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Stability of central difference method for dynamic real-time substructure testing / Wu, Bin in Earthquake engineering structural dynamics, Vol. 38 N° 14 (Novembre 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 14 (Novembre 2009) . - pp. 1649-1663 Titre : Stability of central difference method for dynamic real-time substructure testing Type de document : texte imprimé Auteurs : Wu, Bin, 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 [article] Stability of central difference method for dynamic real-time substructure testing [texte imprimé] / Wu, Bin, 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