Documents disponibles écrits par cet auteur

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

Effects of large cumulative travel on the behavior of lead-rubber seismic isolation bearings / Ioannis V. Kalpakidis in Journal of structural engineering, Vol. 136 N° 5 (Mai 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 491-501 Titre : Effects of large cumulative travel on the behavior of lead-rubber seismic isolation bearings Type de document : texte imprimé Auteurs : Ioannis V. Kalpakidis, Auteur ; Constantinou, Michael C., Auteur ; Andrew S. Whittaker, Auteur Année de publication : 2011 Article en page(s) : pp. 491-501 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Lead-rubber  bearing  Cumulative  travel  Service  load  Thermal  load  Strain  hardening  Characteristic  strength  Recrystallization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Lead-rubber bearings are seismic isolators that have been used extensively to protect buildings, bridges, and mission-critical infrastructure from the damaging effects of earthquake shaking. In bridges, lead-rubber bearings are subjected to continuous movement due to service (traffic) and temperature effects. This paper presents data on the effects of cumulative travel on the mechanical properties of lead-rubber bearings based on an experimental investigation of both medium- and small-sized bearings. A theoretical interpretation of the test results is presented. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i5/p491_s1?isAuthorized=no [article] Effects of large cumulative travel on the behavior of lead-rubber seismic isolation bearings [texte imprimé] / Ioannis V. Kalpakidis, Auteur ; Constantinou, Michael C., Auteur ; Andrew S. Whittaker, Auteur . - 2011 . - pp. 491-501. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 491-501 Mots-clés : Lead-rubber  bearing  Cumulative  travel  Service  load  Thermal  load  Strain  hardening  Characteristic  strength  Recrystallization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Lead-rubber bearings are seismic isolators that have been used extensively to protect buildings, bridges, and mission-critical infrastructure from the damaging effects of earthquake shaking. In bridges, lead-rubber bearings are subjected to continuous movement due to service (traffic) and temperature effects. This paper presents data on the effects of cumulative travel on the mechanical properties of lead-rubber bearings based on an experimental investigation of both medium- and small-sized bearings. A theoretical interpretation of the test results is presented. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i5/p491_s1?isAuthorized=no

Estimating rotational components of ground motion using data recorded at a single station / Dhiman Basu in Journal of engineering mechanics, Vol. 138 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1141–1156. Titre : Estimating rotational components of ground motion using data recorded at a single station Type de document : texte imprimé Auteurs : Dhiman Basu, Auteur ; Andrew S. Whittaker, Auteur ; Michael C. Constantinou, Auteur Année de publication : 2012 Article en page(s) : pp.1141–1156. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Earthquake  Ground  motion  Rotation  Wave  propagation  Single  recording  station  Codes Résumé : Seismic analysis, design, and performance assessment of buildings, bridges, and safety-related nuclear structures is based on two or three translational components of earthquake ground motion. Although rotational components (rocking and torsional) may contribute significantly to translational and torsional response and damage, they are not considered in design and assessment because their intensity and frequency content are not measured by accelerograms deployed in the free field. A method for developing rotational time series by first deconstructing the three translational time series of a ground motion recorded at one station into body waves is presented in this paper. The body waves are then reassembled to generate rotational time series. Point and line source representations of the fault rupture are considered. Results of the single station procedure are presented using rotational acceleration spectra and compared with the multiple-station-based geodetic method. The spectra are similar at periods greater than 1 s. The spectral ordinates computed using the geodetic method are significantly smaller at shorter periods, which is attributed to the underlying assumption of a plane surface for the recorded data at any time instant in the method. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000408 [article] Estimating rotational components of ground motion using data recorded at a single station [texte imprimé] / Dhiman Basu, Auteur ; Andrew S. Whittaker, Auteur ; Michael C. Constantinou, Auteur . - 2012 . - pp.1141–1156. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1141–1156. Mots-clés : Earthquake  Ground  motion  Rotation  Wave  propagation  Single  recording  station  Codes Résumé : Seismic analysis, design, and performance assessment of buildings, bridges, and safety-related nuclear structures is based on two or three translational components of earthquake ground motion. Although rotational components (rocking and torsional) may contribute significantly to translational and torsional response and damage, they are not considered in design and assessment because their intensity and frequency content are not measured by accelerograms deployed in the free field. A method for developing rotational time series by first deconstructing the three translational time series of a ground motion recorded at one station into body waves is presented in this paper. The body waves are then reassembled to generate rotational time series. Point and line source representations of the fault rupture are considered. Results of the single station procedure are presented using rotational acceleration spectra and compared with the multiple-station-based geodetic method. The spectra are similar at periods greater than 1 s. The spectral ordinates computed using the geodetic method are significantly smaller at shorter periods, which is attributed to the underlying assumption of a plane surface for the recorded data at any time instant in the method. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000408

Scaling earthquake ground motions for performance-based assessment of buildings / Yin-Nan Huang in Journal of structural engineering, Vol. 137 N° 3 (Mars 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 311-321 Titre : Scaling earthquake ground motions for performance-based assessment of buildings Type de document : texte imprimé Auteurs : Yin-Nan Huang, Auteur ; Andrew S. Whittaker, Auteur ; Nicolas Luco, Auteur Année de publication : 2011 Article en page(s) : pp. 311-321 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Ground  motion  Response  spectra  Scale  Seismic  design  Time-series  analysis Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The impact of alternate ground-motion scaling procedures on the distribution of displacement responses in simplified structural systems is investigated. Recommendations are provided for selecting and scaling ground motions for performance-based assessment of buildings. Four scaling methods are studied, namely, (1) geometric-mean scaling of pairs of ground motions, (2) spectrum matching of ground motions, (3) first-mode-period scaling to a target spectral acceleration, and (4) scaling of ground motions per the distribution of spectral demands. Data were developed by nonlinear response-history analysis of a large family of nonlinear single degree-of-freedom (SDOF) oscillators that could represent fixed-base and base-isolated structures. The advantages and disadvantages of each scaling method are discussed. The relationship between spectral shape and a ground-motion randomness parameter, ε, is presented. A scaling procedure that explicitly considers spectral shape is proposed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p311_s1?isAuthorized=no [article] Scaling earthquake ground motions for performance-based assessment of buildings [texte imprimé] / Yin-Nan Huang, Auteur ; Andrew S. Whittaker, Auteur ; Nicolas Luco, Auteur . - 2011 . - pp. 311-321. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 311-321 Mots-clés : Ground  motion  Response  spectra  Scale  Seismic  design  Time-series  analysis Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The impact of alternate ground-motion scaling procedures on the distribution of displacement responses in simplified structural systems is investigated. Recommendations are provided for selecting and scaling ground motions for performance-based assessment of buildings. Four scaling methods are studied, namely, (1) geometric-mean scaling of pairs of ground motions, (2) spectrum matching of ground motions, (3) first-mode-period scaling to a target spectral acceleration, and (4) scaling of ground motions per the distribution of spectral demands. Data were developed by nonlinear response-history analysis of a large family of nonlinear single degree-of-freedom (SDOF) oscillators that could represent fixed-base and base-isolated structures. The advantages and disadvantages of each scaling method are discussed. The relationship between spectral shape and a ground-motion randomness parameter, ε, is presented. A scaling procedure that explicitly considers spectral shape is proposed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p311_s1?isAuthorized=no

Seismic demands on secondary systems in base-isolated nuclear power plants / Yin-Nan Huang in Earthquake engineering structural dynamics, Vol. 36 N°12 (Octobre 2007) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 36 N°12 (Octobre 2007) . - 1741-1761 p. Titre : Seismic demands on secondary systems in base-isolated nuclear power plants Type de document : texte imprimé Auteurs : Yin-Nan Huang, Auteur ; Andrew S. Whittaker, Auteur ; Constantinou, Michael C., Auteur Article en page(s) : 1741-1761 p. Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : nuclear  power  plant  secondary  systems  seismic  base  isolation  viscous  dampers  performance  spacesCentrale  nucléaire  Systèmes  secondaires  Base  de  l'isolement  sismique  Des  amortisseurs  visqueux  Performance  des  espaces Index. décimale : 624.151 Résumé : Numerical models of a sample nuclear power plant (NPP) reactor building, both conventionally constructed and equipped with seismic protective systems, are analysed for both safe shutdown and beyond-design-basis earthquake shaking at two coastal sites in the United States. Seismic demands on secondary systems are established for the conventional and seismically isolated NPPs. The reductions in secondary-system acceleration and deformation demands afforded by the isolation systems are identified. Performance spaces are introduced as an alternate method for evaluating demands on secondary systems. The results show that isolation systems greatly reduce both the median and dispersion of seismic demands on secondary systems in NPPs. Les modèles numériques d'un échantillon de centrales nucléaires (NPP) bâtiment réacteur, à la fois conventionnelle construits et équipés de systèmes de protection sismique, sont analysés à la fois pour arrêt en sécurité au-delà de la conception et de base tremblement de terre tremblait à deux sites côtiers et les États-Unis. Seismic exigences sur les systèmes secondaires sont fixés pour les isolés et sismiques conventionnelles des centrales nucléaires. Les réductions dans le secondaire-système d'accélération et de déformation exigences offertes par les systèmes d'isolation sont identifiés. Performance espaces sont introduits comme une autre méthode d'évaluation des demandes de systèmes secondaires. Les résultats montrent que les systèmes d'isolation grandement réduire à la fois la médiane et la dispersion de la demande sur sismiques secondaires dans les systèmes des centrales nucléaires. DEWEY : 551.2 ISSN : 0098-8847 RAMEAU : Séisme En ligne : http://www3.interscience.wiley.com/cgi-bin/abstract/114291261/ABSTRACT [article] Seismic demands on secondary systems in base-isolated nuclear power plants [texte imprimé] / Yin-Nan Huang, Auteur ; Andrew S. Whittaker, Auteur ; Constantinou, Michael C., Auteur . - 1741-1761 p. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 36 N°12 (Octobre 2007) . - 1741-1761 p. Mots-clés : nuclear  power  plant  secondary  systems  seismic  base  isolation  viscous  dampers  performance  spacesCentrale  nucléaire  Systèmes  secondaires  Base  de  l'isolement  sismique  Des  amortisseurs  visqueux  Performance  des  espaces Index. décimale : 624.151 Résumé : Numerical models of a sample nuclear power plant (NPP) reactor building, both conventionally constructed and equipped with seismic protective systems, are analysed for both safe shutdown and beyond-design-basis earthquake shaking at two coastal sites in the United States. Seismic demands on secondary systems are established for the conventional and seismically isolated NPPs. The reductions in secondary-system acceleration and deformation demands afforded by the isolation systems are identified. Performance spaces are introduced as an alternate method for evaluating demands on secondary systems. The results show that isolation systems greatly reduce both the median and dispersion of seismic demands on secondary systems in NPPs. Les modèles numériques d'un échantillon de centrales nucléaires (NPP) bâtiment réacteur, à la fois conventionnelle construits et équipés de systèmes de protection sismique, sont analysés à la fois pour arrêt en sécurité au-delà de la conception et de base tremblement de terre tremblait à deux sites côtiers et les États-Unis. Seismic exigences sur les systèmes secondaires sont fixés pour les isolés et sismiques conventionnelles des centrales nucléaires. Les réductions dans le secondaire-système d'accélération et de déformation exigences offertes par les systèmes d'isolation sont identifiés. Performance espaces sont introduits comme une autre méthode d'évaluation des demandes de systèmes secondaires. Les résultats montrent que les systèmes d'isolation grandement réduire à la fois la médiane et la dispersion de la demande sur sismiques secondaires dans les systèmes des centrales nucléaires. DEWEY : 551.2 ISSN : 0098-8847 RAMEAU : Séisme En ligne : http://www3.interscience.wiley.com/cgi-bin/abstract/114291261/ABSTRACT