基于地脉动H/V谱比卓越周期的场地类别划分

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Abstract The site classification method based on the predominant period of microtremor is simple, economical and quick. Many historical versions of codes and manuals including the Seismic Design Code (1964) have given corresponding classification standards. The current Seismic Design Code (2016) has revised thickness of sediments and equivalent shear wave velocity and other site classification indicators. These classification standards corresponding to the historical version of the code can no longer be applied; at the same time, the latest research at home and abroad also shows that, compared with the predominant period of the horizontal Fourier spectrum used in the early classification standard, the predominant period of the micro-tremor’s H/V spectrum ratio can more effectively express the dynamic characteristics of the site. In this paper, through the microtremor single 3-components records test and H/V spectral ratio analysis on 76 different types of sites, the corresponding relationship between the predominant period of microtremor’s H/V spectrum ratio and the site classification is studied. A set of division schemes for the predominant period of microtremor suitable for site classification in the current Seismic Design Codes are proposed. Among them, the range of the predominant period ranges of class I, II, III and IV sites are: T≤0.08s，0.08s＜T≤0.55s，0.55s＜T≤0.95s and T＞0.95s, respectively. The rationality of this scheme is demonstrated by comparing it with other site classification schemes. The results show that the scheme has been greatly improved, and the accuracy of determining the site category according to the current norms and standards has reached an average of more than 72%.
Key words: Microtremor; H/V spectral ratio; Site classification; the predominant period

Key words： Microtremor H/V spectral ratio Site classification the predominant period

Received: 08 February 2021 Published: 15 July 2022

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	SHI Lijing1
	LIU Jiaxuan1
	CHEN Shengyang1
	2

Cite this article:

SHI Lijing1,LIU Jiaxuan1,CHEN Shengyang1, et al. Site classification based on predominant period of microtremor’s H/V spectral ratio[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(13): 34-42.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I13/34

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