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Estimation d'accelerogrammes spatialement variables sur profils de sols stochastiques / Afif Chaouche, Karim

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Titre : Estimation d'accelerogrammes spatialement variables sur profils de sols stochastiques : application au seisme d'el asnam de 1980
Type de document : texte imprimé
Auteurs : Afif Chaouche, Karim, Auteur ; Tiliouine, Boualem, Directeur de thèse
Editeur : [S.l.] : [s.n.]
Année de publication : 2017
Importance : 116 f.
Présentation : ill.
Format : 30 cm
Accompagnement : 1 CD-ROM.
Note générale : Thèse de Doctorat : Génie civil : Alger, Ecole Nationale Polytechnique: 2017
Bibliogr. f. 110 - 114 . Annexe f. 116
Langues : Anglais (eng)
Mots-clés : Ground motion simulation
Green’s function
Finite-source
Coherency
Random soil
Index. décimale : D001017
Résumé : Spatial variability of ground motions has significant influence on dynamic response of extended structures such as pipelines and bridges.
When carrying out seismic design of structures, reasonable definition of earthquake ground motions is crucial to structural response analysis.
Although a large number of earthquakes have been recorded in the past decades, the site conditions where these earthquakes occured may be much different from those of the structures.
In this study, the widely used finite-source empirical Green’s function (EGF) method is extended to synthesize seismic motions across an array of stations located at bedrock in the epicentral region of the 1980 El-Asnam earthquake (North-west Algeria).
A parametric model of coherency is presented for base rock based on the simulation results.
A Parametric study investigating the sensitivity of coherency to seismic source, propagation path and site conditions, is conducted by using the extended hybrid Green’s function method.
The corresponding spatial coherency functions of surface seismic motions at the ElAsnam Sogedia site are calculated using the analytic site specific model developed in the Zerva and Harada approach for a layered, random soil site.
A stochastic generation of time histories at various locations on the ground surface of the site, compatible with our estimations of the target power spectral densities and the spatial coherency functions, is presented.
The obtained results show that finite-source effects can cause significant loss of coherency at bedrock in the near-field.
The layer stochasticity can significantly reduce, or greatly reduce for medium to large separation distances, the coherency near the sites resonant frequency, even for firm soil conditions when its damping ratio is low.
For these soil conditions, the layer stochasticity controls the seismic ground strains.

Estimation d'accelerogrammes spatialement variables sur profils de sols stochastiques : application au seisme d'el asnam de 1980 [texte imprimé] / Afif Chaouche, Karim, Auteur ; Tiliouine, Boualem, Directeur de thèse . - [S.l.] : [s.n.], 2017 . - 116 f. : ill. ; 30 cm + 1 CD-ROM.
Thèse de Doctorat : Génie civil : Alger, Ecole Nationale Polytechnique: 2017
Bibliogr. f. 110 - 114 . Annexe f. 116
Langues : Anglais (eng)
Mots-clés : Ground motion simulation
Green’s function
Finite-source
Coherency
Random soil
Index. décimale : D001017
Résumé : Spatial variability of ground motions has significant influence on dynamic response of extended structures such as pipelines and bridges.
When carrying out seismic design of structures, reasonable definition of earthquake ground motions is crucial to structural response analysis.
Although a large number of earthquakes have been recorded in the past decades, the site conditions where these earthquakes occured may be much different from those of the structures.
In this study, the widely used finite-source empirical Green’s function (EGF) method is extended to synthesize seismic motions across an array of stations located at bedrock in the epicentral region of the 1980 El-Asnam earthquake (North-west Algeria).
A parametric model of coherency is presented for base rock based on the simulation results.
A Parametric study investigating the sensitivity of coherency to seismic source, propagation path and site conditions, is conducted by using the extended hybrid Green’s function method.
The corresponding spatial coherency functions of surface seismic motions at the ElAsnam Sogedia site are calculated using the analytic site specific model developed in the Zerva and Harada approach for a layered, random soil site.
A stochastic generation of time histories at various locations on the ground surface of the site, compatible with our estimations of the target power spectral densities and the spatial coherency functions, is presented.
The obtained results show that finite-source effects can cause significant loss of coherency at bedrock in the near-field.
The layer stochasticity can significantly reduce, or greatly reduce for medium to large separation distances, the coherency near the sites resonant frequency, even for firm soil conditions when its damping ratio is low.
For these soil conditions, the layer stochasticity controls the seismic ground strains.

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T000020 D001017 Papier + ressource électronique Bibliothèque Annexe Thèse de Doctorat Disponible Genie_civil Consultation sur place/Téléchargeable
T000019 D001017 Papier + ressource électronique Bibliothèque centrale Thèse de Doctorat Disponible Genie_civil Consultation sur place/Téléchargeable

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Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
T000020	D001017	Papier + ressource électronique	Bibliothèque Annexe	Thèse de Doctorat	Disponible	Genie_civil	Consultation sur place/Téléchargeable
T000019	D001017	Papier + ressource électronique	Bibliothèque centrale	Thèse de Doctorat	Disponible	Genie_civil	Consultation sur place/Téléchargeable