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Analysis of tall buildings with damped outriggers / Y. Chen in Journal of structural engineering, Vol. 136 N° 11 (Novembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1435-1443 Titre : Analysis of tall buildings with damped outriggers Type de document : texte imprimé Auteurs : Y. Chen, Auteur ; D. M. McFarland, Auteur ; Z. Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 1435-1443 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Free  vibration  Intermediate  rotational  damper  Closed-form  analytical  solution  Numerical  iteration  scheme  Optimal  damping  and  position Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A novel damped outrigger system has been recently proposed for tall buildings, and is quite promising. To gain insight into the conceptual design of such systems, a simple beam-damper system model for a building with such dampers installed is developed and studied. A partial differential equation governing the motion is derived assuming a Bernoulli-Euler beam. A closed-form analytical solution is developed for vibration of the beam by analyzing the regions above and below the damper separately using separation of variables. By applying appropriate boundary conditions at the ends, a transcendental characteristic equation is obtained that governs the system’s complex natural frequencies. An explicit form for the complex mode shape is determined for dynamic analysis. A numerical iteration scheme is adopted to solve the characteristic equation for the complex eigenvalues (i.e., the system modal frequencies and damping ratios). This solution was used to determine design curves for optimal damper position and size. For engineering convenience, empirical equations were provided by fitting numerical results. These equations include one for determining the optimal location of the damper for each mode, and two for determining the optimal damping coefficient of the damper, and for calculating the maximum modal damping ratio of the system while the beam vibrates in its first mode. Furthermore, relatively accurate approximations of the pseudoundamped natural frequency and damping ratio of the first mode were obtained using a Taylor expansion of the characteristic equation. All of the results obtained are nondimensionalized for convenience of analysis and application. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1435_s1?isAuthorized=no [article] Analysis of tall buildings with damped outriggers [texte imprimé] / Y. Chen, Auteur ; D. M. McFarland, Auteur ; Z. Wang, Auteur . - 2011 . - pp. 1435-1443. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1435-1443 Mots-clés : Free  vibration  Intermediate  rotational  damper  Closed-form  analytical  solution  Numerical  iteration  scheme  Optimal  damping  and  position Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A novel damped outrigger system has been recently proposed for tall buildings, and is quite promising. To gain insight into the conceptual design of such systems, a simple beam-damper system model for a building with such dampers installed is developed and studied. A partial differential equation governing the motion is derived assuming a Bernoulli-Euler beam. A closed-form analytical solution is developed for vibration of the beam by analyzing the regions above and below the damper separately using separation of variables. By applying appropriate boundary conditions at the ends, a transcendental characteristic equation is obtained that governs the system’s complex natural frequencies. An explicit form for the complex mode shape is determined for dynamic analysis. A numerical iteration scheme is adopted to solve the characteristic equation for the complex eigenvalues (i.e., the system modal frequencies and damping ratios). This solution was used to determine design curves for optimal damper position and size. For engineering convenience, empirical equations were provided by fitting numerical results. These equations include one for determining the optimal location of the damper for each mode, and two for determining the optimal damping coefficient of the damper, and for calculating the maximum modal damping ratio of the system while the beam vibrates in its first mode. Furthermore, relatively accurate approximations of the pseudoundamped natural frequency and damping ratio of the first mode were obtained using a Taylor expansion of the characteristic equation. All of the results obtained are nondimensionalized for convenience of analysis and application. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1435_s1?isAuthorized=no

Corrosion resistant performances of Al-rich epoxy resin based paint on arc-sprayed Al coating / Z. Wang in Materials and corrosion, Vol. 61 N° 2 (Fevrier 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 2 (Fevrier 2010) . - pp. 152–156 Titre : Corrosion resistant performances of Al-rich epoxy resin based paint on arc-sprayed Al coating Type de document : texte imprimé Auteurs : Z. Wang, Auteur ; L. M. Liu, Auteur Année de publication : 2010 Article en page(s) : pp. 152–156 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Al-rich  epoxy  resin  based  paint;  coatings;  corrosion  resistance;  penetration Résumé : Electrical conductive Al-rich epoxy resin based paint with an acceptable surface was for the first time prepared on an arc-sprayed aluminium coating surface successfully. Adhesion test and salt solution immersion test (SSIT) with complementary measurements including electron probe microanalysis (EPMA) and Raman spectroscopy were employed. Adhesion properties of the epoxy resin pigmented with Al particles did not degrade. Besides, because of the close Al particle–resin integration and the tight adhesion in the paint–coating interface, the strong adherence of corrosion products on Al particles, as well as probable passivation of Al particles, the paint showed no worse corrosion resistance properties than the epoxy resin and corroded at a similar rate to the epoxy resin, uniformly, slowly and slightly, protecting the coating base as a barrier type film. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905242/abstract [article] Corrosion resistant performances of Al-rich epoxy resin based paint on arc-sprayed Al coating [texte imprimé] / Z. Wang, Auteur ; L. M. Liu, Auteur . - 2010 . - pp. 152–156. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 2 (Fevrier 2010) . - pp. 152–156 Mots-clés : Al-rich  epoxy  resin  based  paint;  coatings;  corrosion  resistance;  penetration Résumé : Electrical conductive Al-rich epoxy resin based paint with an acceptable surface was for the first time prepared on an arc-sprayed aluminium coating surface successfully. Adhesion test and salt solution immersion test (SSIT) with complementary measurements including electron probe microanalysis (EPMA) and Raman spectroscopy were employed. Adhesion properties of the epoxy resin pigmented with Al particles did not degrade. Besides, because of the close Al particle–resin integration and the tight adhesion in the paint–coating interface, the strong adherence of corrosion products on Al particles, as well as probable passivation of Al particles, the paint showed no worse corrosion resistance properties than the epoxy resin and corroded at a similar rate to the epoxy resin, uniformly, slowly and slightly, protecting the coating base as a barrier type film. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905242/abstract