Seismic strengthening of RC columns using external steel cage / Nagaprasad, Pasala in Earthquake engineering structural dynamics, Vol. 38 N° 14 (Novembre 2009)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - (pp. 1563-1586 Titre : Seismic strengthening of RC columns using external steel cage Type de document : texte imprimé Auteurs : Nagaprasad, Pasala, Auteur ; Sahoo, Dipti Ranjan, Auteur ; Rai, Durgesh C., Auteur Article en page(s) : (pp. 1563-1586 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : RC column  Seismic strengthening  Confinement  Hatten  Steel caging  Cyclic lateral load Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Steel caging technique is commonly used for the seismic strengthening of reinforced concrete (RC) columns of rectangular cross-section. The steel cage consists of angle sections placed at corners and held together by battens at intervals along the height. In the present study, a rational design method is developed to proportion the steel cage considering its confinement effect on the column concrete. An experimental study was carried out to verify the effectiveness of the proposed design method and detailing of steel cage battens within potential plastic hinge regions. One ordinary RC column and two strengthened columns were investigated experimentally under constant axial compressive load and gradually increasing reversed cyclic lateral displacements. Both strengthened columns showed excellent behavior in terms of flexural strength, lateral stiffness, energy dissipation and ductility due to the external confinement of the column concrete. The proposed model for confinement effect due to steel cage reasonably predicted moment capacities of the strengthened sections, which matched with the observed experimental values. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Seismic strengthening of RC columns using external steel cage [texte imprimé] / Nagaprasad, Pasala, Auteur ; Sahoo, Dipti Ranjan, Auteur ; Rai, Durgesh C., Auteur . - (pp. 1563-1586. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - (pp. 1563-1586 Mots-clés : RC column  Seismic strengthening  Confinement  Hatten  Steel caging  Cyclic lateral load Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Steel caging technique is commonly used for the seismic strengthening of reinforced concrete (RC) columns of rectangular cross-section. The steel cage consists of angle sections placed at corners and held together by battens at intervals along the height. In the present study, a rational design method is developed to proportion the steel cage considering its confinement effect on the column concrete. An experimental study was carried out to verify the effectiveness of the proposed design method and detailing of steel cage battens within potential plastic hinge regions. One ordinary RC column and two strengthened columns were investigated experimentally under constant axial compressive load and gradually increasing reversed cyclic lateral displacements. Both strengthened columns showed excellent behavior in terms of flexural strength, lateral stiffness, energy dissipation and ductility due to the external confinement of the column concrete. The proposed model for confinement effect due to steel cage reasonably predicted moment capacities of the strengthened sections, which matched with the observed experimental values. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe

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