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Air-blast effects on structural shapes of finite width / Graeme J. Ballantyne in Journal of structural engineering, Vol. 136 N° 2 (Fevrier 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 2 (Fevrier 2010) . - pp. 152-159 Titre : Air-blast effects on structural shapes of finite width Type de document : texte imprimé Auteurs : Graeme J. Ballantyne, Auteur ; Andrew S. Whittaker, Auteur ; Gary F. Dargush, Auteur Année de publication : 2011 Article en page(s) : pp. 152-159 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Blast  loading  Clearing  Impulsive  loading  Extreme  loading Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In blast engineering, many designs begin with simplified hand procedures with the loading parameters determined based upon a reflective surface of infinite size. Individual structural members such as columns have finite widths and should be considered as finite surfaces for blast loading calculations. A study was performed to investigate the effect of finite flange width on blast loadings on structural components. The diffraction of a blast wave around the leading edges of the cross section and the propagation of rarefaction waves from the leading edges to the column centerline leads to a more rapid reduction in reflected pressure than that of an infinite surface: a process that is widely known as clearing. A series of analyses were performed using the computational fluid dynamics code Air3d. Peak reflected pressures are not changed by the “finiteness” of the section, although the reflected impulse can be substantially reduced by clearing. For a given charge mass, held constant for a range of stand-off distances, R, impulse is approximately proportional to 1/R when considering an infinite surface. If clearing is considered, the reflected impulse is still proportional to 1/R, but can be 50% lower than the value computed for an infinite surface, which has significant implications for blast resistant design of structural components. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i2/p152_s1?isAuthorized=no [article] Air-blast effects on structural shapes of finite width [texte imprimé] / Graeme J. Ballantyne, Auteur ; Andrew S. Whittaker, Auteur ; Gary F. Dargush, Auteur . - 2011 . - pp. 152-159. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 2 (Fevrier 2010) . - pp. 152-159 Mots-clés : Blast  loading  Clearing  Impulsive  loading  Extreme  loading Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In blast engineering, many designs begin with simplified hand procedures with the loading parameters determined based upon a reflective surface of infinite size. Individual structural members such as columns have finite widths and should be considered as finite surfaces for blast loading calculations. A study was performed to investigate the effect of finite flange width on blast loadings on structural components. The diffraction of a blast wave around the leading edges of the cross section and the propagation of rarefaction waves from the leading edges to the column centerline leads to a more rapid reduction in reflected pressure than that of an infinite surface: a process that is widely known as clearing. A series of analyses were performed using the computational fluid dynamics code Air3d. Peak reflected pressures are not changed by the “finiteness” of the section, although the reflected impulse can be substantially reduced by clearing. For a given charge mass, held constant for a range of stand-off distances, R, impulse is approximately proportional to 1/R when considering an infinite surface. If clearing is considered, the reflected impulse is still proportional to 1/R, but can be 50% lower than the value computed for an infinite surface, which has significant implications for blast resistant design of structural components. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i2/p152_s1?isAuthorized=no