调查全球强运动数据库,收集自由场记录,为瑞士选择设计兼容的波形

IF 3.8 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Bulletin of Earthquake Engineering Pub Date : 2024-07-10 DOI:10.1007/s10518-024-01970-5
Francesco Panzera, Paolo Bergamo, Laurentiu Danciu, Donat Fäh
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引用次数: 0

摘要

选择地面运动的过程通常依赖于收集与所需频谱相匹配的地面运动。这一选择过程遵循特定的地震学标准,包括震级、震中距离、场地土壤类型以及需要与目标频谱相匹配的频谱周期范围等因素。在此过程中,选择算法和可用的波形数据集显然起着重要作用。在许多工程和场地响应应用中,输入的地面运动必须能够代表地球自由表面的震动,有时可能还需要特定的土壤类型。然而,实际波形数据库往往缺乏与记录台站的安装类型和土壤特性以及地震学参数相关的足够和/或一致的元数据。这种缺陷可能导致选择不合适的波形,例如位于人工结构(建筑物、桥梁、水坝)内或土壤类型与预期不同的台站记录的波形。为解决这一问题,我们在创建适用于瑞士的适当波形数据库时,首先计算了重现期为 475 年和 975 年的地震灾害分类。这种计算有助于确定与瑞士建筑规范中定义的五个地震危险区最相关的震级-距离方案。一旦确定了这些震级-距离范围,我们就会遵守有关三分量波形及其相关元数据质量控制的既定标准。我们通过对现有全球数据库中的数据进行整理和同质化,建立了一个波形数据库。为了全面起见,我们还纳入了从震源附近强运动三维物理数值模拟中获得的数据。最后,我们采用了一种结合 Eurocode 8 波形选择标准的算法。通过该算法,我们可以在瑞士的五个地震危险区内选择和缩放适合微区划分和结构分析研究的波形。由于 Eurocode 8 规定了严格的标准,因此选择与目标设计频谱相匹配的波形具有挑战性。在所需的震级-距离范围内,具有经过验证的元数据和精确场地特征的记录波形非常稀少,这也是造成这一挑战的原因。
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Investigating worldwide strong motion databases to derive a collection of free-field records to select design-compatible waveforms for Switzerland

The process of choosing ground motions typically relies on assembling a collection of ground motions that match a desired spectrum. This selection process is guided by specific seismological criteria, including factors like earthquake magnitude, distance from the epicenter, site soil type, and the range of spectral periods that need to fit with the target spectrum. The selection algorithm and the available dataset of waveforms obviously play significant roles in this process. In many engineering and site response applications, it is essential that the input ground motion is representative for the shaking at the free surface of the Earth, and at times also a specific soil type may be required. However, real waveform databases often lack sufficient and/or consistent metadata related to the installation type and soil characterization of recording stations, as well as to the earthquake seismological parameters. This deficiency can lead to the selection of inappropriate waveforms, such as those recorded by stations situated within manmade structures (buildings, bridges, dams) or on a soil type different than the intended one. To address this issue, our approach for creating an appropriate waveform database applicable to Switzerland starts with the computation of seismic hazard disaggregation for return periods of 475 and 975 years. This computation helps identifying the magnitude-distance scenarios most relevant for the five seismic hazard zones defined in the Swiss building code. Once these magnitude-distance ranges are identified, we adhere to established standards regarding the quality control of three-component waveforms and their associated metadata. We assemble a database of waveforms by collating and homogenizing data from available global databases. In the interest of comprehensiveness, we also incorporate data obtained from 3D physics-based numerical simulations of strong-motion near the seismic source. Finally, we employ an algorithm that integrates the Eurocode 8 waveform selection criteria. This algorithm allows us to select and scale waveforms suitable for microzonation and structural analysis studies within each of Switzerland’s five seismic hazard zones. Selecting waveforms compatible with the target design spectra proves to be challenging due to the stringent criteria imposed by Eurocode 8. This challenge arises from the scarcity of recorded waveforms with verified metadata and precise site characterization in the desired magnitude-distance ranges.

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来源期刊
Bulletin of Earthquake Engineering
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.
期刊最新文献
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