The Experts below are selected from a list of 22125 Experts worldwide ranked by ideXlab platform
Wei Zheng - One of the best experts on this subject based on the ideXlab platform.
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a semi empirical model for peak strain prediction of buried x80 steel pipelines under compression and bending at strike slip Fault crossings
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Hong Zhang, Wei ZhengAbstract:Abstract The strike-slip Fault is a main type of permanent ground deformation (PGD) faced by long distance gas pipelines. Based on the non-linear finite element method, a numerical model for buried pipelines at strike-slip Fault crossings under compression combined with bending was proposed at first. The model, with the advantages of reduced time consumption and high precision, was proven to be reasonable by comparing the numerical results with previous researchers' experiments and numerical results. The peak compressive strain of X80 steel pipelines subjected to strike-slip Fault Displacement under compression combined with bending was studied using the FE model. According to the investigation of the Second West to East Gas Pipeline Project, suitable ranges of all parameters, including the pipe diameter, wall thickness, soil properties, Fault Displacement and crossing angle, were obtained. The influence of these parameters on the peak compressive strain was discussed in detail. A regression equation for predicting the peak compressive strain of X80 steel pipelines was derived based on approximately 800 numerical results and regression analysis, and the applicable range of the formula was given. 15 true design cases of the Second West to East Pipeline Project in China were investigated to demonstrate the accuracy and applicability of the proposed methodology by comparing the predicted peak compressive strain results with the FEM results. It was shown that the proposed semi-empirical model predicts the peak compressive strain with good accuracy much less time consumption. It is thus applicable for the strain-based and reliability-based design of X80 steel pipelines subjected to strike-slip Fault Displacement.
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a semi empirical model for peak strain prediction of buried x80 steel pipelines under compression and bending at strike slip Fault crossings
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Yinshan Han, Wei ZhengAbstract:Abstract The strike-slip Fault is a main type of permanent ground deformation (PGD) faced by long distance gas pipelines. Based on the non-linear finite element method, a numerical model for buried pipelines at strike-slip Fault crossings under compression combined with bending was proposed at first. The model, with the advantages of reduced time consumption and high precision, was proven to be reasonable by comparing the numerical results with previous researchers' experiments and numerical results. The peak compressive strain of X80 steel pipelines subjected to strike-slip Fault Displacement under compression combined with bending was studied using the FE model. According to the investigation of the Second West to East Gas Pipeline Project, suitable ranges of all parameters, including the pipe diameter, wall thickness, soil properties, Fault Displacement and crossing angle, were obtained. The influence of these parameters on the peak compressive strain was discussed in detail. A regression equation for predicting the peak compressive strain of X80 steel pipelines was derived based on approximately 800 numerical results and regression analysis, and the applicable range of the formula was given. 15 true design cases of the Second West to East Pipeline Project in China were investigated to demonstrate the accuracy and applicability of the proposed methodology by comparing the predicted peak compressive strain results with the FEM results. It was shown that the proposed semi-empirical model predicts the peak compressive strain with good accuracy much less time consumption. It is thus applicable for the strain-based and reliability-based design of X80 steel pipelines subjected to strike-slip Fault Displacement.
Zachary E. Ross - One of the best experts on this subject based on the ideXlab platform.
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Probabilistic Fault Displacement Hazard Analysis for Reverse Faults
Bulletin of the Seismological Society of America, 2011Co-Authors: Robb E.s. Moss, Zachary E. RossAbstract:We present a methodology for evaluating potential surface Fault Displacement due to reverse Faulting events in a probabilistic manner. This methodology, called probabilistic Fault Displacement hazard analysis (PFDHA) follows procedures that were originally applied to normal Faulting. We present empirical distributions for surface rupture, maximum and average Displacement, spatial variability of slip, and other random variables that are central to performing PFDHA for reverse Faults. Additionally, a sensitivity analysis is conducted on all independent variables in the PFDHA procedure. The Los Osos Fault zone of central California is used as the test case, and results are presented in the form of a hazard curve. The influence each of the variables has on a hazard curve is quantified to provide direction for future research in PFDHA. It is seen that a distribution for slip spatial variability is the least influential term in the procedure, and a term for the probability of surface rupture has the most influence.
Hong Zhang - One of the best experts on this subject based on the ideXlab platform.
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local buckling behavior and plastic deformation capacity of high strength pipe at strike slip Fault crossing
Metals, 2017Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Baodong Wang, Qian Zheng, Yinshan HanAbstract:As a typical hazard threat for buried pipelines, an active Fault can induce large plastic deformation in a pipe, leading to rupture failure. The mechanical behavior of high-strength X80 pipeline subjected to strike-slip Fault Displacements was investigated in detail in the presented study with parametric analysis performed by the finite element model, which simulates pipe and soil constraints on pipe by shell and nonlinear spring elements respectively. Accuracy of the numerical model was validated by previous full-scale experimental results. Insight of local buckling response of high-strength pipe under compressive strike-slip Fault was revealed. Effects of the pipe-Fault intersection angle, pipe operation pressure, pipe wall thickness, soil parameters and pipe buried depth on critical section axial force in buckled area, critical Fault Displacement, critical compressive strain and post buckling response were elucidated comprehensively. In addition, feasibility of some common buckling failure criteria (i.e., the CSA Z662 model proposed by Canadian Standard association, the UOA model proposed by University of Alberta and the CRES-GB50470 model proposed by Center of Reliable Energy System) was discussed by comparing with numerical results. This study can be referenced for performance-based design and assessment of buried high-strength pipe in geo-hazard areas.
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Buckling failure mode analysis of buried X80 steel gas pipeline under reverse Fault Displacement
Engineering Failure Analysis, 2017Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Yanfei ChenAbstract:Abstract High strength steel pipeline is widely used in long distance transportation of natural gas. These pipelines are vulnerable under active Faults in strong seismic areas. The buckling failure modes of high strength X80 gas pipeline crossing reverse Fault were analyzed systematically in this paper. Based on the nonlinear finite element method, a pipe-elbow hybrid model was developed for buckling failure analysis of X80 steel pipeline under reverse Fault Displacement. The pipe soil interaction relationship was simulated by a series of elastic-plastic soil springs. The nonlinearity of pipe material and large deformation were also considered. The non-linear stabilization algorithm was selected due to the convergence of the numerical model. Engineering parameters used in the Second West to East Gas Pipeline in China were selected in this study. Typical features for beam buckling and local buckling failure in the proposed numerical model were derived. Based on a series of parametric studies, the influences of the Fault Displacement, Fault dip angle, pipe wall thickness, buried depth of pipe and soil conditions on the buckling failure modes were discussed in detail. The proposed methodology can be referenced for failure analysis and strength evaluation of pipelines subjected to reverse Fault Displacement.
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a semi empirical model for peak strain prediction of buried x80 steel pipelines under compression and bending at strike slip Fault crossings
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Hong Zhang, Wei ZhengAbstract:Abstract The strike-slip Fault is a main type of permanent ground deformation (PGD) faced by long distance gas pipelines. Based on the non-linear finite element method, a numerical model for buried pipelines at strike-slip Fault crossings under compression combined with bending was proposed at first. The model, with the advantages of reduced time consumption and high precision, was proven to be reasonable by comparing the numerical results with previous researchers' experiments and numerical results. The peak compressive strain of X80 steel pipelines subjected to strike-slip Fault Displacement under compression combined with bending was studied using the FE model. According to the investigation of the Second West to East Gas Pipeline Project, suitable ranges of all parameters, including the pipe diameter, wall thickness, soil properties, Fault Displacement and crossing angle, were obtained. The influence of these parameters on the peak compressive strain was discussed in detail. A regression equation for predicting the peak compressive strain of X80 steel pipelines was derived based on approximately 800 numerical results and regression analysis, and the applicable range of the formula was given. 15 true design cases of the Second West to East Pipeline Project in China were investigated to demonstrate the accuracy and applicability of the proposed methodology by comparing the predicted peak compressive strain results with the FEM results. It was shown that the proposed semi-empirical model predicts the peak compressive strain with good accuracy much less time consumption. It is thus applicable for the strain-based and reliability-based design of X80 steel pipelines subjected to strike-slip Fault Displacement.
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a semi empirical model for peak strain prediction of buried x80 steel pipelines under compression and bending at strike slip Fault crossings
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Yinshan Han, Wei ZhengAbstract:Abstract The strike-slip Fault is a main type of permanent ground deformation (PGD) faced by long distance gas pipelines. Based on the non-linear finite element method, a numerical model for buried pipelines at strike-slip Fault crossings under compression combined with bending was proposed at first. The model, with the advantages of reduced time consumption and high precision, was proven to be reasonable by comparing the numerical results with previous researchers' experiments and numerical results. The peak compressive strain of X80 steel pipelines subjected to strike-slip Fault Displacement under compression combined with bending was studied using the FE model. According to the investigation of the Second West to East Gas Pipeline Project, suitable ranges of all parameters, including the pipe diameter, wall thickness, soil properties, Fault Displacement and crossing angle, were obtained. The influence of these parameters on the peak compressive strain was discussed in detail. A regression equation for predicting the peak compressive strain of X80 steel pipelines was derived based on approximately 800 numerical results and regression analysis, and the applicable range of the formula was given. 15 true design cases of the Second West to East Pipeline Project in China were investigated to demonstrate the accuracy and applicability of the proposed methodology by comparing the predicted peak compressive strain results with the FEM results. It was shown that the proposed semi-empirical model predicts the peak compressive strain with good accuracy much less time consumption. It is thus applicable for the strain-based and reliability-based design of X80 steel pipelines subjected to strike-slip Fault Displacement.
Timothy E Dawson - One of the best experts on this subject based on the ideXlab platform.
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a worldwide and unified database of surface ruptures sure for Fault Displacement hazard analyses
Seismological Research Letters, 2020Co-Authors: Stephane Baize, Timothy E Dawson, Fiia Nurminen, Alexandra Sarmiento, Makoto Takao, Oona Scotti, Takashi Azuma, Paolo Boncio, Johann Champenois, F R CintiAbstract:Fault Displacement hazard assessment is based on empirical relationshipsthat are established using historic earthquake Fault ruptures.These relationships evaluate the likelihood of coseismicsurface slip considering on-Fault and off-Fault ruptures, for givenearthquake magnitude and distance to Fault. Moreover, theyallow predicting the amount of Fault slip at and close to theactive Fault of concern. Applications of this approach includeland use planning, structural design of infrastructure, and criticalfacilities located on or close to an active Fault.To date, the current equations are based on sparsely populateddatasets, including a limited number of pre-2000 events. In2015, an international effort started to constitute a worldwideand unified Fault Displacement database (SUrface Ruptures dueto Earthquakes [SURE]) to improve further hazard estimations.After two workshops, it was decided to unify the existingdatasets (field-based slip measurements) to incorporate recentand future cases, and to include new parameters relevant toproperly describe the rupture.This contribution presents the status of the SURE databaseand delineates some perspectives to improve the surface-Faultingassessment. Original data have been compiled and adaptedto the structure. The database encompasses 45 earthquakesfrom magnitude 5–7.9, with more than 15,000 coseismic surfacedeformation observations (including slip measurements)and 56,000 of rupture segments. Twenty earthquake cases arefrom Japan, 15 from United States, two from Mexico, Italy,and New Zealand, one from Kyrgystan, Ecuador, Turkey,and Argentina. Twenty-four earthquakes are strike-slip Faultingevents, 11 are normal or normal oblique, and 10 are reverseFaulting.To pursue the momentum, the initial and common implementationeffort needs to be continued and coordinated, and themaintenance and longevity of the database must be guaranteed.This effort must remain based on a large and open communityof earthquake geologists to create a free and open accessdatabase.
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Fault Displacement hazard for strike slip Faults
Bulletin of the Seismological Society of America, 2011Co-Authors: Mark D Petersen, Timothy E Dawson, Rui Chen, Tianqing Cao, Christopher J Wills, David P Schwartz, Arthur FrankelAbstract:In this paper we present a methodology, data, and regression equations for calculating the Fault rupture hazard at sites near steeply dipping, strike-slip Faults. We collected and digitized on-Fault and off-Fault Displacement data for 9 global strike- slip earthquakes ranging from moment magnitude M 6.5 to M 7.6 and supplemented these with Displacements from 13 global earthquakes compiled by Wesnousky (2008), who considers events up to M 7.9. Displacements on the primary Fault fall off at the rupture ends and are often measured in meters, while Displacements on secondary (off- Fault) or distributed Faults may measure a few centimeters up to more than a meter and decaywithdistancefromtherupture.Probabilityofearthquakeruptureislessthan15% for cells 200 m× 200 m and is less than 2% for 25 m× 25 m cells at distances greater than200mfromtheprimary-Faultrupture.Therefore,thehazardforoff-Faultrupturesis much lower than the hazard near the Fault. Our data indicate that rupture Displacements upto35cmcanbetriggeredonadjacentFaultsatdistancesoutto10kmormorefromthe primary-Fault rupture. An example calculation shows that, for an active Fault which has repeated large earthquakes every few hundred years, Fault rupture hazard analysis should be an important consideration in the design of structures or lifelines that are located near the principal Fault, within about 150 m of well-mapped active Faults with a simple trace and within 300 m of Faults with poorly defined or complex traces. Online Material: Description and tables of Displacement data, distributed rup- tures, mapping accuracy, and regression statistics.
Arthur Frankel - One of the best experts on this subject based on the ideXlab platform.
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Fault Displacement hazard for strike slip Faults
Bulletin of the Seismological Society of America, 2011Co-Authors: Mark D Petersen, Timothy E Dawson, Rui Chen, Tianqing Cao, Christopher J Wills, David P Schwartz, Arthur FrankelAbstract:In this paper we present a methodology, data, and regression equations for calculating the Fault rupture hazard at sites near steeply dipping, strike-slip Faults. We collected and digitized on-Fault and off-Fault Displacement data for 9 global strike- slip earthquakes ranging from moment magnitude M 6.5 to M 7.6 and supplemented these with Displacements from 13 global earthquakes compiled by Wesnousky (2008), who considers events up to M 7.9. Displacements on the primary Fault fall off at the rupture ends and are often measured in meters, while Displacements on secondary (off- Fault) or distributed Faults may measure a few centimeters up to more than a meter and decaywithdistancefromtherupture.Probabilityofearthquakeruptureislessthan15% for cells 200 m× 200 m and is less than 2% for 25 m× 25 m cells at distances greater than200mfromtheprimary-Faultrupture.Therefore,thehazardforoff-Faultrupturesis much lower than the hazard near the Fault. Our data indicate that rupture Displacements upto35cmcanbetriggeredonadjacentFaultsatdistancesoutto10kmormorefromthe primary-Fault rupture. An example calculation shows that, for an active Fault which has repeated large earthquakes every few hundred years, Fault rupture hazard analysis should be an important consideration in the design of structures or lifelines that are located near the principal Fault, within about 150 m of well-mapped active Faults with a simple trace and within 300 m of Faults with poorly defined or complex traces. Online Material: Description and tables of Displacement data, distributed rup- tures, mapping accuracy, and regression statistics.
