An Improved Dynamic Hysteretic Model for Soils  

作　　者：禹海涛 王建华 袁勇 

机构地区：[1]Department of Civil Engineering,Shanghai Jiaotong University [2]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University [3]Department of Geotechnical Engineering,Tongji University

出　　处：《Journal of Shanghai Jiaotong university(Science)》2013年第6期655-659,共5页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51208296);the National Key Technology R&D Program(Nos.2011BAG07B01 and 2012BAK24B00);the National Basic Research Program(973)of China(No.2011CB013600)

摘　　要：A dynamic hysteretic constitutive model for soil dynamics, Ramberg-Osgood model, is introduced and improved in the paper. Since the model is inherently 1D and is assumed to apply to shear components only, other components of the deviatorie stress and strain and their relations in 3D case could not be fully described. Two parameters, the equivalent shear stress and the equivalent shear strain, are defined to reasonably establish relations between each of stress and strain components respectively. The constitutive equations of the initial Ramberg-Osgood model are extended to generalize the theory into multidimensional cases. Difficulties of the definition of load reversal in 3D are also addressed and solved. The improved constitutive model for soil dynamics is verified by comparisons with different soil dynamic testing data covering both sands and clays. Results show that the dynamic nonlinear hysteretie behaviors of soils can be well predicted with the improved constitutive model.A dynamic hysteretic constitutive model for soil dynamics, Ramberg-Osgood model, is introduced and improved in the paper. Since the model is inherently 1D and is assumed to apply to shear components only, other components of the deviatoric stress and strain and their relations in 3D case could not be fully described. Two parameters, the equivalent shear stress and the equivalent shear strain, are defined to reasonably establish relations between each of stress and strain components respectively. The constitutive equations of the initial Ramberg-Osgood model are extended to generalize the theory into multidimensional cases. Difculties of the definition of load reversal in 3D are also addressed and solved. The improved constitutive model for soil dynamics is verified by comparisons with diferent soil dynamic testing data covering both sands and clays. Results show that the dynamic nonlinear hysteretic behaviors of soils can be well predicted with the improved constitutive model.

关 键 词：constitutive model SOILS dynamic hysteretic NONLINEAR Ramberg-Osgood model 

分 类 号：TU452[建筑科学—岩土工程] V215.52[建筑科学—土工工程]