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Performance of advanced materials during earthquake loading tests of a bridge system / Carlos A. Cruz Noguez in Journal of structural engineering, Vol. 139 N° 1 (Janvier 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 144–154 Titre : Performance of advanced materials during earthquake loading tests of a bridge system Type de document : texte imprimé Auteurs : Carlos A. Cruz Noguez, Auteur ; M. Saiid Saiidi, Auteur Année de publication : 2013 Article en page(s) : pp. 144–154 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Bridge  Earthquake  simulation  Elastomeric  pads  Engineered  cementitious  composite  Posttensioned  columns  Shake-table  test  Shape  memory  alloy Résumé : Three unconventional details for the plastic hinge regions of bridge columns subjected to seismic loads were developed, designed, and implemented in a large-scale, four-span RC bridge. Superelastic shape memory alloys (SMAs), engineered cementitious composites (ECCs), posttensioned columns, and elastomeric bearings were used in three different piers to improve the seismic performance of the bridge in terms of minimizing damage and reducing residual displacements. The bridge model was subjected to a series of biaxial earthquake excitations with increasing amplitudes. The experimental results showed that, besides being effective in reducing permanent displacement of the bridge, the high-performance materials and details substantially reduced the damage at plastic hinge regions and modified significantly other response parameters of the bents compared with conventional RC construction. Higher ductility was observed in the pier with the SMA/ECC combination, and larger load capacity was exhibited by the pier with elastomeric pads. While rotations at the plastic hinges with high-performance materials were significantly larger than those measured at plastic hinges made of conventional RC, the measured residual strains in the longitudinal reinforcement in the plastic hinges with innovative details were smaller than those observed in RC plastic hinges. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000611 [article] Performance of advanced materials during earthquake loading tests of a bridge system [texte imprimé] / Carlos A. Cruz Noguez, Auteur ; M. Saiid Saiidi, Auteur . - 2013 . - pp. 144–154. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 144–154 Mots-clés : Bridge  Earthquake  simulation  Elastomeric  pads  Engineered  cementitious  composite  Posttensioned  columns  Shake-table  test  Shape  memory  alloy Résumé : Three unconventional details for the plastic hinge regions of bridge columns subjected to seismic loads were developed, designed, and implemented in a large-scale, four-span RC bridge. Superelastic shape memory alloys (SMAs), engineered cementitious composites (ECCs), posttensioned columns, and elastomeric bearings were used in three different piers to improve the seismic performance of the bridge in terms of minimizing damage and reducing residual displacements. The bridge model was subjected to a series of biaxial earthquake excitations with increasing amplitudes. The experimental results showed that, besides being effective in reducing permanent displacement of the bridge, the high-performance materials and details substantially reduced the damage at plastic hinge regions and modified significantly other response parameters of the bents compared with conventional RC construction. Higher ductility was observed in the pier with the SMA/ECC combination, and larger load capacity was exhibited by the pier with elastomeric pads. While rotations at the plastic hinges with high-performance materials were significantly larger than those measured at plastic hinges made of conventional RC, the measured residual strains in the longitudinal reinforcement in the plastic hinges with innovative details were smaller than those observed in RC plastic hinges. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000611

Shake-table studies of a four-span bridge model with advanced materials / Carlos A. Cruz Noguez in Journal of structural engineering, Vol. 138 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 183-192 Titre : Shake-table studies of a four-span bridge model with advanced materials Type de document : texte imprimé Auteurs : Carlos A. Cruz Noguez, Auteur ; M. Saiid Saiidi, Auteur Année de publication : 2012 Article en page(s) : pp. 183-192 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Bridge  Damage  free  Earthquake  simulation  Engineered  cementitious  composite  Experimental  tests  Seismic  Shake  table  Shape  memory  alloys Résumé : As part of a major study on the seismic response of bridge systems with conventional and advanced details, a large-scale model of a 4-span bridge incorporating several innovative plastic hinges was recently tested on shake tables at the University of Nevada, Reno. The bridge model included six columns, each pair of which utilized a different unconventional detail at the bottom plastic hinges: shape memory alloys (SMAs), engineered cementitious composites (ECCs), elastomeric pads embedded into columns, and posttensioning tendons. The bridge model was subjected to two horizontal components of simulated earthquake records of the 1994 Northridge earthquake in California. More than 340 channels of data were collected. Test results showed the effectiveness of the innovative materials in reducing damage and permanent displacements. The damage was minimal in plastic hinges with SMA/ECC and those with built-in elastomeric pads. Conventional reinforced concrete plastic hinges were severely damaged because of spalling of concrete and rupture of longitudinal and transverse reinforcement. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p183_s1?isAuthorized=no [article] Shake-table studies of a four-span bridge model with advanced materials [texte imprimé] / Carlos A. Cruz Noguez, Auteur ; M. Saiid Saiidi, Auteur . - 2012 . - pp. 183-192. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 183-192 Mots-clés : Bridge  Damage  free  Earthquake  simulation  Engineered  cementitious  composite  Experimental  tests  Seismic  Shake  table  Shape  memory  alloys Résumé : As part of a major study on the seismic response of bridge systems with conventional and advanced details, a large-scale model of a 4-span bridge incorporating several innovative plastic hinges was recently tested on shake tables at the University of Nevada, Reno. The bridge model included six columns, each pair of which utilized a different unconventional detail at the bottom plastic hinges: shape memory alloys (SMAs), engineered cementitious composites (ECCs), elastomeric pads embedded into columns, and posttensioning tendons. The bridge model was subjected to two horizontal components of simulated earthquake records of the 1994 Northridge earthquake in California. More than 340 channels of data were collected. Test results showed the effectiveness of the innovative materials in reducing damage and permanent displacements. The damage was minimal in plastic hinges with SMA/ECC and those with built-in elastomeric pads. Conventional reinforced concrete plastic hinges were severely damaged because of spalling of concrete and rupture of longitudinal and transverse reinforcement. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p183_s1?isAuthorized=no