Rotational spectra consistent with horizontal seismic hazard

IF 3.8 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Bulletin of Earthquake Engineering Pub Date : 2024-10-28 DOI:10.1007/s10518-024-02043-3

Ravi Kanth Sriwastav, Dhiman Basu

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引用次数: 0

Abstract

The distinct contribution of rotational ground motion to the failure of structures has been observed in the past. A direct recommendation on considering rotational hazards in seismic design is not presently available. In this work, the construction of rocking and torsional spectra [collectively called rotational spectra (Rot)] for scenario- and intensity- based seismic performance assessment is proposed based on scaling of the associated horizontal spectra (H) through respective Rot/H spectra. Rot/H spectral shape is determined given the earthquake magnitude, epicentral distance, and average shear wave velocity. The procedure is based on the ratio of median rotational to median horizontal-spectral ordinates, which has been demonstrated to be a good representation of the median Rot/H spectral ratio. The median level recommendations are also demonstrated to apply to design level (of a particular facility located in a specific site, which is also governed by a scenario) under certain assumptions. Determination of Rot/H spectrum contingent on a scenario involves two steps: construction of normalized Rot/H spectra (denoted by alpha) with unity at zero period scaled by the ratio of median Rotational- to median Horizontal- PGA (denoted by beta). An estimate of alpha and beta for different soil types is also proposed for intensity-based assessment.

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旋转谱与水平地震危险性一致

旋转地面运动对结构破坏的明显贡献在过去已经被观察到。目前还没有关于在抗震设计中考虑旋转危险的直接建议。在这项工作中，基于相关水平谱(H)通过各自的Rot/H谱的缩放，提出了基于场景和强度的地震性能评估的摇晃和扭转谱[统称为旋转谱（Rot）]的构建。根据地震震级、震中距离和平均横波速度确定Rot/H谱形状。该程序基于中位数旋转坐标与中位数水平光谱坐标的比值，这已被证明是中位数Rot/H光谱比值的良好表示。在某些假设下，也证明了中位水平建议适用于设计水平（位于特定地点的特定设施，也受场景控制）。根据场景确定Rot/H光谱包括两个步骤：构建归一化的Rot/H光谱（用alpha表示），在零周期用中位数旋转PGA与中位数水平PGA（用beta表示）的比例缩放。对不同土壤类型的α和β的估计也提出了基于强度的评估。

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

Bulletin of Earthquake Engineering 工程技术-地球科学综合

CiteScore

8.90

自引率

19.60%

发文量

263

审稿时长

7.5 months

期刊介绍： Bulletin of Earthquake Engineering presents original, peer-reviewed papers on research related to the broad spectrum of earthquake engineering. The journal offers a forum for presentation and discussion of such matters as European damaging earthquakes, new developments in earthquake regulations, and national policies applied after major seismic events, including strengthening of existing buildings. Coverage includes seismic hazard studies and methods for mitigation of risk; earthquake source mechanism and strong motion characterization and their use for engineering applications; geological and geotechnical site conditions under earthquake excitations; cyclic behavior of soils; analysis and design of earth structures and foundations under seismic conditions; zonation and microzonation methodologies; earthquake scenarios and vulnerability assessments; earthquake codes and improvements, and much more. This is the Official Publication of the European Association for Earthquake Engineering.