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A study on low strain integrity testing of platform-pile system using staggered grid finite difference method
Abstract To study the three-dimensional characteristics of wave propagation in platform-pile system, a three-dimensional computation model for transient vibration of platform-pile-soil system is established. Based on initial and boundary conditions, the numerical solution of this model is obtained. A MATLAB program is compiled through using staggered grid finite difference method. The dynamic response of the integrate pile in platform-pile-soil system is got under vertical impact force, and the reliability and feasibility of the numerical simulation are corroborated by comparing calculation result with measured data of low strain integrity testing of platform-pile system. The optimal sensor location at platform top is studied. The results show the position distancing the pile center 0.5R~0.6R (R is pile radius) is the optimal sensor location, which the line between sensor location and pile center parallels the short side. It plays a certain role in reducing three-dimensional interference through increasing shear wave velocity of surrounding soil and appropriately increasing the ratio of characteristic wavelength to pile radius. In addition, contact area has less influence on low strain integrity testing of platform-pile system.
Highlights Adopt three-dimensional staggered grid finite difference method for low-strain integrity testing of platform-pile system. This article presents the best sensor location when low-strain testing is used in the integrity testing of the piles of platform-pile system. Accurately identify and locate the defects in pile by comparing the tested curves with the simulated curves of intact pile.
A study on low strain integrity testing of platform-pile system using staggered grid finite difference method
Abstract To study the three-dimensional characteristics of wave propagation in platform-pile system, a three-dimensional computation model for transient vibration of platform-pile-soil system is established. Based on initial and boundary conditions, the numerical solution of this model is obtained. A MATLAB program is compiled through using staggered grid finite difference method. The dynamic response of the integrate pile in platform-pile-soil system is got under vertical impact force, and the reliability and feasibility of the numerical simulation are corroborated by comparing calculation result with measured data of low strain integrity testing of platform-pile system. The optimal sensor location at platform top is studied. The results show the position distancing the pile center 0.5R~0.6R (R is pile radius) is the optimal sensor location, which the line between sensor location and pile center parallels the short side. It plays a certain role in reducing three-dimensional interference through increasing shear wave velocity of surrounding soil and appropriately increasing the ratio of characteristic wavelength to pile radius. In addition, contact area has less influence on low strain integrity testing of platform-pile system.
Highlights Adopt three-dimensional staggered grid finite difference method for low-strain integrity testing of platform-pile system. This article presents the best sensor location when low-strain testing is used in the integrity testing of the piles of platform-pile system. Accurately identify and locate the defects in pile by comparing the tested curves with the simulated curves of intact pile.
A study on low strain integrity testing of platform-pile system using staggered grid finite difference method
Jiang, Jing (author) / Liu, Dong Jia (author) / Lu, Zhi Tang (author) / Tao, Jun (author) / Liu, Hua Xuan (author)
Soil Dynamics and Earthquake Engineering ; 67 ; 345-352
2014-10-11
8 pages
Article (Journal)
Electronic Resource
English
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