Documents disponibles écrits par cet auteur

Approximate reliability-based optimization using a three-step approach based on subset simulation / Jianye Ching in Journal of engineering mechanics, Vol. 133 N°4 (Avril 2007) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.481–493. Titre : Approximate reliability-based optimization using a three-step approach based on subset simulation Type de document : texte imprimé Auteurs : Jianye Ching, Auteur ; Yi-Hung Hsieh, Auteur Année de publication : 2007 Article en page(s) : pp.481–493. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Optimization  Simulation  Stochastic  processes  Reliability Résumé : A novel three-step approach is proposed to solve reliability-based optimization (RBO) problems. The new approach is based on a novel approach previously developed by the authors for estimating failure probability functions. The major advantage of the new approach is that it is applicable to RBO problems with high-dimensional uncertainties and with arbitrary system complexities. The basic idea is to transform the reliability constraint in the target RBO problem into nonprobabilistic one by first estimating the failure probability function and the confidence intervals using minimal amount of computation, in fact, using just a single subset simulation (SubSim) run for each reliability constraint. Samples of the failure probability function are then drawn from the confidence intervals. In the second step, candidate solutions of the RBO problems are found based on the samples, and in the third step, the final design solution is screened out of the candidates to ensure that the failure probability of the final design meets the target, which also only costs a single SubSim run. Four numerical examples are investigated to verify the proposed novel approach. The results show that the approach is capable of finding approximate solutions that are usually close to the actual solution of the target RBO problem. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A4%2848 [...] [article] Approximate reliability-based optimization using a three-step approach based on subset simulation [texte imprimé] / Jianye Ching, Auteur ; Yi-Hung Hsieh, Auteur . - 2007 . - pp.481–493. Applied mechanics Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.481–493. Mots-clés : Optimization  Simulation  Stochastic  processes  Reliability Résumé : A novel three-step approach is proposed to solve reliability-based optimization (RBO) problems. The new approach is based on a novel approach previously developed by the authors for estimating failure probability functions. The major advantage of the new approach is that it is applicable to RBO problems with high-dimensional uncertainties and with arbitrary system complexities. The basic idea is to transform the reliability constraint in the target RBO problem into nonprobabilistic one by first estimating the failure probability function and the confidence intervals using minimal amount of computation, in fact, using just a single subset simulation (SubSim) run for each reliability constraint. Samples of the failure probability function are then drawn from the confidence intervals. In the second step, candidate solutions of the RBO problems are found based on the samples, and in the third step, the final design solution is screened out of the candidates to ensure that the failure probability of the final design meets the target, which also only costs a single SubSim run. Four numerical examples are investigated to verify the proposed novel approach. The results show that the approach is capable of finding approximate solutions that are usually close to the actual solution of the target RBO problem. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A4%2848 [...]

Calibration of reliability-based resistance factors for flush drilled soil anchors in Taipei basin / Jianye Ching in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°9 (Septembre 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°9 (Septembre 2008) . - pp. 1348-1363 Titre : Calibration of reliability-based resistance factors for flush drilled soil anchors in Taipei basin Type de document : texte imprimé Auteurs : Jianye Ching, Auteur ; Hung-Jiun Liao, Auteur ; Chia-Wei Sue, Auteur Année de publication : 2008 Article en page(s) : pp. 1348-1363 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Anchors  Pull-out  resistance  Safety  factors  Taiwan  Calibration  Drilling Résumé : The goal of this research is to calibrate the reliability-based resistance factor of flush drilled soil anchors for their ultimate pullout capacities based on in situ anchor pullout test data in the alluvial soil underlying the Taipei Basin. Efforts are taken to quantify the uncertainties with a full probabilistic analysis approach. The resistance factor is calibrated based on the in situ test results of 46 anchors with a rigorous theoretical approach which constructs the relationship between the resistance factor and failure probability. With this relationship, the reliability corresponding to the code regulation can be verified. From the results of the analysis, it is found that the borehole enlargement due to the flush drilling is quite significant: the actual diameter of the fixed anchor end may be much larger than the nominal diameter of the drilling casing. Consequently, the safety factor of 3.0, recommended by most anchor codes, is found to be too conservative. The results should be valuable for reliability-based design of flush drilled soil anchors in the Taipei Basin. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A9%2813 [...] [article] Calibration of reliability-based resistance factors for flush drilled soil anchors in Taipei basin [texte imprimé] / Jianye Ching, Auteur ; Hung-Jiun Liao, Auteur ; Chia-Wei Sue, Auteur . - 2008 . - pp. 1348-1363. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°9 (Septembre 2008) . - pp. 1348-1363 Mots-clés : Anchors  Pull-out  resistance  Safety  factors  Taiwan  Calibration  Drilling Résumé : The goal of this research is to calibrate the reliability-based resistance factor of flush drilled soil anchors for their ultimate pullout capacities based on in situ anchor pullout test data in the alluvial soil underlying the Taipei Basin. Efforts are taken to quantify the uncertainties with a full probabilistic analysis approach. The resistance factor is calibrated based on the in situ test results of 46 anchors with a rigorous theoretical approach which constructs the relationship between the resistance factor and failure probability. With this relationship, the reliability corresponding to the code regulation can be verified. From the results of the analysis, it is found that the borehole enlargement due to the flush drilling is quite significant: the actual diameter of the fixed anchor end may be much larger than the nominal diameter of the drilling casing. Consequently, the safety factor of 3.0, recommended by most anchor codes, is found to be too conservative. The results should be valuable for reliability-based design of flush drilled soil anchors in the Taipei Basin. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A9%2813 [...]

Efficient evaluation of reliability for slopes with circular slip surfaces using importance sampling / Jianye Ching in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 6 (Juin 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 768–777 Titre : Efficient evaluation of reliability for slopes with circular slip surfaces using importance sampling Type de document : texte imprimé Auteurs : Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur Année de publication : 2009 Article en page(s) : pp. 768–777 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Slope  stability  Monte  Carlo  method  System  reliability  Sampling Résumé : Evaluating the reliability of a slope is a challenging task because the possible slip surface is not known beforehand. Approximate methods via the first-order reliability method provide efficient ways of evaluating failure probability of the “most probable” failure surface. The tradeoff is that the failure probability estimates may be biased towards the unconservative side. The Monte Carlo simulation (MCS) is a viable unbiased way of estimating the failure probability of a slope, but MCS is inefficient for problems with small failure probabilities. This study proposes a novel way based on the importance sampling technique of estimating slope reliability that is unbiased and yet is much more efficient than MCS. In particular, the critical issue of the specification of the importance sampling probability density function will be addressed in detail. Three examples of slope reliability will be used to demonstrate the performance of the new method. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000035 [article] Efficient evaluation of reliability for slopes with circular slip surfaces using importance sampling [texte imprimé] / Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur . - 2009 . - pp. 768–777. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 768–777 Mots-clés : Slope  stability  Monte  Carlo  method  System  reliability  Sampling Résumé : Evaluating the reliability of a slope is a challenging task because the possible slip surface is not known beforehand. Approximate methods via the first-order reliability method provide efficient ways of evaluating failure probability of the “most probable” failure surface. The tradeoff is that the failure probability estimates may be biased towards the unconservative side. The Monte Carlo simulation (MCS) is a viable unbiased way of estimating the failure probability of a slope, but MCS is inefficient for problems with small failure probabilities. This study proposes a novel way based on the importance sampling technique of estimating slope reliability that is unbiased and yet is much more efficient than MCS. In particular, the critical issue of the specification of the importance sampling probability density function will be addressed in detail. Three examples of slope reliability will be used to demonstrate the performance of the new method. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000035

Observations on limit equilibrium–based slope reliability problems with inclined weak seams / Jianye Ching in Journal of engineering mechanics, Vol. 136 N° 10 (Octobre 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 10 (Octobre 2010) . - pp.1220-1233 Titre : Observations on limit equilibrium–based slope reliability problems with inclined weak seams Type de document : texte imprimé Auteurs : Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur Année de publication : 2010 Article en page(s) : pp.1220-1233 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Slope  stability  Monte  Carlo  method  Reliability  Sampling  Limit  equilibrium. Résumé : This study addresses the complexity of slope reliability problems based on limit equilibrium methods (LEMs). The main focus is on the existence of multiple failure modes that poses difficulty to many LEM-based slope reliability methods. In particular, when weak seams are present, the failure modes associated with those seams may be difficult to detect. A systematic way of searching the failure modes is proposed, and its robustness over slopes with or without weak seams is demonstrated. It is found that in the presence of weak seams, assuming circular slip surfaces may cause underestimation of slope failure probability. The conclusion of the study promotes the use of finite elements as the stability method for reliability evaluation because it is not necessary to search for failure surfaces in finite-element stability analysis. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v136/i10/p1220_s1?isAuthorized=no [article] Observations on limit equilibrium–based slope reliability problems with inclined weak seams [texte imprimé] / Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur . - 2010 . - pp.1220-1233. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 10 (Octobre 2010) . - pp.1220-1233 Mots-clés : Slope  stability  Monte  Carlo  method  Reliability  Sampling  Limit  equilibrium. Résumé : This study addresses the complexity of slope reliability problems based on limit equilibrium methods (LEMs). The main focus is on the existence of multiple failure modes that poses difficulty to many LEM-based slope reliability methods. In particular, when weak seams are present, the failure modes associated with those seams may be difficult to detect. A systematic way of searching the failure modes is proposed, and its robustness over slopes with or without weak seams is demonstrated. It is found that in the presence of weak seams, assuming circular slip surfaces may cause underestimation of slope failure probability. The conclusion of the study promotes the use of finite elements as the stability method for reliability evaluation because it is not necessary to search for failure surfaces in finite-element stability analysis. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v136/i10/p1220_s1?isAuthorized=no

Reliability-based design for basal heave stability of deep / Shih-Hsuan Wu in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 594–603 Titre : Reliability-based design for basal heave stability of deep : Excavations in spatially varying soils Type de document : texte imprimé Auteurs : Shih-Hsuan Wu, Auteur ; Chang-Yu Ou, Auteur ; Jianye Ching, Auteur Année de publication : 2012 Article en page(s) : pp. 594–603 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Reliability-based  design  Spatial  variability  Basal  heave  Deep  excavation Résumé : Spatial variability of soil undrained shear strength is usually not rigorously considered in the design of basal heave for deep excavations. In this study, the slip circle method is employed to investigate how the required safety-factor against basal heave was affected by spatial variability in the context of reliability-based design. The nonstationary random field model is adopted to model spatial variability of undrained shear strength. Results show that the required safety-factor obtained with the consideration of spatial variability is much smaller than that without the consideration. Parametric studies show that the vertical scale of fluctuation has a significant influence on the required safety-factor: the longer the scale of fluctuation, the larger the required safety-factor. For target failure probabilities of 0.01 and 0.001, the corresponding required safety factors are in the ranges of 1.4–1.9 and 1.6–2.4, respectively, for the average value of vertical scale of fluctuation of 2.5 m. Design charts are provided for the ease of implementation, and an example of reliability-based design for basal stability is given for demonstration. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000626 [article] Reliability-based design for basal heave stability of deep : Excavations in spatially varying soils [texte imprimé] / Shih-Hsuan Wu, Auteur ; Chang-Yu Ou, Auteur ; Jianye Ching, Auteur . - 2012 . - pp. 594–603. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 594–603 Mots-clés : Reliability-based  design  Spatial  variability  Basal  heave  Deep  excavation Résumé : Spatial variability of soil undrained shear strength is usually not rigorously considered in the design of basal heave for deep excavations. In this study, the slip circle method is employed to investigate how the required safety-factor against basal heave was affected by spatial variability in the context of reliability-based design. The nonstationary random field model is adopted to model spatial variability of undrained shear strength. Results show that the required safety-factor obtained with the consideration of spatial variability is much smaller than that without the consideration. Parametric studies show that the vertical scale of fluctuation has a significant influence on the required safety-factor: the longer the scale of fluctuation, the larger the required safety-factor. For target failure probabilities of 0.01 and 0.001, the corresponding required safety factors are in the ranges of 1.4–1.9 and 1.6–2.4, respectively, for the average value of vertical scale of fluctuation of 2.5 m. Design charts are provided for the ease of implementation, and an example of reliability-based design for basal stability is given for demonstration. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000626

Reliability-based design for external stability of narrow mechanically stabilized earth walls / Kuo-Hsin Yang in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 3 (Mars 2011) 

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Transitional markov chain monte carlo method for bayesian model updating, model class selection, and model averaging / Jianye Ching in Journal of engineering mechanics, Vol. 133 N°7 (Juillet 2007) 

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Updating uncertainties in friction angles of clean sands / Jianye Ching in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 2 (Fevrier 2012) 

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