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Bidirectional seismic behavior of controlled rocking four-legged bridge steel truss piers / Michael Pollino in Journal of structural engineering, Vol. 136 N° 12 (Décembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1512-1522 Titre : Bidirectional seismic behavior of controlled rocking four-legged bridge steel truss piers Type de document : texte imprimé Auteurs : Michael Pollino, Auteur ; Michel Bruneau, Auteur Année de publication : 2011 Article en page(s) : pp. 1512-1522 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Controlled  rocking  Seismic  Behavior  Design  Bridge  piers  Rocking  Passive  energy  dissipation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The behavior and design of four-legged controlled rocking bridge steel truss piers to three components of seismic excitation are presented in this paper. The controlled rocking approach for seismic protection allows a pier to uplift from its base, limiting the force demands placed on the bridge pier and deck, and can allow the structure to remain elastic during an earthquake, preventing damage toward the goal of keeping the bridge operational immediately following the earthquake. Passive energy dissipation devices [steel yielding devices (SYDs) or fluid viscous dampers (VDs)] are used at the uplifting location to control pier response. The bidirectional kinematic and hysteretic cyclic behavior of controlled rocking piers with SYDs is presented and verified with nonlinear static pushover analysis. This fundamental behavior is used to develop design equations to predict peak pier displacements, uplifting displacements, and forces (frame shear and leg axial force). Dynamic response history analyses are performed, compared with the design equations, and shown to provide reasonably accurate results for design. The use of fluid VDs in the controlled rocking system is then discussed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i12/p1512_s1?isAuthorized=no [article] Bidirectional seismic behavior of controlled rocking four-legged bridge steel truss piers [texte imprimé] / Michael Pollino, Auteur ; Michel Bruneau, Auteur . - 2011 . - pp. 1512-1522. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1512-1522 Mots-clés : Controlled  rocking  Seismic  Behavior  Design  Bridge  piers  Rocking  Passive  energy  dissipation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The behavior and design of four-legged controlled rocking bridge steel truss piers to three components of seismic excitation are presented in this paper. The controlled rocking approach for seismic protection allows a pier to uplift from its base, limiting the force demands placed on the bridge pier and deck, and can allow the structure to remain elastic during an earthquake, preventing damage toward the goal of keeping the bridge operational immediately following the earthquake. Passive energy dissipation devices [steel yielding devices (SYDs) or fluid viscous dampers (VDs)] are used at the uplifting location to control pier response. The bidirectional kinematic and hysteretic cyclic behavior of controlled rocking piers with SYDs is presented and verified with nonlinear static pushover analysis. This fundamental behavior is used to develop design equations to predict peak pier displacements, uplifting displacements, and forces (frame shear and leg axial force). Dynamic response history analyses are performed, compared with the design equations, and shown to provide reasonably accurate results for design. The use of fluid VDs in the controlled rocking system is then discussed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i12/p1512_s1?isAuthorized=no

Seismic testing of a bridge steel truss pier designed for controlled rocking / Michael Pollino in Journal of structural engineering, Vol. 136 N° 12 (Décembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1523-1532 Titre : Seismic testing of a bridge steel truss pier designed for controlled rocking Type de document : texte imprimé Auteurs : Michael Pollino, Auteur ; Michel Bruneau, Auteur Année de publication : 2011 Article en page(s) : pp. 1523-1532 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Experimental  testing  Bridge  piers  Seismic  Passive  energy  dissipation  Controlled  rocking Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Shake table testing of a 1/5 scale model of a slender bridge steel truss pier that uses a controlled rocking approach as a means of seismic protection was conducted. The controlled rocking approach allows the pier to uplift from its base while passive energy dissipation devices (steel yielding devices or fluid viscous dampers) are implemented across the uplifting location to control the response. The fundamental static and dynamic bidirectional behavior of controlled rocking four-legged bridge piers has been developed and evaluated in past research. This paper discusses the experimental specimen’s design, setup, and results of the testing. The testing program included the use of three sets of steel yielding devices and a set of fluid viscous dampers as the passive control devices. The specimens were subjected to ground motion records with increasing amplitude. The results of the testing were used to verify and further investigate the behavior of piers designed by the controlled rocking approach. Much of the fundamental behavior (self-centering, hysteretic behavior, and higher mode participation) are evident in the experimental results. Comparisons between the experimental results with design predictions and nonlinear time history analysis are made that show reasonable prediction of response. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i12/p1523_s1?isAuthorized=no [article] Seismic testing of a bridge steel truss pier designed for controlled rocking [texte imprimé] / Michael Pollino, Auteur ; Michel Bruneau, Auteur . - 2011 . - pp. 1523-1532. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1523-1532 Mots-clés : Experimental  testing  Bridge  piers  Seismic  Passive  energy  dissipation  Controlled  rocking Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Shake table testing of a 1/5 scale model of a slender bridge steel truss pier that uses a controlled rocking approach as a means of seismic protection was conducted. The controlled rocking approach allows the pier to uplift from its base while passive energy dissipation devices (steel yielding devices or fluid viscous dampers) are implemented across the uplifting location to control the response. The fundamental static and dynamic bidirectional behavior of controlled rocking four-legged bridge piers has been developed and evaluated in past research. This paper discusses the experimental specimen’s design, setup, and results of the testing. The testing program included the use of three sets of steel yielding devices and a set of fluid viscous dampers as the passive control devices. The specimens were subjected to ground motion records with increasing amplitude. The results of the testing were used to verify and further investigate the behavior of piers designed by the controlled rocking approach. Much of the fundamental behavior (self-centering, hysteretic behavior, and higher mode participation) are evident in the experimental results. Comparisons between the experimental results with design predictions and nonlinear time history analysis are made that show reasonable prediction of response. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i12/p1523_s1?isAuthorized=no