[article] 
inJournal of geotechnical and geoenvironmental engineering > Vol. 137 N° 12 (Décembre 2011) . - pp. 1143-1153

Titre :	Static and dynamic axial response of drilled piers : II: Numerical simulation
Type de document :	texte imprimé
Auteurs :	Gang Wang, Auteur ; Sitar, Nicholas, Auteur
Année de publication :	2012
Article en page(s) :	pp. 1143-1153
Note générale :	Géotechnique
Langues :	Anglais (eng)
Mots-clés :	Drilled pier Dynamic loading Axial load Finite-element analysis
Résumé :	Realistic time history simulation of drilled pier/pile-soil systems under dynamic and static loading is essential for the development of effective performance-based earthquake designs of deep foundations. This paper presents the results of the numerical simulation of a series of static and dynamic tests on drilled piers performed at the University of California, Berkeley. A nonlinear soil model was implemented based on multiaxial cyclic bounding-surface plasticity within a general finite-element framework, OpenSees. The model requires a small number of parameters that can be easily obtained through conventional site investigations. The results of the simulations show that the model can reasonably simulate nonlinear response of the soil and that it does a good job of capturing the actual load deformation curves obtained from in situ dynamic and static pier load tests. Although the model is suitable for a fully nonlinear total stress analysis of soil-pile systems under multidirectional shaking, further studies are needed to enhance the model capacity by incorporating the cyclic stiffness and strength degradation caused by full stress reversals.
DEWEY :	624.1
ISSN :	1090-0241
En ligne :	http://ascelibrary.org/gto/resource/1/jggefk/v137/i12/p1143_s1?isAuthorized=no

[article] Static and dynamic axial response of drilled piers : II: Numerical simulation [texte imprimé] / Gang Wang, Auteur ; Sitar, Nicholas, Auteur . - 2012 . - pp. 1143-1153.
Géotechnique
Langues : Anglais (eng)
in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 12 (Décembre 2011) . - pp. 1143-1153

Mots-clés :	Drilled pier Dynamic loading Axial load Finite-element analysis
Résumé :	Realistic time history simulation of drilled pier/pile-soil systems under dynamic and static loading is essential for the development of effective performance-based earthquake designs of deep foundations. This paper presents the results of the numerical simulation of a series of static and dynamic tests on drilled piers performed at the University of California, Berkeley. A nonlinear soil model was implemented based on multiaxial cyclic bounding-surface plasticity within a general finite-element framework, OpenSees. The model requires a small number of parameters that can be easily obtained through conventional site investigations. The results of the simulations show that the model can reasonably simulate nonlinear response of the soil and that it does a good job of capturing the actual load deformation curves obtained from in situ dynamic and static pier load tests. Although the model is suitable for a fully nonlinear total stress analysis of soil-pile systems under multidirectional shaking, further studies are needed to enhance the model capacity by incorporating the cyclic stiffness and strength degradation caused by full stress reversals.
DEWEY :	624.1
ISSN :	1090-0241
En ligne :	http://ascelibrary.org/gto/resource/1/jggefk/v137/i12/p1143_s1?isAuthorized=no