Horizontal vibration characteristics of offshore elevated piles

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 88-94.

FU Peng1, 2, HU Anfeng1, 2, LI Yijun1, 2, XIE Kanghe1, 2, LI Long1, 2

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Abstract

Here, considering hydrodynamic pressure action and pile-fluid coupled vibration, the horizontal vibration problem of an offshore elevated pile in viscoelastic foundation was investigated theoretically.The governing equation of fluid motion was solved with the separation variable method, and the analytical expression for hydrodynamic pressure was obtained.Considering pile-soil body coupled condition and pile-fluid one as well as continuity conditions of pile’s internal force and displacement, based on the transfer matrix method, the analytical expression for dynamic impedance at an offshore elevated pile’s top was solved under action of a horizontal simple harmonic load.The problem studied here was degenerated into the vibration problem of a cylinder beam in water and the horizontal vibration problem of a fully embedded pile, and then the gained solutions were compared with the existing ones published in literature to verify the rationality of the solution obtained here.The calculation results here were compared to those without considering hydrodynamic pressure, it was shown that neglecting hydrodynamic pressure can overestimate the horizontal dynamic impedance at an offshore elevated pile’s top.

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offshore elevated piles / horizontal vibration / hydrodynamic pressure / transfer-matrix formulation

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FU Peng1, 2, HU Anfeng1, 2, LI Yijun1, 2, XIE Kanghe1, 2, LI Long1, 2. Horizontal vibration characteristics of offshore elevated piles[J]. Journal of Vibration and Shock, 2019, 38(17): 88-94

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