Novel approach for energy-spectrum-based probabilistic seismic hazard analysis in regions with limited strong earthquake data

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL
Haizhong Zhang, Rui Zhang, Yan-Gang Zhao
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Abstract

With the rapid development of energy-based seismic design, probabilistic seismic hazard analysis (PSHA) in terms of the input energy spectrum, E I, has become increasingly important. Generally, implementing E I-based PSHA requires a ground-motion prediction equation (GMPE) for E I. However, although a GMPE for E I can be constructed in regions with abundant earthquake data based on regression analyses, it is difficult to obtain in regions lacking strong ground-motion records. Therefore, this study proposes a new approach for performing E I-based PSHA in regions with limited earthquake data. Instead of using a GMPE for E I directly, a model of Fourier amplitude spectrum (FAS) is adopted, which can be determined using a small number of earthquake data with small-to-moderate magnitudes. Then, the E I of the ground motion is obtained from FAS based on the relationship between E I and FAS. Furthermore, to calculate the annual intensity exceedance rate within the proposed framework of adopting the FAS model, a highly efficient method, namely, the moment method, is applied. Several numerical examples indicate that the proposed approach not only is suitable for regions lacking strong ground-motion records but also performs very efficiently in calculating the annual intensity exceedance rate.
在强震数据有限的地区进行基于能谱的概率地震灾害分析的新方法
随着基于能量的抗震设计的快速发展,输入能量谱 E I 的概率地震危险性分析(PSHA)变得越来越重要。然而,虽然在地震数据丰富的地区可以根据回归分析构建 E I 的 GMPE,但在缺乏强烈地动记录的地区却很难获得。因此,本研究提出了一种新方法,用于在地震数据有限的地区执行基于 E I 的 PSHA。不直接使用 GMPE 来计算 E I,而是采用傅立叶振幅谱(FAS)模型。然后,根据 E I 与 FAS 之间的关系,从 FAS 得出地面运动的 E I。此外,为了在采用 FAS 模型的拟议框架内计算年烈度超限率,还采用了一种高效方法,即矩量法。几个数值实例表明,建议的方法不仅适用于缺乏强烈地动记录的地区,而且在计算年烈度超限率方面也非常有效。
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来源期刊
Earthquake Spectra
Earthquake Spectra 工程技术-工程:地质
CiteScore
8.40
自引率
12.00%
发文量
88
审稿时长
6-12 weeks
期刊介绍: Earthquake Spectra, the professional peer-reviewed journal of the Earthquake Engineering Research Institute (EERI), serves as the publication of record for the development of earthquake engineering practice, earthquake codes and regulations, earthquake public policy, and earthquake investigation reports. The journal is published quarterly in both printed and online editions in February, May, August, and November, with additional special edition issues. EERI established Earthquake Spectra with the purpose of improving the practice of earthquake hazards mitigation, preparedness, and recovery — serving the informational needs of the diverse professionals engaged in earthquake risk reduction: civil, geotechnical, mechanical, and structural engineers; geologists, seismologists, and other earth scientists; architects and city planners; public officials; social scientists; and researchers.
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