Recording-based identification of site liquefaction

Reconnaissance reports and pertinent research on seismic hazards show that liquefaction is one of the key sources of damage to geotechnical and structural engineering systems. Therefore, identifying site liquefaction conditions plays an important role in seismic hazard mitigation. One of the widely used approaches for detecting liquefaction is based on the time-frequency analysis of ground motion recordings, in which short-time Fourier transform is typically used. It is known that recordings at a site with liquefaction are the result of nonlinear responses of seismic waves propagating in the liquefied layers underneath the site. Moreover, Fourier transform is not effective in characterizing such dynamic features as time-dependent frequency of the recordings rooted in nonlinear responses. Therefore, the aforementioned approach may not be intrinsically effective in detecting liquefaction. An alternative to the Fourier-based approach is presented in this study,which proposes time-frequency analysis of earthquake ground motion recordings with the aid of the Hilbert-Huang transform (HHT), and offers justification for the HHT in addressing the liquefaction features shown in the recordings. The paper then defines the predominant instantaneous frequency (PIF) and introduces the PIF-related motion features to identify liquefaction conditions at a given site. Analysis of 29 recorded data sets at different site conditions shows that the proposed approach is effective in detecting site liquefaction in comparison with other methods.

作 者： Hu Yuxian Zhang Yushan Liang Jianwen Ray Ruichong Zhang   作者單位： Hu Yuxian(Institute of Geophysics, China Earthquake Administration, Beijing 100081, China)

Zhang Yushan,Liang Jianwen(Department of Civil Engineering, Tianjin University, Tianjin 300072, China)

Ray Ruichong Zhang(Division of Engineering, Colorado School of Mines, Golden, CO 80401, USA) 

刊 名： 地震工程與工程振動(dòng)（英文版）  SCI 英文刊名： EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION  年，卷(期)： 2005 4(2)  分類(lèi)號(hào)： P315  關(guān)鍵詞： site condition   liquefaction detection   Hilbert-Huang transform   predominant instantaneous frequency  

【Recording-based identification of si】相關(guān)文章：

A stochastic method for convective storm identification,tracking and nowcasting04-26

硅、鍺材料在Si(100)表面的生長(zhǎng)研究04-27

電化學(xué)方法制備Si陣列微孔的工藝研究04-26

湖南下寒武統(tǒng)黑色頁(yè)巖風(fēng)化釋Si的機(jī)制與潛力04-27

Identification of 3.5 Ga detrital zircons from Yangtze craton in south China and the implication for Archean crust evolu04-26

Mo-Si涂層C/SiC復(fù)合材料的氧化性能04-27

Identification of the bound residue composition derived from 14C-labeled chlorsulfuron in soil by using LC-MS and isotop04-26

激光熔覆Ni16Ti6Si7涂層組織與耐磨性04-27

X射線存儲(chǔ)材料Si4+摻雜BaFBr:Eu2+中電子陷阱的研究04-26

單根In摻雜的n-ZnO納米線/p+-Si異質(zhì)結(jié)的紫外電致發(fā)光04-26