damage states are 85.8 %, 86.1 %, 87.6 %, and 88.6 %, respectively, compared to the angle of 0°. Therefore, neglecting the influence of bidirectional seismic incidence angles may lead to an underestimation of the bidirectional seismic fragility of DVFP.

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基于条纹云法的双层高架桥框架墩双向地震脆性分析

为评估双向地震作用对双层高架桥框架墩（DVFP）抗震脆性的影响，本研究采用了矢量值烈度测量（IM）[PGA，Sa (T1, 5 %)]，并结合条纹云法。研究比较了 Sa 的中值和破坏概率差异指数 (DI)，以分析 DVFP 在单向和双向地震作用下的脆性。此外，该研究还探讨了 DVFP 双向地震脆性对入射角的敏感性。结果表明，在双向地震作用下，DVFP 的中值 Sa 显著下降，与单向地震作用下相比，四种破坏状态的中值 Sa 分别下降了 28.6%、24.3%、20.9% 和 18.8%，相应的参数 DI 分别为 0.122、0.182、0.245 和 0.291。值得注意的是，当双向地震入射角在 120-135° 范围内时，DVFP 受到的破坏最为严重。在该角度下，与 0° 角相比，四种破坏状态下的 Sa 中值分别为 85.8%、86.1%、87.6% 和 88.6%。因此，忽略双向地震入射角的影响可能会导致低估 DVFP 的双向地震脆性。

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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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.