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Dynamic response reduction of cantilevered columns by anchored constrained viscoelastic layer treatments / Genda Chen in Journal of engineering mechanics, Vol. 138 N° 1 (Janvier 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 1 (Janvier 2012) . - pp.12-21 Titre : Dynamic response reduction of cantilevered columns by anchored constrained viscoelastic layer treatments Type de document : texte imprimé Auteurs : Genda Chen, Auteur ; Wenjian Wang, Auteur ; Kazi R. Karim, Auteur Année de publication : 2012 Article en page(s) : pp.12-21 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Anchored  constraining  layer,  Constrained-layer  treatment,  Viscoelastic  layers  Structural  dynamics  Distributed  damping  Distributed  mass  system Résumé : This paper proposes a new constrained viscoelastic (VE) layer treatment as a distributed supplemental damping mechanism for structural members. A steady-state solution of a cantilevered column utilizing this system is formulated under harmonic loading and validated with experimental shake table tests. Parametric studies indicated that the new treatment can reduce the elastic response of a 1/5 -scale square column up to 20%, or increase the damping ratio of the column from 2% to 2.5%. They remain effective as the column begins rocking at the column-footing construction joint. The numerical results were found to be in general agreement with the shake table test data of two column specimens with and without VE layers. On the basis of the validated model, applying two VE layers of 2.38 mm-thick to cover the lower 50–90% height of a cantilevered column appears the most efficient, and can increase the damping ratio up to 12% for a full-scale column. The significant reduction in peak responses indicates that the proposed new constrained-layer system is promising for civil engineering applications. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000299 [article] Dynamic response reduction of cantilevered columns by anchored constrained viscoelastic layer treatments [texte imprimé] / Genda Chen, Auteur ; Wenjian Wang, Auteur ; Kazi R. Karim, Auteur . - 2012 . - pp.12-21. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 1 (Janvier 2012) . - pp.12-21 Mots-clés : Anchored  constraining  layer,  Constrained-layer  treatment,  Viscoelastic  layers  Structural  dynamics  Distributed  damping  Distributed  mass  system Résumé : This paper proposes a new constrained viscoelastic (VE) layer treatment as a distributed supplemental damping mechanism for structural members. A steady-state solution of a cantilevered column utilizing this system is formulated under harmonic loading and validated with experimental shake table tests. Parametric studies indicated that the new treatment can reduce the elastic response of a 1/5 -scale square column up to 20%, or increase the damping ratio of the column from 2% to 2.5%. They remain effective as the column begins rocking at the column-footing construction joint. The numerical results were found to be in general agreement with the shake table test data of two column specimens with and without VE layers. On the basis of the validated model, applying two VE layers of 2.38 mm-thick to cover the lower 50–90% height of a cantilevered column appears the most efficient, and can increase the damping ratio up to 12% for a full-scale column. The significant reduction in peak responses indicates that the proposed new constrained-layer system is promising for civil engineering applications. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000299