Documents disponibles écrits par cet auteur

Damage-based design earthquake loads for single-degree-of-freedom inelastic structures / Abbas Moustafa 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. 456-467 Titre : Damage-based design earthquake loads for single-degree-of-freedom inelastic structures Type de document : texte imprimé Auteurs : Abbas Moustafa, Auteur Année de publication : 2011 Article en page(s) : pp. 456-467 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Design  earthquake  loads  Input  energy  Inelastic  structures  Ductility  ratio  Hysteretic  energy  Damage  indexes  Damage  spectra  Nonlinear  optimization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper develops a new framework for modeling design earthquake loads for inelastic structures. Limited information on strong ground motions is assumed to be available only at the given site. The design earthquake acceleration is expressed as a Fourier series, with unknown amplitude and phase angle, modulated by an envelope function. The design ground acceleration is estimated by solving an inverse dynamic problem, using nonlinear programming techniques, so that the structure performance is minimized. At the same time, the design earthquake is constrained to the available information on past recorded ground motions. New measures of the structure performance based on energy concepts and damage indexes are introduced in this paper. Specifically, the structural performance is quantified in terms of Park and Ang damage indexes. Damage indexes imply that the structure is damaged by a combination of repeated stress reversals and high-stress excursions. Furthermore, the use of damage indexes provides a measure on the structure damage level, and making a decision on necessary repair possible. The material stress-strain relationship is modeled as either bilinear or elastic-plastic. The formulation is demonstrated by deriving the design earthquake loads for inelastic frame structures at a firm soil site. The damage spectra for the site are also established, to provide upper bounds of damage under possible future earthquakes. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p456_s1?isAuthorized=no [article] Damage-based design earthquake loads for single-degree-of-freedom inelastic structures [texte imprimé] / Abbas Moustafa, Auteur . - 2011 . - pp. 456-467. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 456-467 Mots-clés : Design  earthquake  loads  Input  energy  Inelastic  structures  Ductility  ratio  Hysteretic  energy  Damage  indexes  Damage  spectra  Nonlinear  optimization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper develops a new framework for modeling design earthquake loads for inelastic structures. Limited information on strong ground motions is assumed to be available only at the given site. The design earthquake acceleration is expressed as a Fourier series, with unknown amplitude and phase angle, modulated by an envelope function. The design ground acceleration is estimated by solving an inverse dynamic problem, using nonlinear programming techniques, so that the structure performance is minimized. At the same time, the design earthquake is constrained to the available information on past recorded ground motions. New measures of the structure performance based on energy concepts and damage indexes are introduced in this paper. Specifically, the structural performance is quantified in terms of Park and Ang damage indexes. Damage indexes imply that the structure is damaged by a combination of repeated stress reversals and high-stress excursions. Furthermore, the use of damage indexes provides a measure on the structure damage level, and making a decision on necessary repair possible. The material stress-strain relationship is modeled as either bilinear or elastic-plastic. The formulation is demonstrated by deriving the design earthquake loads for inelastic frame structures at a firm soil site. The damage spectra for the site are also established, to provide upper bounds of damage under possible future earthquakes. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p456_s1?isAuthorized=no

Discussion of lsquoA new approach of selecting real input ground motions for seismic design: the most unfavourable real seismic design ground motionsrsquo by C-H Zhai and L-L Xie / Abbas Moustafa in Earthquake engineering structural dynamics, Vol. 38 N° 9 (Juillet 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 9 (Juillet 2009) . - pp. 1143-1149 Titre : Discussion of lsquoA new approach of selecting real input ground motions for seismic design: the most unfavourable real seismic design ground motionsrsquo by C-H Zhai and L-L Xie Type de document : texte imprimé Auteurs : Abbas Moustafa, Auteur Article en page(s) : pp. 1143-1149 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Design  accelerograms;  Entropy;  Resonant  acceleration;  Frequency  content;  Kanai-Tajimi;  Critical  record Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This discussion consists of two parts. The first part raises a few comments and questions on the method presented in the above paper. The second part proposes a measure for identifying resonant accelerograms in a set of earthquake records without the need for pre-processing of the records or inclusion of the structure dynamic analysis ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121587715/abstract [article] Discussion of lsquoA new approach of selecting real input ground motions for seismic design: the most unfavourable real seismic design ground motionsrsquo by C-H Zhai and L-L Xie [texte imprimé] / Abbas Moustafa, Auteur . - pp. 1143-1149. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 9 (Juillet 2009) . - pp. 1143-1149 Mots-clés : Design  accelerograms;  Entropy;  Resonant  acceleration;  Frequency  content;  Kanai-Tajimi;  Critical  record Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This discussion consists of two parts. The first part raises a few comments and questions on the method presented in the above paper. The second part proposes a measure for identifying resonant accelerograms in a set of earthquake records without the need for pre-processing of the records or inclusion of the structure dynamic analysis ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121587715/abstract