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Quasi-static and pseudo-dynamic testing of unbonded post-tensioned rocking bridge piers with external replaceable dissipaters / Dion Marriott in Earthquake engineering structural dynamics, Vol. 38 N°3 (Mars 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N°3 (Mars 2009) . - pp. 331-354 Titre : Quasi-static and pseudo-dynamic testing of unbonded post-tensioned rocking bridge piers with external replaceable dissipaters Type de document : texte imprimé Auteurs : Dion Marriott, Auteur ; Pampanin, Stefano, Auteur ; Alessandro Palermo, Auteur Article en page(s) : pp. 331-354 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Bridge  piers;  Unbonded  post-tensioning;  Cyclic  tests;  Pseudo-dynamic;  External  replaceable  dissipaters;  Energy  dissipation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : It has been well documented that following a major earthquake a substantial percentage of economic loss results from downtime of essential lifelines in and out of major urban centres. This has thus led to an improvement of both performance-based seismic design philosophies and to the development of cost-effective seismic structural systems capable of guaranteeing a high level of protection, low structural damage and reduced downtime after a design-level seismic event. An example of such technology is the development of unbonded post-tensioned techniques in combination with rocking-dissipating connections. In this contribution, further advances in the development of high-performance seismic-resistant bridge piers are achieved through the experimental validation of unbonded post-tensioned bridge piers with external, fully replaceable, mild steel hysteretic dissipaters. The experimental response of three 1 : 3 scale unbonded, post-tensioned cantilever bridge piers, subjected to quasi-static and pseudo-dynamic loading protocols, are presented and compared with an equivalently reinforced monolithic benchmark. Minimal physical damage is observed for the post-tensioned systems, which exhibit very stable energy dissipation and re-centring properties. Furthermore, the external dissipaters can be easily replaced if severely damaged under a major (higher than expected) earthquake event. Thus, negligible residual deformations, limited repair costs and downtime can be achieved for critical lifeline components. Satisfactory analytical-experimental comparisons are also presented as a further confirmation of the reliability of the design procedure and of the modelling techniques. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121502265/abstract [article] Quasi-static and pseudo-dynamic testing of unbonded post-tensioned rocking bridge piers with external replaceable dissipaters [texte imprimé] / Dion Marriott, Auteur ; Pampanin, Stefano, Auteur ; Alessandro Palermo, Auteur . - pp. 331-354. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N°3 (Mars 2009) . - pp. 331-354 Mots-clés : Bridge  piers;  Unbonded  post-tensioning;  Cyclic  tests;  Pseudo-dynamic;  External  replaceable  dissipaters;  Energy  dissipation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : It has been well documented that following a major earthquake a substantial percentage of economic loss results from downtime of essential lifelines in and out of major urban centres. This has thus led to an improvement of both performance-based seismic design philosophies and to the development of cost-effective seismic structural systems capable of guaranteeing a high level of protection, low structural damage and reduced downtime after a design-level seismic event. An example of such technology is the development of unbonded post-tensioned techniques in combination with rocking-dissipating connections. In this contribution, further advances in the development of high-performance seismic-resistant bridge piers are achieved through the experimental validation of unbonded post-tensioned bridge piers with external, fully replaceable, mild steel hysteretic dissipaters. The experimental response of three 1 : 3 scale unbonded, post-tensioned cantilever bridge piers, subjected to quasi-static and pseudo-dynamic loading protocols, are presented and compared with an equivalently reinforced monolithic benchmark. Minimal physical damage is observed for the post-tensioned systems, which exhibit very stable energy dissipation and re-centring properties. Furthermore, the external dissipaters can be easily replaced if severely damaged under a major (higher than expected) earthquake event. Thus, negligible residual deformations, limited repair costs and downtime can be achieved for critical lifeline components. Satisfactory analytical-experimental comparisons are also presented as a further confirmation of the reliability of the design procedure and of the modelling techniques. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121502265/abstract