Variability of Nonlinear Dynamic Shear Modulus and Damping Ratio of Soils
The dynamic shear modulus and damping ratio of soils are two important parameters in soil property and affect earthquake ground motion greatly. The laboratory experimental results at present show a significant variation because of the soil complication. Studying the uncertainty of the dynamic shear modulus and damping ratio is quite helpful for understanding the nonlinear behavior of soils. Also, the quantitative results of the variability are one of basic elements of the reliability analysis for the ground motion and structure damage.However, the related research at present mostly concentrates on the static problem and the study on dynamics parameters especially nonlinear uncertainty problem is rare.In this paper, the uncertainty of the nonlinear dynamic shear modulus and damping ratio is investigated and the quantitative results for five typical soils are presented. The original experiment data of dynamic shear modulus and damping ratio of 588 groups from 17 provinces, 42 cities in China are collected. The standard relation of dynamic shear modulus and damping ratio with the shear strain, i.e., G/Gmax-γ and λ-γ, fitted by the yperbolic model are attained. For the eight typical shear strain points in the nonlinear scope, the uncertainty of dynamic shear modulus and damping ratio is conducted. The distribution characteristics of the dynamic shear modulus and damping ratio for the eight typical shear strain points is given, separately, and the normal distribution is verified by two methods. Based on these, the reference value range of 95% probability, the maximum value, the minimum value, the mean value, the standard deviation and the coefficient variation are presented finally.
Soils Nonlinear Dynamic Shear Modulus Damping Ratio Variability Uncertainty
Hongjuan CHEN Rui SUN Xiaoming YUAN Jianyi ZHANG
Graduate,Dept.of Geotechnical Engineering,Institute of Engineering Mechanics,Harbin.China Professor,Dept.of Geotechnical Engineering,Institute of Engineering Mechanics,Harbin.China Assistant,Dept.of Geotechnical Engineering,Institute of Disaster Prevention Science and Technology,S
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）