Documents disponibles écrits par cet auteur

HDR devices for the seismic protection of frame structures: Experimental results and numerical simulations / Ragni, Laura in Earthquake engineering structural dynamics, Vol. 38 N° 10 (Août 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 10 (Août 2009) . - pp. 1199-1217 Titre : HDR devices for the seismic protection of frame structures: Experimental results and numerical simulations Type de document : texte imprimé Auteurs : Ragni, Laura, Auteur ; Luigino Dezi, Auteur ; Dall'Asta, Andrea, Auteur ; Leoni Graziano Article en page(s) : pp. 1199-1217 Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Passive  control;  High  damping  rubber;  Dissipative  bracings Résumé : As part of a national research programme an experimental campaign was carried out on a real scale mock-up consisting of a steel-concrete composite frame equipped with dissipative bracings, based on high damping rubber (HDR) devices. Free vibration tests, followed by force-controlled and displacement-controlled cyclic tests were performed. The experimental tests were aimed at studying the dynamic response of the coupled system in order to demonstrate the effectiveness of HDR devices in increasing the stiffness and dissipation capacity of the frame and investigating the ability of the constitutive HDR model proposed by the authors to predict the dynamic response of the coupled system. DEWEY : 624.1 ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] HDR devices for the seismic protection of frame structures: Experimental results and numerical simulations [texte imprimé] / Ragni, Laura, Auteur ; Luigino Dezi, Auteur ; Dall'Asta, Andrea, Auteur ; Leoni Graziano . - pp. 1199-1217. Génie civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 10 (Août 2009) . - pp. 1199-1217 Mots-clés : Passive  control;  High  damping  rubber;  Dissipative  bracings Résumé : As part of a national research programme an experimental campaign was carried out on a real scale mock-up consisting of a steel-concrete composite frame equipped with dissipative bracings, based on high damping rubber (HDR) devices. Free vibration tests, followed by force-controlled and displacement-controlled cyclic tests were performed. The experimental tests were aimed at studying the dynamic response of the coupled system in order to demonstrate the effectiveness of HDR devices in increasing the stiffness and dissipation capacity of the frame and investigating the ability of the constitutive HDR model proposed by the authors to predict the dynamic response of the coupled system. DEWEY : 624.1 ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe

A model for the 3D kinematic interaction analysis of pile groups in layered soils / Dezi Francesca in Earthquake engineering structural dynamics, Vol. 38 N° 11 (Septembre 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1281-1305 Titre : A model for the 3D kinematic interaction analysis of pile groups in layered soils Type de document : texte imprimé Auteurs : Dezi Francesca, Auteur ; Sandro Carbonari, Auteur ; Leoni Graziano, Auteur Article en page(s) : pp. 1281-1305 Langues : Anglais (eng) Mots-clés : Dynamics;  Frequency  domain;  Kinematic  interaction  ;Impedances;  Numerical  modelling;  Pile  groups;  Soil-structure  interaction Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The paper presents a numerical model for the analysis of the soil-structure kinematic interaction of single piles and pile groups embedded in layered soil deposits during seismic actions. A finite element model is considered for the pile group and the soil is assumed to be a Winkler-type medium. The pile-soil-pile interaction and the radiation problem are accounted for by means of elastodynamic Green's functions. Condensation of the problem permits a consistent and straightforward derivation of both the impedance functions and the foundation input motion, which are necessary to perform the inertial soil-structure interaction analyses. The model proposed allows calculating the internal forces induced by soil-pile and pile-to-pile interactions. Comparisons with data available in literature are made to study the convergence and validate the model. An application to a realistic pile foundation is given to demonstrate the potential of the model to catch the dynamic behaviour of the soil-foundation system and the stress resultants in each pile. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] A model for the 3D kinematic interaction analysis of pile groups in layered soils [texte imprimé] / Dezi Francesca, Auteur ; Sandro Carbonari, Auteur ; Leoni Graziano, Auteur . - pp. 1281-1305. Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1281-1305 Mots-clés : Dynamics;  Frequency  domain;  Kinematic  interaction  ;Impedances;  Numerical  modelling;  Pile  groups;  Soil-structure  interaction Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The paper presents a numerical model for the analysis of the soil-structure kinematic interaction of single piles and pile groups embedded in layered soil deposits during seismic actions. A finite element model is considered for the pile group and the soil is assumed to be a Winkler-type medium. The pile-soil-pile interaction and the radiation problem are accounted for by means of elastodynamic Green's functions. Condensation of the problem permits a consistent and straightforward derivation of both the impedance functions and the foundation input motion, which are necessary to perform the inertial soil-structure interaction analyses. The model proposed allows calculating the internal forces induced by soil-pile and pile-to-pile interactions. Comparisons with data available in literature are made to study the convergence and validate the model. An application to a realistic pile foundation is given to demonstrate the potential of the model to catch the dynamic behaviour of the soil-foundation system and the stress resultants in each pile. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe