The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Rongzhu Liang - One of the best experts on this subject based on the ideXlab platform.
-
torsional complex impedance of pipe pile considering pile installation and Soil Plug effect
Soil Dynamics and Earthquake Engineering, 2020Co-Authors: Yunpeng Zhang, Rongzhu Liang, Guosheng Jiang, Xiaoyan Yang, Hesham El M NaggarAbstract:Abstract Torsional vibrations of pipe pile are more complicated compared to solid pile. In actual engineering, pile surrounding Soil may be strengthened or weakened due to different pile installation methods, which is regarded as pile installation effect. At the same time, Soil Plug effect which describes the interaction between the Soil Plug and pile wall is also non-negligible in bearing analysis. Along the model of inhomogeneous medium, this paper subdivides the inhomogeneous Soil region into certain sub-zones whose shear complex stiffness are derived by virtue of continuity conditions and plain strain model. To study the influence of Soil Plug effect, the additional mass model is raised and utilized in this paper. In this model, the pile-Soil Plug system is vertically split into infinite sections, and each pipe pile section and Soil Plug section is connected by distributed Voigt model. The analytical solution of torsional complex impedance is acquired and compared with results obtained from former studies to verify its rationality. Finally, a parametric research is presented to exhibit the influence of the pile installation and Soil Plug effect on the torsional complex impedance of pipe pile head.
-
new method to calculate apparent phase velocity of open ended pipe pile
Canadian Geotechnical Journal, 2020Co-Authors: Hao Liu, Rongzhu Liang, Guosheng Jiang, Xiaoyan Yang, Hesham El M Naggar, Guoxiong MeiAbstract:The apparent phase velocity of open-ended pipe piles after installation is difficult to predict owing to the Soil-Plug effect. This paper derives an analytical solution to calculate the apparent ph...
-
influence of Soil Plug effect on the vertical dynamic response of large diameter pipe piles
Ocean Engineering, 2018Co-Authors: Hao Liu, Rongzhu Liang, Guosheng Jiang, Hesham El M Naggar, Guoxiong MeiAbstract:Abstract The influence of Soil Plug effect on the dynamic response of large diameter pipe piles during low-strain integrity testing is investigated based on the additional mass model, considering the Soil Plug weight and displacement phase difference between Soil Plug and pipe pile. An analytical solution that can consider the stress wave propagating both in the vertical and circumferential directions is derived in the frequency domain through the transfer function method. The corresponding quasi-analytical solution in the time domain for the pipe pile subjected to a vertical semi-sinusoidal impact force is then obtained by utilizing the Fourier transform technique. The validity and accuracy of the solution presented in this paper is compared against a series of model tests and field experiments of pipe pile. Utilizing the developed solution, a parametric study is performed to illustrate the influence of Soil Plug properties, pipe pile properties and the impulse width of impact force on the composite velocity of the longitudinal stress wave propagating in pipe pile, and the applicability of the plane-section assumption adopting in pipe pile.
-
Influence of Soil Plug effect on the torsional dynamic response of a pipe pile
Journal of Sound and Vibration, 2017Co-Authors: Guosheng Jiang, Wenbing Wu, M. Hesham El Naggar, Rongzhu LiangAbstract:Abstract The additional mass model is introduced to simulate the dynamic interaction of Soil Plug and pipe pile under small deformations and strains. In the additional mass model, the inertia and damping effect of Soil Plug, and the displacement phase difference between Soil Plug and pipe pile are taken into consideration. Based on the additional mass model, the analytical solutions of the torsional dynamic response of a pipe pile in the frequency domain are derived by utilizing the Laplace transform technique and impedance transfer function. The corresponding quasi-analytical solution in the time domain for a pipe pile subjected to semi-sinusoidal exciting force is obtained by using the inverse Fourier transform. A parameter sensitivity analysis of the additional mass model is conducted to determine the approximate range of the parameter values of the distributed Voigt model. The validity of the presented solutions is also verified by comparing the torsional dynamic behavior of the pipe pile calculated via the additional mass model with those based on the plane strain model. Utilizing the developed solutions, a parametric study is conducted to investigate the influence of the properties of Soil-pile system on the torsional vibration characteristics of pipe pile.
Hesham El M Naggar - One of the best experts on this subject based on the ideXlab platform.
-
torsional complex impedance of pipe pile considering pile installation and Soil Plug effect
Soil Dynamics and Earthquake Engineering, 2020Co-Authors: Yunpeng Zhang, Rongzhu Liang, Guosheng Jiang, Xiaoyan Yang, Hesham El M NaggarAbstract:Abstract Torsional vibrations of pipe pile are more complicated compared to solid pile. In actual engineering, pile surrounding Soil may be strengthened or weakened due to different pile installation methods, which is regarded as pile installation effect. At the same time, Soil Plug effect which describes the interaction between the Soil Plug and pile wall is also non-negligible in bearing analysis. Along the model of inhomogeneous medium, this paper subdivides the inhomogeneous Soil region into certain sub-zones whose shear complex stiffness are derived by virtue of continuity conditions and plain strain model. To study the influence of Soil Plug effect, the additional mass model is raised and utilized in this paper. In this model, the pile-Soil Plug system is vertically split into infinite sections, and each pipe pile section and Soil Plug section is connected by distributed Voigt model. The analytical solution of torsional complex impedance is acquired and compared with results obtained from former studies to verify its rationality. Finally, a parametric research is presented to exhibit the influence of the pile installation and Soil Plug effect on the torsional complex impedance of pipe pile head.
-
new method to calculate apparent phase velocity of open ended pipe pile
Canadian Geotechnical Journal, 2020Co-Authors: Hao Liu, Rongzhu Liang, Guosheng Jiang, Xiaoyan Yang, Hesham El M Naggar, Guoxiong MeiAbstract:The apparent phase velocity of open-ended pipe piles after installation is difficult to predict owing to the Soil-Plug effect. This paper derives an analytical solution to calculate the apparent ph...
-
influence of Soil Plug effect on the vertical dynamic response of large diameter pipe piles
Ocean Engineering, 2018Co-Authors: Hao Liu, Rongzhu Liang, Guosheng Jiang, Hesham El M Naggar, Guoxiong MeiAbstract:Abstract The influence of Soil Plug effect on the dynamic response of large diameter pipe piles during low-strain integrity testing is investigated based on the additional mass model, considering the Soil Plug weight and displacement phase difference between Soil Plug and pipe pile. An analytical solution that can consider the stress wave propagating both in the vertical and circumferential directions is derived in the frequency domain through the transfer function method. The corresponding quasi-analytical solution in the time domain for the pipe pile subjected to a vertical semi-sinusoidal impact force is then obtained by utilizing the Fourier transform technique. The validity and accuracy of the solution presented in this paper is compared against a series of model tests and field experiments of pipe pile. Utilizing the developed solution, a parametric study is performed to illustrate the influence of Soil Plug properties, pipe pile properties and the impulse width of impact force on the composite velocity of the longitudinal stress wave propagating in pipe pile, and the applicability of the plane-section assumption adopting in pipe pile.
-
new interaction model for vertical dynamic response of pipe piles considering Soil Plug effect
Canadian Geotechnical Journal, 2017Co-Authors: Hesham El M Naggar, Guoxiong Mei, Maged A Abdlrahem, Kuihua WangAbstract:A Soil–pile interaction model is developed to better represent the actual behavior of pipe piles undergoing dynamic testing. To correctly investigate the dynamic interaction mechanism of the pipe p...
Masataka Takei - One of the best experts on this subject based on the ideXlab platform.
-
effects of Soil Plug on behaviour of driven pipe piles
Soils and Foundations, 1991Co-Authors: Tatsunorl Matsumoto, Masataka TakeiAbstract:ABSTRACT Stress wave theory is applied to open-ended pipe piles to clarify the effects of Soil Plug on the behaviour of piles during driving and static loading. Measured field data and various numerical models are reviewed; methods are presented to calculate wave propagation in both the pile and the Soil Plug; modelling is presented which takes into account the interaction between the Soil Plug and the pile; also presented is simplified method to estimate the load-settlement relation of the pipe pile in static loading. By correlating observed and calculated values in two analytical cases, the authors demonstrate that incorporation of the Soil Plug (modelled as a series of masses and springs) is required to correctly predict pile behaviour during driving and static loading.
Jürgen Grabe - One of the best experts on this subject based on the ideXlab platform.
-
centrifuge tests investigating the effect of suction caisson installation in dense sand on the state of the Soil Plug
International Journal of Physical Modelling in Geotechnics, 2018Co-Authors: Marc Stapelfeldt, Britta Bienen, Jürgen GrabeAbstract:We acknowledge the support from the Deutsche Forschungsgemeinschaft (DFG) for our research project GR 1024/26-1 “Sauginstallation Maritimer Strukturen” (SIMS).
-
Numerical investigation of Soil Plugging inside open-ended piles with respect to the installation method
Acta Geotechnica, 2008Co-Authors: Sascha Henke, Jürgen GrabeAbstract:The development of a Soil Plug inside an open-ended pile with respect to the installation method is examined using numerical simulations. In this paper, the penetration process of an open-ended tubular pile with diameter D = 61 cm into granular Soil is investigated. The aim is to achieve a better understanding of the mechanisms of Soil Plugging inside open-ended piles with respect to the installation method. As an example, the horizontal stress distribution inside the tubular pile after installation shows significant increase depending on the installation method. The numerical results are compared to experimental data.
Tatsunorl Matsumoto - One of the best experts on this subject based on the ideXlab platform.
-
effects of Soil Plug on behaviour of driven pipe piles
Soils and Foundations, 1991Co-Authors: Tatsunorl Matsumoto, Masataka TakeiAbstract:ABSTRACT Stress wave theory is applied to open-ended pipe piles to clarify the effects of Soil Plug on the behaviour of piles during driving and static loading. Measured field data and various numerical models are reviewed; methods are presented to calculate wave propagation in both the pile and the Soil Plug; modelling is presented which takes into account the interaction between the Soil Plug and the pile; also presented is simplified method to estimate the load-settlement relation of the pipe pile in static loading. By correlating observed and calculated values in two analytical cases, the authors demonstrate that incorporation of the Soil Plug (modelled as a series of masses and springs) is required to correctly predict pile behaviour during driving and static loading.
