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Auteur Stefan Hurlebaus |
Documents disponibles écrits par cet auteur (4)



Control of a seismically excited benchmark building using linear matrix inequality-based semiactive nonlinear fuzzy control / Yeesock Kim in Journal of structural engineering, Vol. 136 N° 8 (Août 2010)
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[article]
inJournal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 1023-1026
Titre : Control of a seismically excited benchmark building using linear matrix inequality-based semiactive nonlinear fuzzy control Type de document : texte imprimé Auteurs : Yeesock Kim, Auteur ; Reza Langari, Auteur ; Stefan Hurlebaus, Auteur Année de publication : 2011 Article en page(s) : pp. 1023-1026 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Semiactive nonlinear fuzzy control (SNFC) Linear matrix inequalities (LMIs) Magnetorheological (MR) damper Benchmark Earthquake Model-based Fuzzy logic controller (MBFLC) Model-free (MFFLC) Vibration Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper investigates the behavior of a seismically excited benchmark building employing magnetorheological dampers operated by a model-based fuzzy logic controller (MBFLC) formulated in terms of linear matrix inequalities (LMIs). The MBFLC is designed in a systematic way, while the traditional model-free fuzzy logic controller is designed via trial and error by experienced investigators. It is demonstrated from comparison of the uncontrolled and semiactive controlled responses that the proposed LMI-based MBFLC is effective in vibration reduction of a benchmark building under various earthquake loading conditions.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p1023_s1?isAuthorized=no [article] Control of a seismically excited benchmark building using linear matrix inequality-based semiactive nonlinear fuzzy control [texte imprimé] / Yeesock Kim, Auteur ; Reza Langari, Auteur ; Stefan Hurlebaus, Auteur . - 2011 . - pp. 1023-1026.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 1023-1026
Mots-clés : Semiactive nonlinear fuzzy control (SNFC) Linear matrix inequalities (LMIs) Magnetorheological (MR) damper Benchmark Earthquake Model-based Fuzzy logic controller (MBFLC) Model-free (MFFLC) Vibration Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper investigates the behavior of a seismically excited benchmark building employing magnetorheological dampers operated by a model-based fuzzy logic controller (MBFLC) formulated in terms of linear matrix inequalities (LMIs). The MBFLC is designed in a systematic way, while the traditional model-free fuzzy logic controller is designed via trial and error by experienced investigators. It is demonstrated from comparison of the uncontrolled and semiactive controlled responses that the proposed LMI-based MBFLC is effective in vibration reduction of a benchmark building under various earthquake loading conditions.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p1023_s1?isAuthorized=no Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Probabilistic capacity models and fragility estimates for reinforced concrete columns incorporating NDT data / Qindan Huang in Journal of engineering mechanics, Vol. 135 N° 12 (Décembre 2009)
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[article]
inJournal of engineering mechanics > Vol. 135 N° 12 (Décembre 2009) . - pp. 1384-1392
Titre : Probabilistic capacity models and fragility estimates for reinforced concrete columns incorporating NDT data Type de document : texte imprimé Auteurs : Qindan Huang, Auteur ; Paolo Gardoni, Auteur ; Stefan Hurlebaus, Auteur Article en page(s) : pp. 1384-1392 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Bridges Probability Nondestructive tests Concrete columns Reinforced concrete. Résumé : Knowing the ability of reinforced concrete (RC) bridges to withstand future seismic demands during their life-cycle can help bridge owners make rational decisions regarding optimal allocation of resources for maintenance, repair, and/or rehabilitation of bridge systems. The accuracy of a reliability assessment can be improved by incorporating information about the current aging and deterioration conditions of a bridge. Nondestructive testing (NDT) can be used to evaluate the actual conditions of a bridge, avoiding the use of deterioration models that bring additional uncertainties in the reliability assessment. This paper develops probabilistic deformation and shear capacity models for RC bridge columns that incorporate information obtained from NDT. The proposed models can be used when the flexural stiffness decays nonuniformly over a column height. The flexural stiffness of a column is estimated based on measured acceleration responses using a system identification method and the damage index method. As an application of the proposed models, a case study assesses the fragility (the conditional probability of attaining or exceeding a specified capacity level) of the column in the Lavic Road Overcrossing for a given deformation or shear demand. This two-span concrete box-girder bridge located in Southern California was subject to the Hector Mine Earthquake in 1999. Pre- and postearthquake estimates of the univariate shear and deformation fragilities and of the bivariate shear-deformation fragility are computed and compared. Both displacement and shear capacities are found to decrease after the earthquake event. Additionally, the results show that the damage due to the Hector Mine Earthquake has a larger impact on the shear capacity than the deformation capacity, leading to a more significant increment in the shear fragility than in the deformation fragility. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Probabilistic capacity models and fragility estimates for reinforced concrete columns incorporating NDT data [texte imprimé] / Qindan Huang, Auteur ; Paolo Gardoni, Auteur ; Stefan Hurlebaus, Auteur . - pp. 1384-1392.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 135 N° 12 (Décembre 2009) . - pp. 1384-1392
Mots-clés : Bridges Probability Nondestructive tests Concrete columns Reinforced concrete. Résumé : Knowing the ability of reinforced concrete (RC) bridges to withstand future seismic demands during their life-cycle can help bridge owners make rational decisions regarding optimal allocation of resources for maintenance, repair, and/or rehabilitation of bridge systems. The accuracy of a reliability assessment can be improved by incorporating information about the current aging and deterioration conditions of a bridge. Nondestructive testing (NDT) can be used to evaluate the actual conditions of a bridge, avoiding the use of deterioration models that bring additional uncertainties in the reliability assessment. This paper develops probabilistic deformation and shear capacity models for RC bridge columns that incorporate information obtained from NDT. The proposed models can be used when the flexural stiffness decays nonuniformly over a column height. The flexural stiffness of a column is estimated based on measured acceleration responses using a system identification method and the damage index method. As an application of the proposed models, a case study assesses the fragility (the conditional probability of attaining or exceeding a specified capacity level) of the column in the Lavic Road Overcrossing for a given deformation or shear demand. This two-span concrete box-girder bridge located in Southern California was subject to the Hector Mine Earthquake in 1999. Pre- and postearthquake estimates of the univariate shear and deformation fragilities and of the bivariate shear-deformation fragility are computed and compared. Both displacement and shear capacities are found to decrease after the earthquake event. Additionally, the results show that the damage due to the Hector Mine Earthquake has a larger impact on the shear capacity than the deformation capacity, leading to a more significant increment in the shear fragility than in the deformation fragility. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Probabilistic seismic demand models and fragility estimates for reinforced concrete highway bridges with one single-column bent / Qindan Huang in Journal of engineering mechanics, Vol. 136 N° 11 (Novembre 2010)
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[article]
inJournal of engineering mechanics > Vol. 136 N° 11 (Novembre 2010) . - pp.1340-1353
Titre : Probabilistic seismic demand models and fragility estimates for reinforced concrete highway bridges with one single-column bent Type de document : texte imprimé Auteurs : Qindan Huang, Auteur ; Paolo Gardoni, Auteur ; Stefan Hurlebaus, Auteur Année de publication : 2011 Article en page(s) : pp.1340-1353 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Bayesian analysis Reinforced concrete Bridges highway Probability Deformation Shear failures Seismic Experimentation. Résumé : In performance-based seismic design, general and practical seismic demand models of structures are essential. This paper proposes a general methodology to construct probabilistic demand models for reinforced concrete (RC) highway bridges with one single-column bent. The developed probabilistic models consider the dependence of the seismic demands on the ground motion characteristics and the prevailing uncertainties, including uncertainties in the structural properties, statistical uncertainties, and model errors. Probabilistic models for seismic deformation, shear, and bivariate deformation-shear demands are developed by adding correction terms to deterministic demand models currently used in practice. The correction terms remove the bias and improve the accuracy of the deterministic models, complement the deterministic models with ground motion intensity measures that are critical for determining the seismic demands, and preserve the simplicity of the deterministic models to facilitate the practical application of the proposed probabilistic models. The demand data used for developing the models are obtained from 60 representative configurations of finite-element models of RC bridges with one single-column bent subjected to a large number of representative seismic ground motions. The ground motions include near-field and ordinary records, and the soil amplification due to different soil characteristics is considered. A Bayesian updating approach and an all possible subset model selection are used to assess the unknown model parameters and select the correction terms. Combined with previously developed capacity models, the proposed seismic demand models can be used to estimate the seismic fragility of RC bridges with one single-column bent. Seismic fragility is defined as the conditional probability that the demand quantity of interest attains or exceeds a specified capacity level for given values of the earthquake intensity measures. As an application, the univariate deformation and shear fragilities and the bivariate deformation-shear fragility are assessed for an example bridge. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v136/i11/p1340_s1?isAuthorized=no [article] Probabilistic seismic demand models and fragility estimates for reinforced concrete highway bridges with one single-column bent [texte imprimé] / Qindan Huang, Auteur ; Paolo Gardoni, Auteur ; Stefan Hurlebaus, Auteur . - 2011 . - pp.1340-1353.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 136 N° 11 (Novembre 2010) . - pp.1340-1353
Mots-clés : Bayesian analysis Reinforced concrete Bridges highway Probability Deformation Shear failures Seismic Experimentation. Résumé : In performance-based seismic design, general and practical seismic demand models of structures are essential. This paper proposes a general methodology to construct probabilistic demand models for reinforced concrete (RC) highway bridges with one single-column bent. The developed probabilistic models consider the dependence of the seismic demands on the ground motion characteristics and the prevailing uncertainties, including uncertainties in the structural properties, statistical uncertainties, and model errors. Probabilistic models for seismic deformation, shear, and bivariate deformation-shear demands are developed by adding correction terms to deterministic demand models currently used in practice. The correction terms remove the bias and improve the accuracy of the deterministic models, complement the deterministic models with ground motion intensity measures that are critical for determining the seismic demands, and preserve the simplicity of the deterministic models to facilitate the practical application of the proposed probabilistic models. The demand data used for developing the models are obtained from 60 representative configurations of finite-element models of RC bridges with one single-column bent subjected to a large number of representative seismic ground motions. The ground motions include near-field and ordinary records, and the soil amplification due to different soil characteristics is considered. A Bayesian updating approach and an all possible subset model selection are used to assess the unknown model parameters and select the correction terms. Combined with previously developed capacity models, the proposed seismic demand models can be used to estimate the seismic fragility of RC bridges with one single-column bent. Seismic fragility is defined as the conditional probability that the demand quantity of interest attains or exceeds a specified capacity level for given values of the earthquake intensity measures. As an application, the univariate deformation and shear fragilities and the bivariate deformation-shear fragility are assessed for an example bridge. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v136/i11/p1340_s1?isAuthorized=no Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Tension stiffening in prestressed concrete beams using moment-curvature relationship / Shobeir Pirayeh Gar in Journal of structural engineering, Vol. 138 N° 8 (Août 2012)
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[article]
inJournal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.1075–1078.
Titre : Tension stiffening in prestressed concrete beams using moment-curvature relationship Type de document : texte imprimé Auteurs : Shobeir Pirayeh Gar, Auteur ; Stefan Hurlebaus, Auteur Année de publication : 2012 Article en page(s) : pp.1075–1078. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Tension stiffening Moment-curvature Prestressing Cracking Serviceability Concrete beams Résumé : Tension stiffening phenomenon plays a vital role in serviceability of nonprestressed reinforced concrete (RC) beams as it enhances the postcracking flexural stiffness leading to a smaller deflection, accordingly. However, this paper’s findings indicate that in contrast to RC sections, the effect of tension stiffening is negligible for fully prestressed concrete sections. This study presents a closed form equation of moment-curvature for prestressed concrete sections under service load, where the tensile strength of the concrete is taken into account. This equation is verified by experimental test data and numerical analysis, thereby proving the negligible effect of tension stiffening on fully prestressed concrete sections. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000534 [article] Tension stiffening in prestressed concrete beams using moment-curvature relationship [texte imprimé] / Shobeir Pirayeh Gar, Auteur ; Stefan Hurlebaus, Auteur . - 2012 . - pp.1075–1078.
Génie civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.1075–1078.
Mots-clés : Tension stiffening Moment-curvature Prestressing Cracking Serviceability Concrete beams Résumé : Tension stiffening phenomenon plays a vital role in serviceability of nonprestressed reinforced concrete (RC) beams as it enhances the postcracking flexural stiffness leading to a smaller deflection, accordingly. However, this paper’s findings indicate that in contrast to RC sections, the effect of tension stiffening is negligible for fully prestressed concrete sections. This study presents a closed form equation of moment-curvature for prestressed concrete sections under service load, where the tensile strength of the concrete is taken into account. This equation is verified by experimental test data and numerical analysis, thereby proving the negligible effect of tension stiffening on fully prestressed concrete sections. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000534 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire