Variation in Stiffness of Monopiles in Dense Sand Under Cyclic Lateral Loads

Nicolai, Giulio; Ibsen, Lars Bo

doi:10.17736/jowe.2016.jcr37

Cited by 2 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The auth noted that the cumulative deformation of the pile foundation continued to increase der horizontal cyclic loading, which exhibited a linear correlation with the cyclic load tio, soil compactness, and the number of cycles. Similar studies were conducted Cuéllar et al [5], Nicolai and Ibsen [6], Chen et al [7], Takahashi et al [8], and Wang al. [9].…”

Section: Introductionsupporting

confidence: 77%

“…The authors noted that the cumulative deformation of the pile foundation continued to increase under horizontal cyclic loading, which exhibited a linear correlation with the cyclic load ratio, soil compactness, and the number of cycles. Similar studies were conducted by Cuéllar et al [5], Nicolai and Ibsen [6], Chen et al [7], Takahashi et al [8], and Wang Y et al [9]. These papers studied the development of cumulative deformation in pile foundations under horizontal cyclic load, but they did not investigate the changes in soil resistance around the pile or the variations in vertical bearing capacity.…”

Section: Introductionmentioning

confidence: 82%

See 1 more Smart Citation

Influence of Horizontal Loading in Changing the Ultimate Uplift Bearing Capacity of Monopile Foundation of Offshore Wind Turbine

Sun

Wang

Dou

et al. 2023

JMSE

View full text Add to dashboard Cite

Throughout their lifespan, monopile foundations supporting offshore wind turbines inevitably experience horizontal loads from waves, winds, and currents, resulting in cumulative deformation. It has been believed that deformation caused by horizontal loading weakens the interaction between the pile and the soil, leading to a reduction in the ultimate uplift bearing capacity of the pile foundation. However, there is a scarcity of literature investigating this issue, particularly regarding monopiles used in offshore wind turbine installations. Therefore, this study aims to explore the impact of horizontal cyclic loads on the ultimate uplift bearing capacity of monopile, focusing on the pile–soil interaction. To achieve this, a series of 1 g model tests were conducted on a rigid model pile embedded in silt with varying relative compaction. The test results indicate that the ultimate uplift bearing capacity of the pile is significantly diminished after experiencing horizontal cyclic loading, and the extent of reduction is closely linked to the amplitude of the horizontal deformation. A semi-empirical model is developed to predict the ultimate uplift bearing capacity of the pile foundation following horizontal cyclic loading. The key findings of this study are as follows: (1) The earth pressure in the active zone gradually decreases with an increasing number of cycles, while the earth pressure in the passive zone experiences a slight increase under horizontal cyclic loading. (2) The position of the pile rotation center under horizontal cyclic loading is approximately 0.84 times the depth at which the pile is buried, and this relationship appears to be independent of soil density and cyclic load ratio. (3) The variation of earth pressure corresponding to the horizontal deformation of the pile in the active zone can be divided into three phases: a rapid decline phase, a slow decline phase, and a stable phase. (4) The reduction in the ultimate uplift capacity is influenced by the cyclic ratio and number of cycles but does not appear to have a significant relationship with soil density.

show abstract