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Bayesian updating of soil parameters for braced excavations using field observations / C. Hsein Juang in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 3 (Mars 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 395-406 Titre : Bayesian updating of soil parameters for braced excavations using field observations Type de document : texte imprimé Auteurs : C. Hsein Juang, Auteur ; Zhe Luo, Auteur ; Sez Atamturktur, Auteur Année de publication : 2013 Article en page(s) : pp. 395-406 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : Bayesian  analysis;  Markov  process;  Monte  Carlo  method;  simulation;  algorithms;  excavation;  walls;  deflection;  bracing Résumé : A Bayesian framework using field observations for back-analysis and updating of soil parameters in a multistage braced excavation is presented. Because of the uncertainties originating from the poorly known soil parameters, the imperfect analysis model, and other factors such as construction variability, the soil parameters can only be inferred as probability distributions. In this paper, these posterior distributions are derived using the Markov chain Monte Carlo (MCMC) sampling method implemented with the Metropolis-Hastings algorithm. In the proposed framework, Bayesian updating is first realized with one type of response observation (maximum wall deflection or maximum settlement), and then this Bayesian framework is extended to allow for simultaneous use of two types of response observations in the updating. The proposed framework is illustrated with a quality excavation case and shown effective regardless of the prior knowledge of soil parameters and type of response observations adopted. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000782 [article] Bayesian updating of soil parameters for braced excavations using field observations [texte imprimé] / C. Hsein Juang, Auteur ; Zhe Luo, Auteur ; Sez Atamturktur, Auteur . - 2013 . - pp. 395-406. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 395-406 Mots-clés : Bayesian  analysis;  Markov  process;  Monte  Carlo  method;  simulation;  algorithms;  excavation;  walls;  deflection;  bracing Résumé : A Bayesian framework using field observations for back-analysis and updating of soil parameters in a multistage braced excavation is presented. Because of the uncertainties originating from the poorly known soil parameters, the imperfect analysis model, and other factors such as construction variability, the soil parameters can only be inferred as probability distributions. In this paper, these posterior distributions are derived using the Markov chain Monte Carlo (MCMC) sampling method implemented with the Metropolis-Hastings algorithm. In the proposed framework, Bayesian updating is first realized with one type of response observation (maximum wall deflection or maximum settlement), and then this Bayesian framework is extended to allow for simultaneous use of two types of response observations in the updating. The proposed framework is illustrated with a quality excavation case and shown effective regardless of the prior knowledge of soil parameters and type of response observations adopted. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000782

Bootstrapping for characterizing the effect of uncertainty in sample statistics for braced excavations / Zhe Luo in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 1 (Janvier 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 13–23 Titre : Bootstrapping for characterizing the effect of uncertainty in sample statistics for braced excavations Type de document : texte imprimé Auteurs : Zhe Luo, Auteur ; Sez Atamturktur, Auteur ; C. Hsein Juang, Auteur Année de publication : 2013 Article en page(s) : pp. 13–23 Note générale : geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : excavation;  bracing;  serviceability;  probability  distribution;  parameters;  uncertainty  principles;  statistics Résumé : A simple procedure for assessing the probability of serviceability failure in a braced excavation involving bootstrapping to characterize the effect of uncertainty in sample statistics is presented. Here, the failure is defined when an excavation system’s response in terms of the maximum wall deflection or ground settlement that exceeds the limiting value specified by the client or in an applicable code. The analysis for the probability of failure (or probability of exceedance) necessitates an evaluation of the means and SDs of critical soil parameters. In geotechnical practice, these means and SDs are often estimated from a very limited data set, which can lead to uncertainty in the derived sample statistics. Thus, in this study bootstrapping is used to characterize the uncertainty or variation of sample statistics and its effect on the failure probability. Through the bootstrapping analysis, the probability of exceedance can be presented as a confidence interval instead of a single, fixed probability. The information gained should enable the engineer to make a more rational assessment of the risk of serviceability failure in a braced excavation. The study points to the potential of the bootstrap method in coping with the problem of having to evaluate failure probability with uncertain sample statistics. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000734 [article] Bootstrapping for characterizing the effect of uncertainty in sample statistics for braced excavations [texte imprimé] / Zhe Luo, Auteur ; Sez Atamturktur, Auteur ; C. Hsein Juang, Auteur . - 2013 . - pp. 13–23. geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 13–23 Mots-clés : excavation;  bracing;  serviceability;  probability  distribution;  parameters;  uncertainty  principles;  statistics Résumé : A simple procedure for assessing the probability of serviceability failure in a braced excavation involving bootstrapping to characterize the effect of uncertainty in sample statistics is presented. Here, the failure is defined when an excavation system’s response in terms of the maximum wall deflection or ground settlement that exceeds the limiting value specified by the client or in an applicable code. The analysis for the probability of failure (or probability of exceedance) necessitates an evaluation of the means and SDs of critical soil parameters. In geotechnical practice, these means and SDs are often estimated from a very limited data set, which can lead to uncertainty in the derived sample statistics. Thus, in this study bootstrapping is used to characterize the uncertainty or variation of sample statistics and its effect on the failure probability. Through the bootstrapping analysis, the probability of exceedance can be presented as a confidence interval instead of a single, fixed probability. The information gained should enable the engineer to make a more rational assessment of the risk of serviceability failure in a braced excavation. The study points to the potential of the bootstrap method in coping with the problem of having to evaluate failure probability with uncertain sample statistics. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000734

Fully probabilistic framework for evaluating excavation-induced damage potential of adjacent buildings / C. Hsein Juang in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 2 (Fevrier 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 2 (Fevrier 2011) . - pp. 130-139 Titre : Fully probabilistic framework for evaluating excavation-induced damage potential of adjacent buildings Type de document : texte imprimé Auteurs : C. Hsein Juang, Auteur ; Matt Schuster, Auteur ; Chang-Yu Ou, Auteur Année de publication : 2011 Article en page(s) : pp. 130-139 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Reliability  Braced  excavation  Ground  settlement  Wall  deflection  Building  damage Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents a framework for a fully probabilistic analysis of the potential for damage to buildings adjacent to an excavation. Herein, the damage potential index (DPI), which is a function of angular distortion and lateral strain, is used to assess building damage potential. A serviceability limit state is established in which the resistance is expressed in terms of the “limiting” DPI, and the load is represented by the “applied” DPI. In this context, damage to the building adjacent to an excavation is said to occur deterministically if the applied DPI is greater than the limiting DPI. For the fully probabilistic analysis, both parameter and model uncertainties of the limiting and applied DPIs are first characterized. The analysis framework is then presented and demonstrated with a case history. Finally, sensitivity analysis is performed to identify the factors to which the probability of damage is most sensitive and to analyze the effect of various assumptions of the input parameters on the computed probability of building damage. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i2/p130_s1?isAuthorized=no [article] Fully probabilistic framework for evaluating excavation-induced damage potential of adjacent buildings [texte imprimé] / C. Hsein Juang, Auteur ; Matt Schuster, Auteur ; Chang-Yu Ou, Auteur . - 2011 . - pp. 130-139. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 2 (Fevrier 2011) . - pp. 130-139 Mots-clés : Reliability  Braced  excavation  Ground  settlement  Wall  deflection  Building  damage Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents a framework for a fully probabilistic analysis of the potential for damage to buildings adjacent to an excavation. Herein, the damage potential index (DPI), which is a function of angular distortion and lateral strain, is used to assess building damage potential. A serviceability limit state is established in which the resistance is expressed in terms of the “limiting” DPI, and the load is represented by the “applied” DPI. In this context, damage to the building adjacent to an excavation is said to occur deterministically if the applied DPI is greater than the limiting DPI. For the fully probabilistic analysis, both parameter and model uncertainties of the limiting and applied DPIs are first characterized. The analysis framework is then presented and demonstrated with a case history. Finally, sensitivity analysis is performed to identify the factors to which the probability of damage is most sensitive and to analyze the effect of various assumptions of the input parameters on the computed probability of building damage. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i2/p130_s1?isAuthorized=no

Model uncertainty in normalized shear modulus and damping relationships / Zhang, Jianfeng in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°1 (Janvier 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 24–36 Titre : Model uncertainty in normalized shear modulus and damping relationships Type de document : texte imprimé Auteurs : Zhang, Jianfeng, Auteur ; Ronald D. Andrus, Auteur ; C. Hsein Juang, Auteur Année de publication : 2008 Article en page(s) : pp. 24–36 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Damping  Dynamic  properties  Ground  motion  Seismic  analysis  Shear  modulus  Uncertainty  principles Résumé : Model uncertainty associated with normalized shear modulus and material damping ratio relationships developed in a previous study is discussed in terms of standard deviations in this paper. The relationships were originally developed by separating resonant column and torsional shear test results of 122 specimens into three general geologic groups (Quaternary-age soils, Tertiary-age and older soils, and residual/saprolite soils) and determining mean regressional model parameters (i.e., α , k , γr1 , and Dmin1 ) for each group. Statistical variability of the regressional parameters is quantified and expressed by standard errors of prediction. The determined uncertainty of the regressional parameters is then propagated through the recommended relationships using the point-estimate method to estimate the model uncertainty of the relationships. The point-estimate method is a simple and effective method of uncertainty propagation. For uncertainty estimation, the regressional parameters are assumed to be uncorrelated for the sake of simplicity. The influence of this assumption on the model uncertainty of normalized shear modulus and material damping ratio values, as well as the sensitivity of the model uncertainty to the uncertainty of various regressional parameters, are also discussed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2824 [...] [article] Model uncertainty in normalized shear modulus and damping relationships [texte imprimé] / Zhang, Jianfeng, Auteur ; Ronald D. Andrus, Auteur ; C. Hsein Juang, Auteur . - 2008 . - pp. 24–36. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 24–36 Mots-clés : Damping  Dynamic  properties  Ground  motion  Seismic  analysis  Shear  modulus  Uncertainty  principles Résumé : Model uncertainty associated with normalized shear modulus and material damping ratio relationships developed in a previous study is discussed in terms of standard deviations in this paper. The relationships were originally developed by separating resonant column and torsional shear test results of 122 specimens into three general geologic groups (Quaternary-age soils, Tertiary-age and older soils, and residual/saprolite soils) and determining mean regressional model parameters (i.e., α , k , γr1 , and Dmin1 ) for each group. Statistical variability of the regressional parameters is quantified and expressed by standard errors of prediction. The determined uncertainty of the regressional parameters is then propagated through the recommended relationships using the point-estimate method to estimate the model uncertainty of the relationships. The point-estimate method is a simple and effective method of uncertainty propagation. For uncertainty estimation, the regressional parameters are assumed to be uncorrelated for the sake of simplicity. The influence of this assumption on the model uncertainty of normalized shear modulus and material damping ratio values, as well as the sensitivity of the model uncertainty to the uncertainty of various regressional parameters, are also discussed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2824 [...]

Reliability analysis and updating of excavation-induced ground settlement for building serviceability assessment / Evan C. Hsiao in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°10 (Octobre 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°10 (Octobre 2008) . - pp. 1448–1458 Titre : Reliability analysis and updating of excavation-induced ground settlement for building serviceability assessment Type de document : texte imprimé Auteurs : Evan C. Hsiao, Auteur ; Matt Schuster, Auteur ; C. Hsein Juang, Auteur Année de publication : 2008 Article en page(s) : pp. 1448–1458 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Reliability  Probability  Bayesian  analysis  Excavation  Settlement  Serviceability  Damage Résumé : In this paper, the excavation-induced settlement determined by the KJHH model, a recently developed semiempirical model, is used to assess the serviceability reliability of adjacent buildings. The calculated settlement, considered as the load in the context of reliability analyses in this paper, is compared with a tolerable settlement, considered as the resistance herein. The reliability of the adjacent building against “damage” (defined herein as the violation of serviceability requirements such as having intolerable settlement) is first analyzed and the probability of exceedance (i.e., exceeding the tolerable settlement) is calculated. Furthermore, as the excavation proceeds, observed settlement at the current excavation stage is used to update the prediction of settlement at subsequent stages, and the probability of exceedance is updated accordingly. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A10%281 [...] [article] Reliability analysis and updating of excavation-induced ground settlement for building serviceability assessment [texte imprimé] / Evan C. Hsiao, Auteur ; Matt Schuster, Auteur ; C. Hsein Juang, Auteur . - 2008 . - pp. 1448–1458. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°10 (Octobre 2008) . - pp. 1448–1458 Mots-clés : Reliability  Probability  Bayesian  analysis  Excavation  Settlement  Serviceability  Damage Résumé : In this paper, the excavation-induced settlement determined by the KJHH model, a recently developed semiempirical model, is used to assess the serviceability reliability of adjacent buildings. The calculated settlement, considered as the load in the context of reliability analyses in this paper, is compared with a tolerable settlement, considered as the resistance herein. The reliability of the adjacent building against “damage” (defined herein as the violation of serviceability requirements such as having intolerable settlement) is first analyzed and the probability of exceedance (i.e., exceeding the tolerable settlement) is calculated. Furthermore, as the excavation proceeds, observed settlement at the current excavation stage is used to update the prediction of settlement at subsequent stages, and the probability of exceedance is updated accordingly. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A10%281 [...]

Reliability analysis of rock wedge stability / Ya-Fen Lee in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 6 (Juin 2012) 

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Simplified model for evaluating damage potential of buildings adjacent to a braced excavation / Matt Schuster in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 12 (Décembre 2009) 

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Simplified procedure for developing joint distribution of amax and Mw for probabilistic liquefaction hazard analysis / C. Hsein Juang in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°8 (Août 2008) 

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