Comparative study of seismic response of offshore tetrapod jacket systems with semi-rigid and flexible piles under environmental loads

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering Pub Date : 2024-11-12 DOI:10.1016/j.oceaneng.2024.119716

Yikang Wang , Chen Wang , Hao Zhang , Fayun Liang , Zhouchi Yuan

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引用次数: 0

Abstract

Tetrapod piled jacket (TPJ) foundations, featuring large-diameter semi-rigid piles have been employed to support offshore wind turbines (OWTs), but limited research exists on their dynamic response under seismic excitations in marine environments. Thus, this study employs advanced 3D finite element simulations to analyze and compare the seismic responses of flexible and semi-rigid piled TPJ systems under combined dynamic loads. Under seismic loads, the semi-rigid piled system experience higher compressive stress on the tower but lower maximum stress at X-brace and battered leg joints compared to flexible piled systems. Additionally, soil shear strain in the semi-rigid pile system displays a punch-through failure pattern at the pile end. The impacts of increasing scour depth and clay shear strength on semi-rigid-piled systems are distinctly characterized by greater pile top settlement, augmented bending moment responses, and diminished rotational deformation, compared to those of flexible ones. These findings offer valuable insights into semi-rigid-piled TPJ system dynamic response in complex marine environments.

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带半刚性桩和柔性桩的近海四柱护套系统在环境荷载作用下的地震响应对比研究

以大直径半刚性桩为特点的四柱桩套（TPJ）地基已被用于支撑海上风力涡轮机（OWT），但有关其在海洋环境地震激励下的动态响应的研究却十分有限。因此，本研究采用先进的三维有限元模拟，分析和比较了柔性和半刚性桩 TPJ 系统在组合动荷载下的地震响应。与柔性桩基系统相比，在地震荷载作用下，半刚性桩基系统的塔身受到的压应力更大，但在 X 支撑和撞击腿连接处受到的最大应力较小。此外，半刚性桩系统的土壤剪切应变在桩端显示出一种冲穿破坏模式。与柔性桩系统相比，增加冲刷深度和粘土剪切强度对半刚性桩系统的影响表现为桩顶沉降增大、弯矩响应增强和旋转变形减小。这些发现为半刚性桩TPJ系统在复杂海洋环境中的动态响应提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ocean Engineering 工程技术-工程：大洋

CiteScore

7.30

自引率

34.00%

发文量

2379

审稿时长

8.1 months

期刊介绍： Ocean Engineering provides a medium for the publication of original research and development work in the field of ocean engineering. Ocean Engineering seeks papers in the following topics.