Influence of defects on the lateral dynamic characteristics of offshore piles considering hydrodynamic pressure

Chen, Libo; Wu, Wenbing; Líu, Hao; Naggar, M. Hesham El; Wen, Minjie; Wang, Kuihua

doi:10.1016/j.oceaneng.2022.111894

Cited by 24 publications

(5 citation statements)

References 36 publications

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“…The velocity potential of seawater at the interface of the pile and water should satisfy the following continuity conditions 32,40,41 :

\begin{equation}\frac{{\partial {p}_1}}{{\partial r}}| {_{r = {r}_1}} = \frac{{\partial {p}_2}}{{\partial r}}| {_{r = {r}_2}} = {\rho }_w{\omega }^2{u}_{pw}\cos \theta \end{equation}

where

{\rho }_w

is the mass density of the seawater.…”

Section: Formulation and Solutionmentioning

confidence: 99%

“…It is easily obtained from Equations ( 59) and (60) that: ; N w1 , N w2 , N w3 , N w4 , N s1 , N s2 , N s3 , and N s4 are integrating constants that can be determined by boundary conditions. The velocity potential of seawater at the interface of the pile and water should satisfy the following continuity conditions 32,40,41 :…”

Section: Solution Of the Governing Equation Of The Pipe Pilementioning

confidence: 99%

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Lateral kinematic response of offshore pipe piles to S‐wave seismic excitation

Zheng

Luo

Luan

2023

Num Anal Meth Geomechanics

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This paper presents an analytical study on the lateral kinematic response of offshore pipe piles subjected to vertically propagating S‐wave seismic excitation. Both the kinematic interaction of the pipe pile with the soil and seawater are considered. The lateral resistances of the outer and inner soil are obtained based on the confined viscoelastic dynamic continuum models, while the hydrodynamic pressures of the seawater are based on the inviscid incompressible fluid theory. The pile response is then obtained by utilizing the continuity condition at the soil‐pile and seawater‐pile interfaces along the pile shaft. The derived solution is employed to investigate the sensitivity of the seismic response of pipe piles to certain key problem parameters, such as length of pile segment embedded in seawater, the relative stiffness of the pile and soil and the pile radius ratio. We demonstrate that the partially embedded piles are much more flexible compared with fully embedded piles when subjected to S‐wave excitation, resulting more strong motion transferred to the superstructures and the existence of seawater will amplify the seismic responses of offshore pipe piles.

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“…The velocity potential of seawater at the interface of the pile and water should satisfy the following continuity conditions 32,40,41 :

\begin{equation}\frac{{\partial {p}_1}}{{\partial r}}| {_{r = {r}_1}} = \frac{{\partial {p}_2}}{{\partial r}}| {_{r = {r}_2}} = {\rho }_w{\omega }^2{u}_{pw}\cos \theta \end{equation}

where

{\rho }_w

is the mass density of the seawater.…”

Section: Formulation and Solutionmentioning

confidence: 99%

Section: Solution Of the Governing Equation Of The Pipe Pilementioning

confidence: 99%

Lateral kinematic response of offshore pipe piles to S‐wave seismic excitation

Zheng

Luo

Luan

2023

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…7,8 However, pile foundations are frequently exposed to dynamic loads, such as traffic loads, seismic loads, and wave loads. 9,10 As sliding occurs at the pile-soil interface, the interaction between soil and pile is a key factor in analyzing pile foundation problems under dynamic loading. 11 Consequently, comprehending the mechanism of soil-pile interaction under cyclic loading is imperative to ensure engineering safety.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous scholars have extensively examined the influence of diverse factors on the characteristics of the soil–pile interface subjected to static loads, including factors such as particle size, moisture content, and temperature 7,8 . However, pile foundations are frequently exposed to dynamic loads, such as traffic loads, seismic loads, and wave loads 9,10 . As sliding occurs at the pile–soil interface, the interaction between soil and pile is a key factor in analyzing pile foundation problems under dynamic loading 11 .…”

Section: Introductionmentioning

confidence: 99%

Analyzing cyclic shear behavior at the sand–rough concrete interface: An experimental and DEM study across varying displacement amplitudes

Zhang,

Liu,

Zeng

et al. 2024

Num Anal Meth Geomechanics

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Pile foundations frequently endure dynamic loads, necessitating an in‐depth examination of the cyclic shear properties at the pile–soil interface. This study involved a series of cyclic direct shear (CDS) tests conducted on sand and concrete with irregular surface, utilizing varying displacement amplitudes (1, 3, 6, and 10 mm) and joint roughness coefficients (0.4, 5.8, 9.5, 12.8, and 16.7). Discrete Element Method (DEM) models, informed by experimental data, facilitated mesoscopic mechanical response analyses. Findings indicate that the sand–concrete interface undergoes softening, with hysteresis loops' morphology dependent largely on displacement amplitude. A maximum ultimate shear stress corresponds to a specific critical surface roughness, while the initial tangent modulus escalates with increased concrete roughness. Volume variations of the specimen inversely correlate with displacement amplitude and directly with surface roughness. As displacement amplitude expands, there is a reduction in the maximum shear stiffness and an elevation in the maximum damping ratio. Empirical formulas for the surface roughness and normalized shear stiffness were proposed. Larger displacement amplitudes result in more substantial shear bands and heightened energy dissipation, yet the incremental energy ratio remains largely unaffected. Predominant energy dissipation mechanisms include both slip and rolling slip, with the former surpassing the latter in energy dissipation capacity. The anisotropy directions of contact normal, normal contact forces, and tangential contact forces consistently fluctuate with shear direction alterations.

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“…With the increasing utilization of land-based resources, people have begun to turn their attention to the oceans and promote the development of offshore drilling rigs, offshore wind turbines, even the wind power generation in deep water environments (Jouffray et al, 2020;He et al, 2022a;He et al, 2022b). As the main deep foundation elements for marine structures, the vibration characteristics of monopiles under mechanical and seismic loads have received detailed investigations in recent years (Chen et al, 2022a;Chen et al, 2022b;Zhang et al, 2022). It should be pointed out that harbor oscillations induced by infragravity waves or transient wave groups (Gao et al, 2017;Gao et al, 2020;Gao et al, 2021) can interrupt the normal operation of docks, cause the extreme movements of moored ships, and even give rise to the break of mooring lines.…”

Section: Introductionmentioning

confidence: 99%

Second-order Stokes wave-induced dynamic response and instantaneous liquefaction in a transversely isotropic and multilayered poroelastic seabed

Zhang

Zhou

et al. 2022

Front. Mar. Sci.

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The ocean waves exhibit obvious non-linearity with asymmetric distribution of wave crests and troughs, which could induce significantly different effect on the seabed compared to the commonly used linear wave theory. In this paper, a semi-analytical solution for a transversely isotropic and multilayered poroelastic seabed under non-linear ocean wave is proposed by virtue of the dual variable and position (DVP) method. The ocean wave and seabed are, respectively, modelled using second-order Stokes theory and Biot’s complete poroelastodynamic theory. Then the established governing equations are decoupled and solved via the powerful scalar potential functions. Making use of the DVP scheme, the layered solutions are finally gained by combining the boundary conditions of the seabed. The developed solutions are verified by comparing with existing solutions. The selected numerical examples are presented to investigate the effect of main parameters on the dynamic response of the seabed and evaluate the corresponding liquefaction potential. The results show that the anisotropic stiffness and permeability, degree of saturation and stratification have remarkable influence on the dynamic response and liquefaction behavior of the seabed. The present solution is a useful tool to estimate the stability of transversely isotropic and layered seabed sediment in the range of non-linear ocean wave.

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Influence of defects on the lateral dynamic characteristics of offshore piles considering hydrodynamic pressure

Cited by 24 publications

References 36 publications

Lateral kinematic response of offshore pipe piles to S‐wave seismic excitation

Lateral kinematic response of offshore pipe piles to S‐wave seismic excitation

Analyzing cyclic shear behavior at the sand–rough concrete interface: An experimental and DEM study across varying displacement amplitudes

Second-order Stokes wave-induced dynamic response and instantaneous liquefaction in a transversely isotropic and multilayered poroelastic seabed

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