Companion spectra for near-fault motions with fling-step: Resilience of structures to bidirectional seismic excitation

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-24 DOI:10.1016/j.istruc.2025.109149

Rana Roy, Arijit Acharjya, Atanu Santra

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引用次数: 0

Abstract

Based on the preferred incidence angles, companion spectra have recently been proposed and verified as suitable targets for spectral matching to estimate structural response via unidirectional analyses. These spectra were validated for near-fault motions with forward directivity. The goal of the present work is to re-evaluate their performance for fling motions, which cause permanent ground offsets and can influence structural response in distinct ways. To achieve this, companion spectra for fling motions are constructed and compared to other existing options, such as RotDpp, MaxRotD50, etc. Nonlinear dynamic analyses of structures, modeled using an established fiber formulation, show that the mean response to actual bidirectional shaking—across several real records—can be estimated with low dispersion by using fewer records independently matched with the companion spectra. This confirms that, in the near-field where directivity and fling-step effects may dominate, the companion spectra can be effectively used for a quick and accurate response assessment. This approach offers a novel method for seismic design and for evaluating the seismic resilience of infrastructure.

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带飞阶的近断层运动伴生谱：结构对双向地震激励的弹性

基于首选入射角，近年来提出并验证了伴随光谱作为光谱匹配的合适目标，通过单向分析来估计结构响应。这些谱对具有正向指向性的近断层运动进行了验证。当前工作的目标是重新评估它们在飞行运动中的性能，这会导致永久的地面偏移，并以不同的方式影响结构的响应。为了实现这一目标，构建了飞行运动的伴生光谱，并与其他现有选项（如RotDpp、MaxRotD50等）进行了比较。使用已建立的光纤公式对结构进行非线性动力学分析，结果表明，通过使用较少的记录与伴星光谱独立匹配，可以在低色散下估计实际双向振动的平均响应（跨越几个真实记录）。这证实，在指向性和飞阶效应可能占主导地位的近场中，伴星光谱可以有效地用于快速准确的响应评估。该方法为基础设施抗震设计和抗震弹性评价提供了一种新的方法。

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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.