Documents disponibles écrits par cet auteur

Dynamic characteristics of SDOF structure with maxwell element / Kazuhiko Yamada in Journal of engineering mechanics, Vol. 134 N°5 (Mai 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 N°5 (Mai 2008) . - pp.396–404. Titre : Dynamic characteristics of SDOF structure with maxwell element Type de document : texte imprimé Auteurs : Kazuhiko Yamada, Auteur Année de publication : 2008 Article en page(s) : pp.396–404. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Optimization  Eigenvalues  Damping  Stiffness  Coefficients  Transient  response  Structural  dynamics Résumé : Dynamic characteristics are analytically investigated for a single degree of freedom structure with a Maxwell element (SSME). Eigenvalues are obtained analytically and approximated by a perturbation method. Then, cases are sorted by a stiffness ratio λ : the ratio of a structural spring to an auxiliary spring. For a small λ , the optimal damping ϕc provides the maximum damping ratio. For a large λ , the lower and upper critical dampings ϕa and ϕb provide duplex eigenvalues. These values are approximated by simple terms. To reduce transient response, λ should be large, and ϕ should be around ϕc , ϕa , and ϕb , which provide the SSME with large damping. For a stationary excitation, the optimal damping ϕd is introduced to produce the minimum peak deformation. In fact, ϕd is larger than ϕc and ϕb , and provides larger stiffness and a smaller damping ratio. For a seismic excitation, some cases with ϕd might reduce deformation more than those with ϕc and ϕb , but must support larger stress in the Maxwell element. Thus, ϕ should be based on design constraints. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A5%2839 [...] [article] Dynamic characteristics of SDOF structure with maxwell element [texte imprimé] / Kazuhiko Yamada, Auteur . - 2008 . - pp.396–404. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N°5 (Mai 2008) . - pp.396–404. Mots-clés : Optimization  Eigenvalues  Damping  Stiffness  Coefficients  Transient  response  Structural  dynamics Résumé : Dynamic characteristics are analytically investigated for a single degree of freedom structure with a Maxwell element (SSME). Eigenvalues are obtained analytically and approximated by a perturbation method. Then, cases are sorted by a stiffness ratio λ : the ratio of a structural spring to an auxiliary spring. For a small λ , the optimal damping ϕc provides the maximum damping ratio. For a large λ , the lower and upper critical dampings ϕa and ϕb provide duplex eigenvalues. These values are approximated by simple terms. To reduce transient response, λ should be large, and ϕ should be around ϕc , ϕa , and ϕb , which provide the SSME with large damping. For a stationary excitation, the optimal damping ϕd is introduced to produce the minimum peak deformation. In fact, ϕd is larger than ϕc and ϕb , and provides larger stiffness and a smaller damping ratio. For a seismic excitation, some cases with ϕd might reduce deformation more than those with ϕc and ϕb , but must support larger stress in the Maxwell element. Thus, ϕ should be based on design constraints. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A5%2839 [...]