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Ajouter le résultat dans votre panierSeismic strengthening of RC columns using external steel cage / Nagaprasad, Pasala in Earthquake engineering structural dynamics, Vol. 38 N° 14 (Novembre 2009)
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
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - (pp. 1563-1586[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 Exemplaires
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Titre : Seismic reliability of V-braced frames: Influence of design methodologies Type de document : texte imprimé Auteurs : Longo, Alessandra, Auteur ; Montuori, Rosario, Auteur ; Piluso, Vincenzo, Auteur Article en page(s) : pp. 1587-1608 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cyclic behaviour V-braced frames Lobal mechanism Seismic reliability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : According to the most modern trend, performance-based seismic design is aimed at the evaluation of the seismic structural reliability defined as the mean annual frequency (MAF) of exceeding a threshold level of damage, i.e. a limit state. The methodology for the evaluation of the MAF of exceeding a limit state is herein applied with reference to concentrically V-braced steel frames designed according to different criteria. In particular, two design approaches are examined. The first approach corresponds to the provisions suggested by Eurocode 8 (prEN 1998 - Eurocode 8: design of structures for earthquake resistance. Part 1: general rules, seismic actions and rules for buildings), while the second approach is based on a rigorous application of capacity design criteria aiming at the control of the failure mode (J. Earthquake Eng. 2008; 12:1246-1266; J. Earthquake Eng. 2008; 12:728-759). The aim of the presented work is to focus on the seismic reliability obtained through these design methodologies. The probabilistic performance evaluation is based on an appropriate combination of probabilistic seismic hazard analysis, probabilistic seismic demand analysis (PSDA) and probabilistic seismic capacity analysis. Regarding PSDA, nonlinear dynamic analyses have been carried out in order to obtain the parameters describing the probability distribution laws of demand, conditioned to given values of the earthquake intensity measure. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1587-1608[article] Seismic reliability of V-braced frames: Influence of design methodologies [texte imprimé] / Longo, Alessandra, Auteur ; Montuori, Rosario, Auteur ; Piluso, Vincenzo, Auteur . - pp. 1587-1608.
Génie Civil
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1587-1608
Mots-clés : Cyclic behaviour V-braced frames Lobal mechanism Seismic reliability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : According to the most modern trend, performance-based seismic design is aimed at the evaluation of the seismic structural reliability defined as the mean annual frequency (MAF) of exceeding a threshold level of damage, i.e. a limit state. The methodology for the evaluation of the MAF of exceeding a limit state is herein applied with reference to concentrically V-braced steel frames designed according to different criteria. In particular, two design approaches are examined. The first approach corresponds to the provisions suggested by Eurocode 8 (prEN 1998 - Eurocode 8: design of structures for earthquake resistance. Part 1: general rules, seismic actions and rules for buildings), while the second approach is based on a rigorous application of capacity design criteria aiming at the control of the failure mode (J. Earthquake Eng. 2008; 12:1246-1266; J. Earthquake Eng. 2008; 12:728-759). The aim of the presented work is to focus on the seismic reliability obtained through these design methodologies. The probabilistic performance evaluation is based on an appropriate combination of probabilistic seismic hazard analysis, probabilistic seismic demand analysis (PSDA) and probabilistic seismic capacity analysis. Regarding PSDA, nonlinear dynamic analyses have been carried out in order to obtain the parameters describing the probability distribution laws of demand, conditioned to given values of the earthquake intensity measure. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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Titre : Rigid-plastic models for the seismic design and assessment of steel framed structures Type de document : texte imprimé Auteurs : Málaga-Chuquitaype, C., Auteur ; Elghazouli, A. Y., Auteur ; Bento, R., Auteur Article en page(s) : pp. 1609-1630 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Rigid-plastic analysis Moment-resisting frames Concentrically-braced Seismic design Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper demonstrates the applicability of response history analysis based on rigid-plastic models for the seismic assessment and design of steel buildings. The rigid-plastic force-deformation relationship as applied in steel moment-resisting frames (MRF) is re-examined and new rigid-plastic models are developed for concentrically-braced frames and dual structural systems consisting of MRF coupled with braced systems. This paper demonstrates that such rigid-plastic models are able to predict global seismic demands with reasonable accuracy. It is also shown that, the direct relationship that exists between peak displacement and the plastic capacity of rigid-plastic oscillators can be used to define the level of seismic demand for a given performance target. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1609-1630[article] Rigid-plastic models for the seismic design and assessment of steel framed structures [texte imprimé] / Málaga-Chuquitaype, C., Auteur ; Elghazouli, A. Y., Auteur ; Bento, R., Auteur . - pp. 1609-1630.
Génie Civil
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1609-1630
Mots-clés : Rigid-plastic analysis Moment-resisting frames Concentrically-braced Seismic design Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper demonstrates the applicability of response history analysis based on rigid-plastic models for the seismic assessment and design of steel buildings. The rigid-plastic force-deformation relationship as applied in steel moment-resisting frames (MRF) is re-examined and new rigid-plastic models are developed for concentrically-braced frames and dual structural systems consisting of MRF coupled with braced systems. This paper demonstrates that such rigid-plastic models are able to predict global seismic demands with reasonable accuracy. It is also shown that, the direct relationship that exists between peak displacement and the plastic capacity of rigid-plastic oscillators can be used to define the level of seismic demand for a given performance target. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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Titre : Coupled shear-bending formulation for seismic analysis of stacked wood shear wall systems Type de document : texte imprimé Auteurs : Pei, S., Auteur ; Van de Lindt, J. W., Auteur Article en page(s) : pp. 1631-1647) Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Multi-story light-frame wood building Hold-down system Stacked shear wall Shear-bending coupled model Light-frame wood Numerical model Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A summary of the development of a new coupled shear-bending model for analysis of stacked wood shear walls and multi-story wood-frame buildings is presented in this paper. The model focuses on dynamic response of light-frame wood structures under seismic excitation. The formulation is intended to provide a more versatile option than present pure shear models in that the new model is capable of accurately capturing the overall lateral response of each story diaphragm and separates the inter-story shear deformation and the deformation associated with rotation of the diaphragm due to rod elongation, which is an analogue to the bending deformation in an Euler-Bernoulli beam model. Modeling the coupling of bending and shear deformation is shown to provide more accurate representation of stacked shear wall system behavior than a pure shear model, particularly for the upper stories in the assembly. The formulation is coupled with the newly developed evolutionary parameter hysteretic model for wood shear walls. Existing data from a shake table test of an isolated three-story wood shear wall were used to verify the accuracy of the model prediction. The numerical results agreed very well with shake table test measurements. The influence of a continuous rod hold-down system on the dynamic behavior of the three-story stacked wood shear wall was also successfully simulated. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1631-1647)[article] Coupled shear-bending formulation for seismic analysis of stacked wood shear wall systems [texte imprimé] / Pei, S., Auteur ; Van de Lindt, J. W., Auteur . - pp. 1631-1647).
Génie Civil
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1631-1647)
Mots-clés : Multi-story light-frame wood building Hold-down system Stacked shear wall Shear-bending coupled model Light-frame wood Numerical model Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A summary of the development of a new coupled shear-bending model for analysis of stacked wood shear walls and multi-story wood-frame buildings is presented in this paper. The model focuses on dynamic response of light-frame wood structures under seismic excitation. The formulation is intended to provide a more versatile option than present pure shear models in that the new model is capable of accurately capturing the overall lateral response of each story diaphragm and separates the inter-story shear deformation and the deformation associated with rotation of the diaphragm due to rod elongation, which is an analogue to the bending deformation in an Euler-Bernoulli beam model. Modeling the coupling of bending and shear deformation is shown to provide more accurate representation of stacked shear wall system behavior than a pure shear model, particularly for the upper stories in the assembly. The formulation is coupled with the newly developed evolutionary parameter hysteretic model for wood shear walls. Existing data from a shake table test of an isolated three-story wood shear wall were used to verify the accuracy of the model prediction. The numerical results agreed very well with shake table test measurements. The influence of a continuous rod hold-down system on the dynamic behavior of the three-story stacked wood shear wall was also successfully simulated. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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Titre : Stability of central difference method for dynamic real-time substructure testing Type de document : texte imprimé Auteurs : Bin Wu, Auteur ; Deng; Lixia, Auteur Article en page(s) : pp. 1649-1663 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Real-time substructure test Stability Inertia force Central difference method Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper studies the stability of the central difference method (CDM) for real-time substructure test considering specimen mass. Because the standard CDM is implicit in terms of acceleration, to avoid iteration, an explicit acceleration formulation is assumed for its implementation in real-time dynamic substructure testing. The analytical work shows that the stability of the algorithm decreases with increasing specimen mass if the experimental substructure is a pure inertia specimen. The algorithm becomes unstable however small the time integration interval is, when the mass of specimen equal or greater than that of its numerical counterpart. For the case of dynamic specimen, the algorithm is unstable when there is no damping in the whole test structure; a damping will make the algorithm stable conditionally. Part of the analytical results is validated through an actual test. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1649-1663[article] Stability of central difference method for dynamic real-time substructure testing [texte imprimé] / Bin Wu, Auteur ; Deng; Lixia, Auteur . - pp. 1649-1663.
Génie Civil
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1649-1663
Mots-clés : Real-time substructure test Stability Inertia force Central difference method Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper studies the stability of the central difference method (CDM) for real-time substructure test considering specimen mass. Because the standard CDM is implicit in terms of acceleration, to avoid iteration, an explicit acceleration formulation is assumed for its implementation in real-time dynamic substructure testing. The analytical work shows that the stability of the algorithm decreases with increasing specimen mass if the experimental substructure is a pure inertia specimen. The algorithm becomes unstable however small the time integration interval is, when the mass of specimen equal or greater than that of its numerical counterpart. For the case of dynamic specimen, the algorithm is unstable when there is no damping in the whole test structure; a damping will make the algorithm stable conditionally. Part of the analytical results is validated through an actual test. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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