Estimation of damping ratio of soil sites using microtremor  

作　　者：郭迅 黄玉龙 袁一凡 

机构地区：[1]Institute of Engineering Mechanics,China Seismological Bureau,Harbin 150080,China Professor [2]Department of Civil and Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,China Associate Professor

出　　处：《Earthquake Engineering and Engineering Vibration》2002年第1期45-49,共5页地震工程与工程振动（英文刊）

基　　金：Research project (PolyU 5076/97E),of the Department of Civil and Structural Engineering,The Hong Kong Polytechnic University

摘　　要：It is widely known that the seismic response characteristics of a soil site depends heavily on several key dynamic properties of the soil stratum,such as predominant frequency and damping ratio.A widely used method for estimating the predominant frequency of a soil site by using microtremor records,proposed by Nakamura,is investigated to determine its effectiveness in estimating the damping ratio.The authors conducted some microtremor measurements of soil sites in Hong Kong and found that Nakamura's method might also be used to estimate the damping ratio of a soil site.Damping ratio data from several typical soil sites were obtained from both Nakamura's ratio curves using the half power point method and resonant column tests.Regression analysis indicates that there is a strong correlation between the damping ratios derived from these two different approaches.It is widely known that the seismic response characteristics of a soil site depends heavily on several key dynamic properties of the soil stratum,such as predominant frequency and damping ratio.A widely used method for estimating the predominant frequency of a soil site by using microtremor records,proposed by Nakamura,is investigated to determine its effectiveness in estimating the damping ratio.The authors conducted some microtremor measurements of soil sites in Hong Kong and found that Nakamura's method might also be used to estimate the damping ratio of a soil site.Damping ratio data from several typical soil sites were obtained from both Nakamura's ratio curves using the half power point method and resonant column tests.Regression analysis indicates that there is a strong correlation between the damping ratios derived from these two different approaches.

关 键 词：MICROTREMOR predominant frequency damping ratio 

分 类 号：P315[天文地球—地震学]