Three-dimensional behavior of a spherical self-centering precast prestressed pile isolator / Rosita Jünemann in Earthquake engineering structural dynamics, Vol. 38 N°5 (Avril 2009)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 38 N°5 (Avril 2009) . - pp. 541-564 Titre : Three-dimensional behavior of a spherical self-centering precast prestressed pile isolator Type de document : texte imprimé Auteurs : Rosita Jünemann, Auteur ; Llera (de la), Juan C., Auteur ; Jaime Besa, Auteur ; José L. Almazán Article en page(s) : pp. 541-564 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Kinematic isolators  Prestressed rod  Seismic isolation  Structural element  Self-centering  Rolling constraints Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A 3D analytical formulation of a precast prestressed pile (PPP) seismic isolator with top and bottom spherical rolling kinematic constraints is proposed. The PPP isolator was initially conceived as a low-cost seismic isolation (and foundation) system for housing units of low-income people. Since these structures are usually located at sites with poor soil conditions, the PPP isolator also works as a foundation pile by connecting the superstructure with more competent soil layers. The non-holonomic nature of the rolling constraint is dealt with by a structural formulation. The proposed 3D formulation is validated by numerical results obtained from a previously proposed formulation for the 2D problem, and a contact finite element model in ANSYS (www.ansys.com). Other issues associated with the dynamic response of isolated structures with the PPP are also examined, such as expected response reductions, variation in the axial force of the central prestressed cable, and torsional response amplifications. Finally, guidelines to estimate the actual 3D response using 2D analysis results are investigated. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/122210039/abstract [article] Three-dimensional behavior of a spherical self-centering precast prestressed pile isolator [texte imprimé] / Rosita Jünemann, Auteur ; Llera (de la), Juan C., Auteur ; Jaime Besa, Auteur ; José L. Almazán . - pp. 541-564. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N°5 (Avril 2009) . - pp. 541-564 Mots-clés : Kinematic isolators  Prestressed rod  Seismic isolation  Structural element  Self-centering  Rolling constraints Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A 3D analytical formulation of a precast prestressed pile (PPP) seismic isolator with top and bottom spherical rolling kinematic constraints is proposed. The PPP isolator was initially conceived as a low-cost seismic isolation (and foundation) system for housing units of low-income people. Since these structures are usually located at sites with poor soil conditions, the PPP isolator also works as a foundation pile by connecting the superstructure with more competent soil layers. The non-holonomic nature of the rolling constraint is dealt with by a structural formulation. The proposed 3D formulation is validated by numerical results obtained from a previously proposed formulation for the 2D problem, and a contact finite element model in ANSYS (www.ansys.com). Other issues associated with the dynamic response of isolated structures with the PPP are also examined, such as expected response reductions, variation in the axial force of the central prestressed cable, and torsional response amplifications. Finally, guidelines to estimate the actual 3D response using 2D analysis results are investigated. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/122210039/abstract

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