Documents disponibles écrits par cet auteur

Numerical Assessment of the Influence of End Conditions on Constitutive Behavior of Geomaterials / Jeremic, Boris in Journal of engineering mechanics, Vol. 130 N°6 (Juin 2004) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 130 N°6 (Juin 2004) . - 741-745 p. Titre : Numerical Assessment of the Influence of End Conditions on Constitutive Behavior of Geomaterials Titre original : Evaluation Numérique de l'Influence des Etats de Fin sur le Comportement Constitutif de Geomaterials Type de document : texte imprimé Auteurs : Jeremic, Boris, Auteur ; Manzari, Madjid T., Editeur scientifique ; Sture, Stein ; Yang, Zhaohui, Auteur Article en page(s) : 741-745 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Elastoplasticity  Constitutive  relations  Geomaterials  Laboratory  tests  Elastoplasticité  Relations  constitutives  Géomaterials  Essais  en  laboratoire Résumé : In this paper, we investigate the behavior of elastic–plastic specimens during testing in a triaxial apparatus. In particular, an investigation of the influence of a number of imperfections on the observed behavior of a specimen is performed. To this end, we present influences of end platen friction, end platen inclinations, and the shape of specimen on what we broadly understand by “constitutive behavior.” We investigate the issues related to the constitutive as opposed to boundary value behavior or elastic–plastic specimens. We present a number of examples to illustrate the differences between different types of response, which are usually, and wrongly, just called the constitutive behavior. En cet article, nous étudions le comportement des spécimens en plastique élastiques pendant l'essai dans un appareil à trois axes. En particulier, une recherche sur l'influence d'un certain nombre d'imperfections sur le comportement observé d'un spécimen est effectuée. À cet effet, nous présentons des influences de frottement de platine d'extrémité, des inclinations de platine d'extrémité, et la forme du spécimen sur ce que nous comprenons largement par "le comportement constitutif." Nous étudions les issues liées au constitutif par opposition au comportement de valeur ou aux spécimens en plastique élastiques. Nous présentons un certain nombre d'exemples pour illustrer les différences entre les différents types de réponse, qui sont habituellement, et incorrectement, a juste appelé le comportement constitutif. DEWEY : 620.1 JOU ISSN : 0733-9399 En ligne : jeremic@ucdavis.edu [article] Numerical Assessment of the Influence of End Conditions on Constitutive Behavior of Geomaterials = Evaluation Numérique de l'Influence des Etats de Fin sur le Comportement Constitutif de Geomaterials [texte imprimé] / Jeremic, Boris, Auteur ; Manzari, Madjid T., Editeur scientifique ; Sture, Stein ; Yang, Zhaohui, Auteur . - 741-745 p. Génie Mécanique Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 130 N°6 (Juin 2004) . - 741-745 p. Mots-clés : Elastoplasticity  Constitutive  relations  Geomaterials  Laboratory  tests  Elastoplasticité  Relations  constitutives  Géomaterials  Essais  en  laboratoire Résumé : In this paper, we investigate the behavior of elastic–plastic specimens during testing in a triaxial apparatus. In particular, an investigation of the influence of a number of imperfections on the observed behavior of a specimen is performed. To this end, we present influences of end platen friction, end platen inclinations, and the shape of specimen on what we broadly understand by “constitutive behavior.” We investigate the issues related to the constitutive as opposed to boundary value behavior or elastic–plastic specimens. We present a number of examples to illustrate the differences between different types of response, which are usually, and wrongly, just called the constitutive behavior. En cet article, nous étudions le comportement des spécimens en plastique élastiques pendant l'essai dans un appareil à trois axes. En particulier, une recherche sur l'influence d'un certain nombre d'imperfections sur le comportement observé d'un spécimen est effectuée. À cet effet, nous présentons des influences de frottement de platine d'extrémité, des inclinations de platine d'extrémité, et la forme du spécimen sur ce que nous comprenons largement par "le comportement constitutif." Nous étudions les issues liées au constitutif par opposition au comportement de valeur ou aux spécimens en plastique élastiques. Nous présentons un certain nombre d'exemples pour illustrer les différences entre les différents types de réponse, qui sont habituellement, et incorrectement, a juste appelé le comportement constitutif. DEWEY : 620.1 JOU ISSN : 0733-9399 En ligne : jeremic@ucdavis.edu

Time domain simulation of soil-foundation-structure interaction in non-uniform soils / Jeremic, Boris in Earthquake engineering structural dynamics, Vol. 38 N°5 (Avril 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N°5 (Avril 2009) . - pp. 699-718 Titre : Time domain simulation of soil-foundation-structure interaction in non-uniform soils Type de document : texte imprimé Auteurs : Jeremic, Boris, Auteur ; Guanzhou Jie, Auteur ; Matthias Preisig, Auteur Article en page(s) : pp. 699-718 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Time  domain;  Earthquake  soil-foundation-structure  interaction  ;  Parallel  computing;  Finite  elements;  High-fidelity  SSI  models Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Presented here is a numerical investigation of the influence of non-uniform soil conditions on a prototype concrete bridge with three bents (four span) where soil beneath bridge bents are varied between stiff sands and soft clay. A series of high-fidelity models of the soil-foundation-structure system were developed and described in some details. Development of a series of high-fidelity models was required to properly simulate seismic wave propagation (frequency up to 10Hz) through highly nonlinear, elastic plastic soil, piles and bridge structure. Eight specific cases representing combinations of different soil conditions beneath each of the bents are simulated. It is shown that variability of soil beneath bridge bents has significant influence on bridge system (soil-foundation-structure) seismic behavior. Results also indicate that free field motions differ quite a bit from what is observed (simulated) under at the base of the bridge columns indicating that use of free field motions as input for only structural models might not be appropriate. In addition to that, it is also shown that usually assumed beneficial effect of stiff soils underneath a structure (bridge) cannot be generalized and that such stiff soils do not necessarily help seismic performance of structures. Moreover, it is shown that dynamic characteristics of all three components of a triad made up of earthquake, soil and structure play crucial role in determining the seismic performance of the infrastructure (bridge) system. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/122197605/abstract [article] Time domain simulation of soil-foundation-structure interaction in non-uniform soils [texte imprimé] / Jeremic, Boris, Auteur ; Guanzhou Jie, Auteur ; Matthias Preisig, Auteur . - pp. 699-718. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N°5 (Avril 2009) . - pp. 699-718 Mots-clés : Time  domain;  Earthquake  soil-foundation-structure  interaction  ;  Parallel  computing;  Finite  elements;  High-fidelity  SSI  models Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Presented here is a numerical investigation of the influence of non-uniform soil conditions on a prototype concrete bridge with three bents (four span) where soil beneath bridge bents are varied between stiff sands and soft clay. A series of high-fidelity models of the soil-foundation-structure system were developed and described in some details. Development of a series of high-fidelity models was required to properly simulate seismic wave propagation (frequency up to 10Hz) through highly nonlinear, elastic plastic soil, piles and bridge structure. Eight specific cases representing combinations of different soil conditions beneath each of the bents are simulated. It is shown that variability of soil beneath bridge bents has significant influence on bridge system (soil-foundation-structure) seismic behavior. Results also indicate that free field motions differ quite a bit from what is observed (simulated) under at the base of the bridge columns indicating that use of free field motions as input for only structural models might not be appropriate. In addition to that, it is also shown that usually assumed beneficial effect of stiff soils underneath a structure (bridge) cannot be generalized and that such stiff soils do not necessarily help seismic performance of structures. Moreover, it is shown that dynamic characteristics of all three components of a triad made up of earthquake, soil and structure play crucial role in determining the seismic performance of the infrastructure (bridge) system. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/122197605/abstract