The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform
Sri Sritharan - One of the best experts on this subject based on the ideXlab platform.
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integration of construction control and Pile setup into Load and resistance factor design of Piles
Soils and Foundations, 2014Co-Authors: Kam W Ng, Sri SritharanAbstract:Abstract Regionally developed Load and Resistance Factor Design (LRFD) recommendations for bridge Pile designs are enhanced by integrating the construction control capability of dynamic analysis methods and the recently developed Pile setup quantification method in the calibration process. Using a high quality, electronic Pile Load Test (PILOT) database and 10 recently completed full-scale Pile Tests, resistance factors were developed using a reliability theory for a locally calibrated static analysis method and two dynamic analysis methods: the Wave Equation Analysis Program (WEAP) and the CAse Pile Wave Analysis Program (CAPWAP). Pile design efficiency was improved by minimizing the discrepancy between design and field Pile resistances through a proposed probability-based construction control method. The efficiency of bridge foundations was further increased by incorporating the economic advantages of Pile setup into the LRFD recommendations. Compared with recommendations made by Paikowsky et al. (2004) , Canadian Engineering Society (2006) and American Association of State Highway and Transportation Officials (2003) , regionally-calibrated resistance factors were improved.
Tony M Allen - One of the best experts on this subject based on the ideXlab platform.
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development of new Pile driving formula and its calibration for Load and resistance factor design
Transportation Research Record, 2007Co-Authors: Tony M AllenAbstract:Before 1997, the Washington State Department of Transportation (WSDOT) used the Engineering News (EN) formula for driving piling to design capacity. WSDOT-sponsored research published in 1988 had shown that the EN formula was quite inaccurate and that adopting the Gates formula would be a substantial improvement. In 1996, an in-house study was initiated to identify or develop a new driving formula to be used for routine Pile-driving acceptance in the WSDOT standard specifications. Recently, comPiled databases of Pile Load Test results were used as the basis for developing improvements to the Gates formula to improve the prediction accuracy of Pile-bearing resistance. From this empirical analysis, the WSDOT driving formula was derived. Once the WSDOT driving formula had been developed, the empirical data used for its development were also used to establish statistics that could be used in reliability analyses to determine resistance factors for Load and resistance factor design. The Monte Carlo method was ...
Kam W Ng - One of the best experts on this subject based on the ideXlab platform.
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integration of construction control and Pile setup into Load and resistance factor design of Piles
Soils and Foundations, 2014Co-Authors: Kam W Ng, Sri SritharanAbstract:Abstract Regionally developed Load and Resistance Factor Design (LRFD) recommendations for bridge Pile designs are enhanced by integrating the construction control capability of dynamic analysis methods and the recently developed Pile setup quantification method in the calibration process. Using a high quality, electronic Pile Load Test (PILOT) database and 10 recently completed full-scale Pile Tests, resistance factors were developed using a reliability theory for a locally calibrated static analysis method and two dynamic analysis methods: the Wave Equation Analysis Program (WEAP) and the CAse Pile Wave Analysis Program (CAPWAP). Pile design efficiency was improved by minimizing the discrepancy between design and field Pile resistances through a proposed probability-based construction control method. The efficiency of bridge foundations was further increased by incorporating the economic advantages of Pile setup into the LRFD recommendations. Compared with recommendations made by Paikowsky et al. (2004) , Canadian Engineering Society (2006) and American Association of State Highway and Transportation Officials (2003) , regionally-calibrated resistance factors were improved.
Parisa Rahimzadeh Oskooei - One of the best experts on this subject based on the ideXlab platform.
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numerical anfis based formulation for prediction of the ultimate axial Load bearing capacity of Piles through cpt data
Geotechnical and Geological Engineering, 2018Co-Authors: Behnam Ghorbani, Ehsan Sadrossadat, Jafar Bolouri Bazaz, Parisa Rahimzadeh OskooeiAbstract:This study explores the potential of adaptive neuro-fuzzy inference systems (ANFIS) for prediction of the ultimate axial Load bearing capacity of Piles (Pu) using cone penetration Test (CPT) data. In this regard, a reliable previously published database composed of 108 datasets was selected to develop ANFIS models. The collected database contains information regarding Pile geometry, material, installation, full-scale static Pile Load Test and CPT results for each sample. Reviewing the literature, several common and uncommon variables have been considered for direct or indirect estimation of Pu based on static Pile Load Test, cone penetration Test data or other in situ or laboratory Testing methods. In present study, the Pile shaft and tip area, the average cone tip resistance along the embedded length of the Pile, the average cone tip resistance over influence zone and the average sleeve friction along the embedded length of the Pile which are obtained from CPT data are considered as independent input variables where the output variable is Pu for the ANFIS model development. Besides, a notable criticism about ANFIS as a prediction tool is that it does not provide practical prediction equations. To tackle this issue, the obtained optimal ANFIS model is represented as a tractable equation which can be used via spread sheet software or hand calculations to provide precise predictions of Pu with the calculated correlation coefficient of 0.96 between predicted and experimental values for all of the data in this study. Considering several criteria, it is represented that the proposed model is able to estimate the output with a high degree of accuracy as compared to those results obtained by some direct CPT-based methods in the literature. Furthermore, in order to assess the capability of the proposed model from geotechnical engineering viewpoints, sensitivity and parametric analyses are done.
Jencheng Liao - One of the best experts on this subject based on the ideXlab platform.
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lateral response evaluation of single Piles using inclinometer data
Journal of Geotechnical and Geoenvironmental Engineering, 2006Co-Authors: Jencheng LiaoAbstract:In an effort to develop an efficient method for interpretation of lateral Pile Load Test results via measured inclinometer data only, an analytical model is proposed based on energy conservation of a Pile-soil system. A Fourier series function is used to represent deflection behavior of the Pile-soil system. In order to obtain shear, moment, and soil reaction along the Pile shaft, convergence of the series after differentiation is guaranteed by applying the Cesaro sum technique. The concrete cracking effect is also incorporated into the Pile model to account for yielding of the Pile itself. Three full-scale Pile Load cases are then used to verify the feasibility of the developed methodology as well as make comparison to other methods.
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lateral performance of Piles evaluated via inclinometer data
Computers and Geotechnics, 2005Co-Authors: Jencheng Liao, Jengtzong Chen, Li ChenAbstract:The performance of laterally Loaded Piles is often obtained via in situ lateral Pile–Load Tests. In general, inclinometer measurement is routinely used in these lateral Pile–Load Tests. In an effort to develop an efficient method for interpretation of lateral Pile–Load Test results via measured inclinometer data only, an analytical model is proposed based on the energy conservation of the Pile–soil system. A Fourier series function is used to represent the deflection behaviour of the Pile–soil system. To obtain the shear, moment and soil reaction along the Pile shaft, convergence of the series after differentiation is guaranteed by applying the Cesaro sum technique. Three full-scale lateral Pile–Load cases are then used to verify the feasibility of the methodology developed, as well as to make comparisons with other methods. � 2005 Elsevier Ltd. All rights reserved.