Implications of input ground-motion selection techniques on site response analyses for different tectonic settings

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL
Ishika N Chowdhury, Ashly Cabas, James Kaklamanos, Albert Kottke, Nick Gregor
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引用次数: 0

Abstract

This study investigates how current practices of input ground-motion selection influence site response analysis results and their variability, when considering different tectonic settings. Study sites in Seattle and Boston are chosen to represent tectonic settings with contributions to the seismic hazard from shallow crustal and subduction events, as well as stable continental regions, respectively. Selected input ground-motion suites for one-dimensional site response analysis represent variations in the target spectrum definition, spectral period of interest, seismic source, and ground-motion database. When directly incorporating different types of seismic sources (e.g. shallow crustal versus subduction) into target spectrum definitions and selecting ground motions from the corresponding databases (i.e. consistent with such seismic sources), differences on the estimated site response and its variability are observed. These effects are captured by spectral amplification factors and nonspectral intensity measures (significant duration and Arias intensity) and become particularly apparent for subduction zones. The variability in spectral amplification factors stemming from ground-motion selection techniques is found to be also a function of the characteristics of the site, becoming higher near the fundamental period of the site. Estimated responses at stiffer sites are more significantly influenced by ground-motion selection techniques, whereas the onset of nonlinear soil behavior at softer sites can reduce such variability.
输入地动选择技术对不同构造背景下场地响应分析的影响
本研究调查了在考虑不同构造环境时,输入地动选择的现行做法如何影响场地响应分析结果及其可变性。研究地点选在西雅图和波士顿,分别代表浅地壳和俯冲事件以及稳定大陆地区对地震灾害有影响的构造环境。用于一维场地响应分析的选定输入地动套件代表了目标频谱定义、感兴趣的频谱周期、震源和地动数据库的变化。当直接将不同类型的震源(如浅地壳与俯冲)纳入目标频谱定义,并从相应的数据库(即与这些震源一致的)中选择地动时,会观察到估计的场地响应及其变化的差异。这些影响通过频谱放大系数和非频谱烈度测量(显著持续时间和阿里亚斯烈度)来捕捉,在俯冲带尤为明显。研究发现,地动选择技术产生的频谱放大系数的变异也是场地特征的一个函数,在场地基本周期附近变得更高。较硬场地的估计响应受地动选择技术的影响更大,而较软场地的非线性土壤行为的开始可减少这种变异性。
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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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