The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Daniel P. Valentine - One of the best experts on this subject based on the ideXlab platform.
-
Discussion of "Thrust Restraint Design of Concrete Pressure Pipe"
2005Co-Authors: Mehdi S. Zarghamee, Daniel W. Eggers, Rasko P. Ojdrovic, Daniel P. ValentineAbstract:The authors are to be complimented on their development of a design procedure for restraint of Pressure-induced thrust at bends in Pipelines, using concrete Pressure Pipe, which includes the effects of soil resistance to lateral movement of tied-Pipe. The authors’ procedure is a needed extension of a beam-on-elasticfoundation design procedure for thrust restraint of fiberglassreinforced plastic Pipe and fittings developed in the late 1970s Ameron 1980, but it is found to be lacking in some respects. Throughout this discussion, is substituted for the authors’ for compatibility with AWWA 1996.
-
Thrust Restraint Design of Concrete Pressure Pipe
Journal of Structural Engineering-asce, 2003Co-Authors: Mehdi S. Zarghamee, Daniel W. Eggers, Rasko P. Ojdrovic, Daniel P. ValentineAbstract:A finite-element model of a buried Pipeline consisting of concrete Pressure Pipe segments and joints is developed for analysis of longitudinal effects resulting from Pressure-induced thrust at a bend. The model accounts for longitudinal Pipe-to-soil friction, soil stiffness against transverse movement of the Pipe, tensile softening of concrete, yielding of steel cylinder, and the nonlinear behavior of the joint. The model is applied to the analysis of simple bends designed following the current thrust restraint design procedure. The results show that for the Pipes installed in stiff backfill, the current thrust restraint design procedure is adequate, although not with uniform safety factor over the range of all possible bend angles. However, the current thrust restraint design procedure does not protect the Pipes installed in soft highly plastic, clayey soils against failure. Based on the results of the finite-element model, a new design procedure is developed that accounts for thrust resistance by a combination of longitudinal soil friction and soil stiffness against transverse movement of the Pipe. The results of finite-element analysis of the designs by this procedure show adequate safety over the range of bend angles and soil stiffness values.
Hou Xiao-qian - One of the best experts on this subject based on the ideXlab platform.
-
Damage detection of Pressure Pipe based on statistical pattern recognition theory
South-to-north Water Transfers and Water Science & Technology, 2015Co-Authors: Hou Xiao-qianAbstract:Based on the statistical pattern recognition theory,the AMRA timing analysis method combined with the long autoregressive model residual method and the least squares method were used to estimate the model parameters and then to develop the system model.The mean control chart method was used to extract and select the vibration information and feature of the Pressure Pipe,therefore the damage of the Pressure Pipe can be identified effectively.The simulation results showed that structural abnormality test method of the mean control chart,which is based on the statistical pattern recognition theory,can diagnose the structural damage accurately,and is sensitive to the damage degree and location.
Yu Qiang Cheng - One of the best experts on this subject based on the ideXlab platform.
-
The Damage Detection of Pressure Pipe Based on the Statistical Pattern Recognition Theory
Advanced Materials Research, 2014Co-Authors: Su Min Zhao, We She He, Shuang Mei Chang, Yu Qiang ChengAbstract:Based on the statistical pattern recognition theory, the AMRA timing analysis methods are used in the article, through the combination of long autoregressive model residuals method and the least squares method the model parameters are estimated, and a system model is established. By using mean control chart method the vibration information and feature of the Pressure Pipe are extracted and selected, so whether the Pressure Pipes is damaged can be judged effectively. The simulation results show that structural abnormalities test method of the mean value ,which is Based on the recognition theory of statistical pattern, can accurately diagnose structural damage detection state ,the injury degree and damage location, it has a very strong sensitivity
Mehdi S. Zarghamee - One of the best experts on this subject based on the ideXlab platform.
-
Discussion of "Thrust Restraint Design of Concrete Pressure Pipe"
2005Co-Authors: Mehdi S. Zarghamee, Daniel W. Eggers, Rasko P. Ojdrovic, Daniel P. ValentineAbstract:The authors are to be complimented on their development of a design procedure for restraint of Pressure-induced thrust at bends in Pipelines, using concrete Pressure Pipe, which includes the effects of soil resistance to lateral movement of tied-Pipe. The authors’ procedure is a needed extension of a beam-on-elasticfoundation design procedure for thrust restraint of fiberglassreinforced plastic Pipe and fittings developed in the late 1970s Ameron 1980, but it is found to be lacking in some respects. Throughout this discussion, is substituted for the authors’ for compatibility with AWWA 1996.
-
Thrust Restraint Design of Concrete Pressure Pipe
Journal of Structural Engineering-asce, 2003Co-Authors: Mehdi S. Zarghamee, Daniel W. Eggers, Rasko P. Ojdrovic, Daniel P. ValentineAbstract:A finite-element model of a buried Pipeline consisting of concrete Pressure Pipe segments and joints is developed for analysis of longitudinal effects resulting from Pressure-induced thrust at a bend. The model accounts for longitudinal Pipe-to-soil friction, soil stiffness against transverse movement of the Pipe, tensile softening of concrete, yielding of steel cylinder, and the nonlinear behavior of the joint. The model is applied to the analysis of simple bends designed following the current thrust restraint design procedure. The results show that for the Pipes installed in stiff backfill, the current thrust restraint design procedure is adequate, although not with uniform safety factor over the range of all possible bend angles. However, the current thrust restraint design procedure does not protect the Pipes installed in soft highly plastic, clayey soils against failure. Based on the results of the finite-element model, a new design procedure is developed that accounts for thrust resistance by a combination of longitudinal soil friction and soil stiffness against transverse movement of the Pipe. The results of finite-element analysis of the designs by this procedure show adequate safety over the range of bend angles and soil stiffness values.
Su Min Zhao - One of the best experts on this subject based on the ideXlab platform.
-
The Damage Detection of Pressure Pipe Based on the Statistical Pattern Recognition Theory
Advanced Materials Research, 2014Co-Authors: Su Min Zhao, We She He, Shuang Mei Chang, Yu Qiang ChengAbstract:Based on the statistical pattern recognition theory, the AMRA timing analysis methods are used in the article, through the combination of long autoregressive model residuals method and the least squares method the model parameters are estimated, and a system model is established. By using mean control chart method the vibration information and feature of the Pressure Pipe are extracted and selected, so whether the Pressure Pipes is damaged can be judged effectively. The simulation results show that structural abnormalities test method of the mean value ,which is Based on the recognition theory of statistical pattern, can accurately diagnose structural damage detection state ,the injury degree and damage location, it has a very strong sensitivity
