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Raymond B Seed - One of the best experts on this subject based on the ideXlab platform.
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examination of differences between three spt based seismic Soil Liquefaction triggering relationships
Soil Dynamics and Earthquake Engineering, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract The preceding companion paper presented the updating of the seismic Soil Liquefaction triggering relationship of Cetin et al. [1], and compared the resulting updated relationship with the earlier version. In this second paper, a detailed cross-comparison is made between three triggering relationships: (1) Seed et al. [2], as slightly updated by the NCEER Working Group (Youd et al. [3]), (2) Boulanger and Idriss [4], and (3) Cetin et al. [5]. Differences between these three triggering relationships, and the apparent causes of them are examined. Also studied are the impacts of these differences on levels of conservatism with regard to evaluation of Liquefaction triggering hazard, and the resulting risks for engineering projects.
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dataset on spt based seismic Soil Liquefaction
Data in Brief, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:This data article provides a summary of seismic Soil Liquefaction triggering and non-triggering case histories, which were compiled, screened for data completeness and quality, and then processed for the development of triggering relationships proposed in "SPT-based probabilistic and deterministic assessment of seismic Soil Liquefaction triggering hazard" [1]. The database is composed of 113 Liquefaction, 95 non-Liquefaction, and 2 marginal Liquefaction case histories, from seismic events with moment magnitude Mw values varying in the range of 5.9 to 8.3. A spreadsheet summary of these case histories are included along with a separate spreadsheet, by which maximum likelihood assessment was performed. These data transparently enable researchers to access case history input parameters and processing details, and to compare the case history processing protocols with the ones of different researchers (e.g.: "The influence of SPT procedures in Soil Liquefaction resistance evaluations." [2], "SPT-based Liquefaction triggering procedures." [3]).
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the use of the spt based seismic Soil Liquefaction triggering evaluation methodology in engineering hazard assessments
MethodsX, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract Probabilistic and deterministic seismic Soil Liquefaction triggering methodologies are proposed in Cetin et al. [1]. This manuscript: i) presents the protocols, which need to be followed for the correct use of this methodology for forward engineering (design) assessments, ii) guides the engineers through the procedure, and iii) discusses the “tricks” alongside the protocol. An illustrative Soil profile shaken by a scenario earthquake is presented, through which consistent estimations of representative SPT blow-counts along with fines content are discussed. Additionally, the estimation of CSR input parameters are illustrated. Last but not least the uncertainty estimations of these input parameters are presented along with the probability and factory of safety for the assessment of Liquefaction triggering. • A simplified methodology and its use to assess Liquefaction triggering hazard of a Soil site under an earthquake scenario event. • The consistent and unbiased mean estimates of input parameters of SPT blow-counts( N 1,60 ), fines content ( F C ), vertical effective ( s ' v ) and total ( s v ) stresses, maximum ground acceleration ( a m a x ), stress reduction (or non-linear shear mass participation) factor ( r d ) and moment magnitude ( M w ) along with their uncertainties are discussed. • Outlined methodology enables engineers to estimate the probability of- and factor of safety against- seismic Soil Liquefaction triggering for design problems.
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shear wave velocity based probabilistic and deterministic assessment of seismic Soil Liquefaction potential
Journal of Geotechnical and Geoenvironmental Engineering, 2013Co-Authors: Robert E Kayen, Robb E S Moss, Raymond B Seed, Eric M Thompson, K O Cetin, Der A Kiureghian, Yoshiaki Tanaka, Kohji TokimatsuAbstract:AbstractShear-wave velocity (Vs) offers a means to determine the seismic resistance of Soil to Liquefaction by a fundamental Soil property. This paper presents the results of an 11-year international project to gather new Vs site data and develop probabilistic correlations for seismic Soil Liquefaction occurrence. Toward that objective, shear-wave velocity test sites were identified, and measurements made for 301 new Liquefaction field case histories in China, Japan, Taiwan, Greece, and the United States over a decade. The majority of these new case histories reoccupy those previously investigated by penetration testing. These new data are combined with previously published case histories to build a global catalog of 422 case histories of Vs Liquefaction performance. Bayesian regression and structural reliability methods facilitate a probabilistic treatment of the Vs catalog for performance-based engineering applications. Where possible, uncertainties of the variables comprising both the seismic demand an...
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cpt based probabilistic and deterministic assessment of in situ seismic Soil Liquefaction potential
Journal of Geotechnical and Geoenvironmental Engineering, 2006Co-Authors: Robb E S Moss, Raymond B Seed, Robert E Kayen, Der A Kiureghian, Jonathan P Stewart, K O CetinAbstract:This paper presents a complete methodology for both probabilistic and deterministic assessment of seismic Soil Liquefaction triggering potential based on the cone penetration test (CPT). A comprehensive worldwide set of CPT-based Liquefaction field case histories were compiled and back analyzed, and the data then used to develop probabilistic triggering correlations. Issues investigated in this study include improved normalization of CPT resistance measurements for the influence of effective overburden stress, and adjustment to CPT tip resistance for the potential influence of "thin" liquefiable layers. The effects of Soil type and Soil character (i.e., "fines" adjustment) for the new correlations are based on a combination of CPT tip and sleeve resistance. To quantify probability for performance-based engineering applications, Bayesian "regression" methods were used, and the uncertainties of all variables comprising both the seismic demand and the Liquefaction resistance were estimated and included in the analysis. The resulting correlations were developed using a Bayesian framework and are presented in both probabilistic and deterministic formats. The results are compared to previous probabilistic and deterministic correlations.
Khaled Chowdhury - One of the best experts on this subject based on the ideXlab platform.
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examination of differences between three spt based seismic Soil Liquefaction triggering relationships
Soil Dynamics and Earthquake Engineering, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract The preceding companion paper presented the updating of the seismic Soil Liquefaction triggering relationship of Cetin et al. [1], and compared the resulting updated relationship with the earlier version. In this second paper, a detailed cross-comparison is made between three triggering relationships: (1) Seed et al. [2], as slightly updated by the NCEER Working Group (Youd et al. [3]), (2) Boulanger and Idriss [4], and (3) Cetin et al. [5]. Differences between these three triggering relationships, and the apparent causes of them are examined. Also studied are the impacts of these differences on levels of conservatism with regard to evaluation of Liquefaction triggering hazard, and the resulting risks for engineering projects.
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dataset on spt based seismic Soil Liquefaction
Data in Brief, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:This data article provides a summary of seismic Soil Liquefaction triggering and non-triggering case histories, which were compiled, screened for data completeness and quality, and then processed for the development of triggering relationships proposed in "SPT-based probabilistic and deterministic assessment of seismic Soil Liquefaction triggering hazard" [1]. The database is composed of 113 Liquefaction, 95 non-Liquefaction, and 2 marginal Liquefaction case histories, from seismic events with moment magnitude Mw values varying in the range of 5.9 to 8.3. A spreadsheet summary of these case histories are included along with a separate spreadsheet, by which maximum likelihood assessment was performed. These data transparently enable researchers to access case history input parameters and processing details, and to compare the case history processing protocols with the ones of different researchers (e.g.: "The influence of SPT procedures in Soil Liquefaction resistance evaluations." [2], "SPT-based Liquefaction triggering procedures." [3]).
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the use of the spt based seismic Soil Liquefaction triggering evaluation methodology in engineering hazard assessments
MethodsX, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract Probabilistic and deterministic seismic Soil Liquefaction triggering methodologies are proposed in Cetin et al. [1]. This manuscript: i) presents the protocols, which need to be followed for the correct use of this methodology for forward engineering (design) assessments, ii) guides the engineers through the procedure, and iii) discusses the “tricks” alongside the protocol. An illustrative Soil profile shaken by a scenario earthquake is presented, through which consistent estimations of representative SPT blow-counts along with fines content are discussed. Additionally, the estimation of CSR input parameters are illustrated. Last but not least the uncertainty estimations of these input parameters are presented along with the probability and factory of safety for the assessment of Liquefaction triggering. • A simplified methodology and its use to assess Liquefaction triggering hazard of a Soil site under an earthquake scenario event. • The consistent and unbiased mean estimates of input parameters of SPT blow-counts( N 1,60 ), fines content ( F C ), vertical effective ( s ' v ) and total ( s v ) stresses, maximum ground acceleration ( a m a x ), stress reduction (or non-linear shear mass participation) factor ( r d ) and moment magnitude ( M w ) along with their uncertainties are discussed. • Outlined methodology enables engineers to estimate the probability of- and factor of safety against- seismic Soil Liquefaction triggering for design problems.
Onder K Cetin - One of the best experts on this subject based on the ideXlab platform.
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examination of differences between three spt based seismic Soil Liquefaction triggering relationships
Soil Dynamics and Earthquake Engineering, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract The preceding companion paper presented the updating of the seismic Soil Liquefaction triggering relationship of Cetin et al. [1], and compared the resulting updated relationship with the earlier version. In this second paper, a detailed cross-comparison is made between three triggering relationships: (1) Seed et al. [2], as slightly updated by the NCEER Working Group (Youd et al. [3]), (2) Boulanger and Idriss [4], and (3) Cetin et al. [5]. Differences between these three triggering relationships, and the apparent causes of them are examined. Also studied are the impacts of these differences on levels of conservatism with regard to evaluation of Liquefaction triggering hazard, and the resulting risks for engineering projects.
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dataset on spt based seismic Soil Liquefaction
Data in Brief, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:This data article provides a summary of seismic Soil Liquefaction triggering and non-triggering case histories, which were compiled, screened for data completeness and quality, and then processed for the development of triggering relationships proposed in "SPT-based probabilistic and deterministic assessment of seismic Soil Liquefaction triggering hazard" [1]. The database is composed of 113 Liquefaction, 95 non-Liquefaction, and 2 marginal Liquefaction case histories, from seismic events with moment magnitude Mw values varying in the range of 5.9 to 8.3. A spreadsheet summary of these case histories are included along with a separate spreadsheet, by which maximum likelihood assessment was performed. These data transparently enable researchers to access case history input parameters and processing details, and to compare the case history processing protocols with the ones of different researchers (e.g.: "The influence of SPT procedures in Soil Liquefaction resistance evaluations." [2], "SPT-based Liquefaction triggering procedures." [3]).
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the use of the spt based seismic Soil Liquefaction triggering evaluation methodology in engineering hazard assessments
MethodsX, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract Probabilistic and deterministic seismic Soil Liquefaction triggering methodologies are proposed in Cetin et al. [1]. This manuscript: i) presents the protocols, which need to be followed for the correct use of this methodology for forward engineering (design) assessments, ii) guides the engineers through the procedure, and iii) discusses the “tricks” alongside the protocol. An illustrative Soil profile shaken by a scenario earthquake is presented, through which consistent estimations of representative SPT blow-counts along with fines content are discussed. Additionally, the estimation of CSR input parameters are illustrated. Last but not least the uncertainty estimations of these input parameters are presented along with the probability and factory of safety for the assessment of Liquefaction triggering. • A simplified methodology and its use to assess Liquefaction triggering hazard of a Soil site under an earthquake scenario event. • The consistent and unbiased mean estimates of input parameters of SPT blow-counts( N 1,60 ), fines content ( F C ), vertical effective ( s ' v ) and total ( s v ) stresses, maximum ground acceleration ( a m a x ), stress reduction (or non-linear shear mass participation) factor ( r d ) and moment magnitude ( M w ) along with their uncertainties are discussed. • Outlined methodology enables engineers to estimate the probability of- and factor of safety against- seismic Soil Liquefaction triggering for design problems.
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assessment of seismic Soil Liquefaction triggering beneath building foundation systems
Soil Dynamics and Earthquake Engineering, 2012Co-Authors: Onder K Cetin, Berna Unutmaz, Boris JeremicAbstract:Although there exist some consensus on seismic Soil Liquefaction assessment of free field level Soil sites, estimating Liquefaction triggering potential beneath foundations still stays as a controversial and difficult issue. Assessing Liquefaction triggering potential under mat foundations requires the estimation of cyclic and static stresses and the state of the Soil medium. As part of these studies, conventionally used normalized cyclic demand term, cyclic stress ratio, is to be estimated addressing the seismic interaction of overlying structure with foundation Soils. For this purpose, three-dimensional, finite difference-based total stress analyses were performed for generic Soil, structure and earthquake combinations. A simplified procedure was then developed, which produced unbiased estimates of the representative and maximum Soil-structure-earthquake-induced cyclic stress ratio values, an alternative, in the preliminary design stage, or complementary in the final design stage, to 3-D dynamic response assessment of Soil and structure systems. Consistent with the available literature, the descriptive (input) parameters of the proposed model were selected as Soil-to-structure stiffness ratio, spectral acceleration to peak ground acceleration ratio and aspect ratio of the building. The model coefficients were estimated through maximum likelihood methodology, which was used to produce an unbiased match with the predictions of 3-D analyses and proposed simplified model. Although a satisfactory fit was achieved among CSR estimations, validation of the proposed simplified procedure, further with available laboratory shaking table and centrifuge tests was preferred. The proposed simplified procedure was shown to capture most of the amplitudes and almost all of the variational trends of CSR.
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standard penetration test based probabilistic and deterministic assessment of seismic Soil Liquefaction potential
Journal of Geotechnical and Geoenvironmental Engineering, 2004Co-Authors: Onder K Cetin, Leslie F Harder, Raymond B Seed, Robert E Kayen, Kohji Tokimatsu, Armen Der Kiureghian, Robert E S MossAbstract:This paper presents new correlations for assessment of the likelihood of initiation (or “triggering”) of Soil Liquefaction. These new correlations eliminate several sources of bias intrinsic to previous, similar correlations, and provide greatly reduced overall uncertainty and variance. Key elements in the development of these new correlations are (1) accumulation of a significantly expanded database of field performance case histories; (2) use of improved knowledge and understanding of factors affecting interpretation of standard penetration test data; (3) incorporation of improved understanding of factors affecting site-specific earthquake ground motions (including directivity effects, site-specific response, etc.); (4) use of improved methods for assessment of in situ cyclic shear stress ratio; (5) screening of field data case histories on a quality/uncertainty basis; and (6) use of high-order probabilistic tools (Bayesian updating). The resulting relationships not only provide greatly reduced uncertai...
Robb E S Moss - One of the best experts on this subject based on the ideXlab platform.
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examination of differences between three spt based seismic Soil Liquefaction triggering relationships
Soil Dynamics and Earthquake Engineering, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract The preceding companion paper presented the updating of the seismic Soil Liquefaction triggering relationship of Cetin et al. [1], and compared the resulting updated relationship with the earlier version. In this second paper, a detailed cross-comparison is made between three triggering relationships: (1) Seed et al. [2], as slightly updated by the NCEER Working Group (Youd et al. [3]), (2) Boulanger and Idriss [4], and (3) Cetin et al. [5]. Differences between these three triggering relationships, and the apparent causes of them are examined. Also studied are the impacts of these differences on levels of conservatism with regard to evaluation of Liquefaction triggering hazard, and the resulting risks for engineering projects.
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dataset on spt based seismic Soil Liquefaction
Data in Brief, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:This data article provides a summary of seismic Soil Liquefaction triggering and non-triggering case histories, which were compiled, screened for data completeness and quality, and then processed for the development of triggering relationships proposed in "SPT-based probabilistic and deterministic assessment of seismic Soil Liquefaction triggering hazard" [1]. The database is composed of 113 Liquefaction, 95 non-Liquefaction, and 2 marginal Liquefaction case histories, from seismic events with moment magnitude Mw values varying in the range of 5.9 to 8.3. A spreadsheet summary of these case histories are included along with a separate spreadsheet, by which maximum likelihood assessment was performed. These data transparently enable researchers to access case history input parameters and processing details, and to compare the case history processing protocols with the ones of different researchers (e.g.: "The influence of SPT procedures in Soil Liquefaction resistance evaluations." [2], "SPT-based Liquefaction triggering procedures." [3]).
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the use of the spt based seismic Soil Liquefaction triggering evaluation methodology in engineering hazard assessments
MethodsX, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract Probabilistic and deterministic seismic Soil Liquefaction triggering methodologies are proposed in Cetin et al. [1]. This manuscript: i) presents the protocols, which need to be followed for the correct use of this methodology for forward engineering (design) assessments, ii) guides the engineers through the procedure, and iii) discusses the “tricks” alongside the protocol. An illustrative Soil profile shaken by a scenario earthquake is presented, through which consistent estimations of representative SPT blow-counts along with fines content are discussed. Additionally, the estimation of CSR input parameters are illustrated. Last but not least the uncertainty estimations of these input parameters are presented along with the probability and factory of safety for the assessment of Liquefaction triggering. • A simplified methodology and its use to assess Liquefaction triggering hazard of a Soil site under an earthquake scenario event. • The consistent and unbiased mean estimates of input parameters of SPT blow-counts( N 1,60 ), fines content ( F C ), vertical effective ( s ' v ) and total ( s v ) stresses, maximum ground acceleration ( a m a x ), stress reduction (or non-linear shear mass participation) factor ( r d ) and moment magnitude ( M w ) along with their uncertainties are discussed. • Outlined methodology enables engineers to estimate the probability of- and factor of safety against- seismic Soil Liquefaction triggering for design problems.
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shear wave velocity based probabilistic and deterministic assessment of seismic Soil Liquefaction potential
Journal of Geotechnical and Geoenvironmental Engineering, 2013Co-Authors: Robert E Kayen, Robb E S Moss, Raymond B Seed, Eric M Thompson, K O Cetin, Der A Kiureghian, Yoshiaki Tanaka, Kohji TokimatsuAbstract:AbstractShear-wave velocity (Vs) offers a means to determine the seismic resistance of Soil to Liquefaction by a fundamental Soil property. This paper presents the results of an 11-year international project to gather new Vs site data and develop probabilistic correlations for seismic Soil Liquefaction occurrence. Toward that objective, shear-wave velocity test sites were identified, and measurements made for 301 new Liquefaction field case histories in China, Japan, Taiwan, Greece, and the United States over a decade. The majority of these new case histories reoccupy those previously investigated by penetration testing. These new data are combined with previously published case histories to build a global catalog of 422 case histories of Vs Liquefaction performance. Bayesian regression and structural reliability methods facilitate a probabilistic treatment of the Vs catalog for performance-based engineering applications. Where possible, uncertainties of the variables comprising both the seismic demand an...
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cpt based probabilistic and deterministic assessment of in situ seismic Soil Liquefaction potential
Journal of Geotechnical and Geoenvironmental Engineering, 2006Co-Authors: Robb E S Moss, Raymond B Seed, Robert E Kayen, Der A Kiureghian, Jonathan P Stewart, K O CetinAbstract:This paper presents a complete methodology for both probabilistic and deterministic assessment of seismic Soil Liquefaction triggering potential based on the cone penetration test (CPT). A comprehensive worldwide set of CPT-based Liquefaction field case histories were compiled and back analyzed, and the data then used to develop probabilistic triggering correlations. Issues investigated in this study include improved normalization of CPT resistance measurements for the influence of effective overburden stress, and adjustment to CPT tip resistance for the potential influence of "thin" liquefiable layers. The effects of Soil type and Soil character (i.e., "fines" adjustment) for the new correlations are based on a combination of CPT tip and sleeve resistance. To quantify probability for performance-based engineering applications, Bayesian "regression" methods were used, and the uncertainties of all variables comprising both the seismic demand and the Liquefaction resistance were estimated and included in the analysis. The resulting correlations were developed using a Bayesian framework and are presented in both probabilistic and deterministic formats. The results are compared to previous probabilistic and deterministic correlations.
Robert E Kayen - One of the best experts on this subject based on the ideXlab platform.
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examination of differences between three spt based seismic Soil Liquefaction triggering relationships
Soil Dynamics and Earthquake Engineering, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract The preceding companion paper presented the updating of the seismic Soil Liquefaction triggering relationship of Cetin et al. [1], and compared the resulting updated relationship with the earlier version. In this second paper, a detailed cross-comparison is made between three triggering relationships: (1) Seed et al. [2], as slightly updated by the NCEER Working Group (Youd et al. [3]), (2) Boulanger and Idriss [4], and (3) Cetin et al. [5]. Differences between these three triggering relationships, and the apparent causes of them are examined. Also studied are the impacts of these differences on levels of conservatism with regard to evaluation of Liquefaction triggering hazard, and the resulting risks for engineering projects.
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dataset on spt based seismic Soil Liquefaction
Data in Brief, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:This data article provides a summary of seismic Soil Liquefaction triggering and non-triggering case histories, which were compiled, screened for data completeness and quality, and then processed for the development of triggering relationships proposed in "SPT-based probabilistic and deterministic assessment of seismic Soil Liquefaction triggering hazard" [1]. The database is composed of 113 Liquefaction, 95 non-Liquefaction, and 2 marginal Liquefaction case histories, from seismic events with moment magnitude Mw values varying in the range of 5.9 to 8.3. A spreadsheet summary of these case histories are included along with a separate spreadsheet, by which maximum likelihood assessment was performed. These data transparently enable researchers to access case history input parameters and processing details, and to compare the case history processing protocols with the ones of different researchers (e.g.: "The influence of SPT procedures in Soil Liquefaction resistance evaluations." [2], "SPT-based Liquefaction triggering procedures." [3]).
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the use of the spt based seismic Soil Liquefaction triggering evaluation methodology in engineering hazard assessments
MethodsX, 2018Co-Authors: Onder K Cetin, Robb E S Moss, Raymond B Seed, Robert E Kayen, Tolga H Bilge, Makbule Ilgac, Khaled ChowdhuryAbstract:Abstract Probabilistic and deterministic seismic Soil Liquefaction triggering methodologies are proposed in Cetin et al. [1]. This manuscript: i) presents the protocols, which need to be followed for the correct use of this methodology for forward engineering (design) assessments, ii) guides the engineers through the procedure, and iii) discusses the “tricks” alongside the protocol. An illustrative Soil profile shaken by a scenario earthquake is presented, through which consistent estimations of representative SPT blow-counts along with fines content are discussed. Additionally, the estimation of CSR input parameters are illustrated. Last but not least the uncertainty estimations of these input parameters are presented along with the probability and factory of safety for the assessment of Liquefaction triggering. • A simplified methodology and its use to assess Liquefaction triggering hazard of a Soil site under an earthquake scenario event. • The consistent and unbiased mean estimates of input parameters of SPT blow-counts( N 1,60 ), fines content ( F C ), vertical effective ( s ' v ) and total ( s v ) stresses, maximum ground acceleration ( a m a x ), stress reduction (or non-linear shear mass participation) factor ( r d ) and moment magnitude ( M w ) along with their uncertainties are discussed. • Outlined methodology enables engineers to estimate the probability of- and factor of safety against- seismic Soil Liquefaction triggering for design problems.
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shear wave velocity based probabilistic and deterministic assessment of seismic Soil Liquefaction potential
Journal of Geotechnical and Geoenvironmental Engineering, 2013Co-Authors: Robert E Kayen, Robb E S Moss, Raymond B Seed, Eric M Thompson, K O Cetin, Der A Kiureghian, Yoshiaki Tanaka, Kohji TokimatsuAbstract:AbstractShear-wave velocity (Vs) offers a means to determine the seismic resistance of Soil to Liquefaction by a fundamental Soil property. This paper presents the results of an 11-year international project to gather new Vs site data and develop probabilistic correlations for seismic Soil Liquefaction occurrence. Toward that objective, shear-wave velocity test sites were identified, and measurements made for 301 new Liquefaction field case histories in China, Japan, Taiwan, Greece, and the United States over a decade. The majority of these new case histories reoccupy those previously investigated by penetration testing. These new data are combined with previously published case histories to build a global catalog of 422 case histories of Vs Liquefaction performance. Bayesian regression and structural reliability methods facilitate a probabilistic treatment of the Vs catalog for performance-based engineering applications. Where possible, uncertainties of the variables comprising both the seismic demand an...
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cpt based probabilistic and deterministic assessment of in situ seismic Soil Liquefaction potential
Journal of Geotechnical and Geoenvironmental Engineering, 2006Co-Authors: Robb E S Moss, Raymond B Seed, Robert E Kayen, Der A Kiureghian, Jonathan P Stewart, K O CetinAbstract:This paper presents a complete methodology for both probabilistic and deterministic assessment of seismic Soil Liquefaction triggering potential based on the cone penetration test (CPT). A comprehensive worldwide set of CPT-based Liquefaction field case histories were compiled and back analyzed, and the data then used to develop probabilistic triggering correlations. Issues investigated in this study include improved normalization of CPT resistance measurements for the influence of effective overburden stress, and adjustment to CPT tip resistance for the potential influence of "thin" liquefiable layers. The effects of Soil type and Soil character (i.e., "fines" adjustment) for the new correlations are based on a combination of CPT tip and sleeve resistance. To quantify probability for performance-based engineering applications, Bayesian "regression" methods were used, and the uncertainties of all variables comprising both the seismic demand and the Liquefaction resistance were estimated and included in the analysis. The resulting correlations were developed using a Bayesian framework and are presented in both probabilistic and deterministic formats. The results are compared to previous probabilistic and deterministic correlations.
