Implementation of DSC model for dynamic analysis of soil-structure interaction problems

Persistent Link:
http://hdl.handle.net/10150/282628
Title:
Implementation of DSC model for dynamic analysis of soil-structure interaction problems
Author:
Shao, Changming, 1959-
Issue Date:
1998
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The Disturbed State Concepts (DSC) model, with simplified unloading/reloading formulation, is implemented in a nonlinear dynamic finite element program for porous media named DSC-DYN2D. It can perform static, two phase dynamic and consolidation analysis of soils and soil-structure interaction problems with the DSC model. The model and the computer procedure are verified by back predictions of laboratory tests of clay, steel-clay interfaces as well as a simulation of pile-soil interaction problem. The Disturbed State Concepts have been developed recently as a constitutive modeling approach. In the DSC, the material is assumed to transform continuously and randomly from the relatively intact state to the fully adjusted state under loading. Hence, the observed response of the material is expressed in terms of the response of relatively intact and fully adjusted states. In this dissertation, the Disturbed State Concept constitutive model is developed by using the HiSS model for the relative intact part and the critical state model for the fully adjusted part in the material. The general formulation for implementation is developed. New and simplified unloading/reloading schemes are proposed for cyclic loading. Then the DSC model with the unloading/reloading scheme are implemented in the dynamic finite element program based on the generalized Biot's theory. The procedure for determining the parameters of the DSC model and the unloading/reloading is discussed. The parameters for the steel-clay interface are found from the tests and used for the prediction of the tests. Consolidation and cyclic loading tests from the field load tests on a pile segment were numerically simulated using the finite element program DSC-DYN2D and compared with field measurements and those from the previous analysis with the HiSS model. The DSC predictions show improved agreement with the field behavior of the pile compared to those from the HiSS model. The unloading/reloading models proposed in the study are simple yet give the realistic prediction of unloading and reloading behavior of the geomaterials under cyclic loading. Overall, the computer procedure with the DSC allows improved and realistic simulation of the complex dynamic soil-structure interaction problems.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Applied Mechanics.; Engineering, Civil.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Civil Engineering and Engineering Mechanics
Degree Grantor:
University of Arizona
Advisor:
Desai, Chandra S.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleImplementation of DSC model for dynamic analysis of soil-structure interaction problemsen_US
dc.creatorShao, Changming, 1959-en_US
dc.contributor.authorShao, Changming, 1959-en_US
dc.date.issued1998en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe Disturbed State Concepts (DSC) model, with simplified unloading/reloading formulation, is implemented in a nonlinear dynamic finite element program for porous media named DSC-DYN2D. It can perform static, two phase dynamic and consolidation analysis of soils and soil-structure interaction problems with the DSC model. The model and the computer procedure are verified by back predictions of laboratory tests of clay, steel-clay interfaces as well as a simulation of pile-soil interaction problem. The Disturbed State Concepts have been developed recently as a constitutive modeling approach. In the DSC, the material is assumed to transform continuously and randomly from the relatively intact state to the fully adjusted state under loading. Hence, the observed response of the material is expressed in terms of the response of relatively intact and fully adjusted states. In this dissertation, the Disturbed State Concept constitutive model is developed by using the HiSS model for the relative intact part and the critical state model for the fully adjusted part in the material. The general formulation for implementation is developed. New and simplified unloading/reloading schemes are proposed for cyclic loading. Then the DSC model with the unloading/reloading scheme are implemented in the dynamic finite element program based on the generalized Biot's theory. The procedure for determining the parameters of the DSC model and the unloading/reloading is discussed. The parameters for the steel-clay interface are found from the tests and used for the prediction of the tests. Consolidation and cyclic loading tests from the field load tests on a pile segment were numerically simulated using the finite element program DSC-DYN2D and compared with field measurements and those from the previous analysis with the HiSS model. The DSC predictions show improved agreement with the field behavior of the pile compared to those from the HiSS model. The unloading/reloading models proposed in the study are simple yet give the realistic prediction of unloading and reloading behavior of the geomaterials under cyclic loading. Overall, the computer procedure with the DSC allows improved and realistic simulation of the complex dynamic soil-structure interaction problems.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectApplied Mechanics.en_US
dc.subjectEngineering, Civil.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineCivil Engineering and Engineering Mechanicsen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorDesai, Chandra S.en_US
dc.identifier.proquest9829367en_US
dc.identifier.bibrecord.b3855429xen_US
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