Wave Loads on Offshore Structure

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (5 January 2024) | Viewed by 3269

Special Issue Editors


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Guest Editor
Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing, China
Interests: offshore structure seismic; fluid–structure interaction; pile-soil interaction
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Guest Editor
Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Interests: bridge engineering; bridge hydrodynamics; nonlinear structural analysis; fluid–structure interaction; risk assessment of coastal hazards
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The ocean is rich in resources, such as oil, gas, wave power, and wind power. The development of these resources heavily relies on different types of offshore structures, including various platforms, fixed or floating structures. In addition, the development of coastal cities also demands the construction of more sea-crossing transportation structures, including underwater tunnels, sea bridges and breakwaters. These offshore structures face challenges in the complex ocean environment, where the impact of waves and currents remains a primary factor leading to structural damage. Despite numerous studies on wave and current loads, the field still presents many unresolved issues and remains one of the most important topics in ocean engineering. Further research would deepen our understanding of hydrodynamic loads, enabling better guidance for engineering applications and enhancing the safety design and operation of offshore structures.

Thus, this Special Issue aims to highlight recent advances in wave and current loads on offshore structures, the dynamics of these structures under such loads and the corresponding vibration mitigation methods.

Prof. Dr. Piguang Wang
Prof. Dr. Kai Wei
Guest Editors

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Published Papers (3 papers)

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Research

23 pages, 25204 KiB  
Article
Failure Behavior and Surrounding Soil Stress Responses of Suction Anchor in Low-Strength Muddy Clay
by Jiwei Luo, Xiaoqiang Liu, Xianpeng Liu, Dianjun Zuo, Xiaoyu An and Liqiang Yu
J. Mar. Sci. Eng. 2023, 11(11), 2190; https://doi.org/10.3390/jmse11112190 - 17 Nov 2023
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Abstract
Anchorage failure of a suction anchor is more likely to occur in low-strength muddy clay. This paper focuses on the failure behaviors of suction anchors and muddy clay stress responses. The centrifugal model test was used to study the loading processes of suction [...] Read more.
Anchorage failure of a suction anchor is more likely to occur in low-strength muddy clay. This paper focuses on the failure behaviors of suction anchors and muddy clay stress responses. The centrifugal model test was used to study the loading processes of suction anchors with various pulling angles. Firstly, the multi-stage developing process of anchoring force was analyzed according to the test results. Numerical modeling was used to validate the test results. The displacement of the suction anchor and muddy clay soil were analyzed using the numerical results. Then, the numerical and testing results were compared to analyze the horizontal soil pressure responses around the suction anchors. It was found that the change in loading direction affected the distribution and development of soil stress. The horizontal soil resistance played a crucial role in improving the bearing capacity. The soil stress variation and anchor displacement revealed that the suction anchors exhibited multi-attitude coupling movement during the inclined pulling. The vertical pulling suction anchor showed shear–slip failure behaviors, while the inclined pulling suction anchors showed compression–shear–slip coupling failure behaviors. The results of this study provide insight into the interaction mechanism between suction anchors and muddy clay, serving as a reference for the design and application of suction anchors. Full article
(This article belongs to the Special Issue Wave Loads on Offshore Structure)
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25 pages, 7142 KiB  
Article
Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines
by Yongqing Lai, Wei Li, Ben He, Gen Xiong, Renqiang Xi and Piguang Wang
J. Mar. Sci. Eng. 2023, 11(11), 2041; https://doi.org/10.3390/jmse11112041 - 24 Oct 2023
Viewed by 943
Abstract
At present, monopile-supported offshore wind turbines (MOWTs) are widely used in offshore wind farms. The influence of blade flexibility on the dynamic behaviors of MOWTs excited by waves and earthquakes was investigated in this study. Numerical analysis models were established for 5 MW [...] Read more.
At present, monopile-supported offshore wind turbines (MOWTs) are widely used in offshore wind farms. The influence of blade flexibility on the dynamic behaviors of MOWTs excited by waves and earthquakes was investigated in this study. Numerical analysis models were established for 5 MW and 10 MW MOWTs, incorporating flexible and rigid blade configurations. The modes and natural frequencies of the full system were compared between these two numerical models, and their dynamic responses were evaluated under wave-only and earthquake-only excitations. It was revealed that the influence of blade flexibility on the first- and second-order modes of the system can be neglected. The dynamic response of these MOWTs under wave excitation can be predicted by the rigid blade model, where the maximum relative difference is less than 5%. However, higher-order modes of the system are significantly affected by the blade flexibility. Under high-frequency excitations, these higher-order modes of the system are remarkably stimulated. Additionally, a large relative difference, exceeding 50%, is detected when the rigid blade model is used to predict the seismic response of the two MOWTs. Consequently, the blade flexibility should be adequately modeled when predicting the dynamic response of OWTs. Full article
(This article belongs to the Special Issue Wave Loads on Offshore Structure)
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24 pages, 8498 KiB  
Article
Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead
by Jinduo Wang, Yanbin Wang, Deli Gao, Rui Li and Liurui Guo
J. Mar. Sci. Eng. 2023, 11(10), 1959; https://doi.org/10.3390/jmse11101959 - 11 Oct 2023
Viewed by 896
Abstract
During deepwater drilling, the subsea wellhead will be subjected to dynamic loads transmitted from the marine environment, floating drilling platform, riser, and blowout preventer (BOP). Therefore, complex dynamic responses will be induced, which will seriously affect the safety of the subsea wellhead. In [...] Read more.
During deepwater drilling, the subsea wellhead will be subjected to dynamic loads transmitted from the marine environment, floating drilling platform, riser, and blowout preventer (BOP). Therefore, complex dynamic responses will be induced, which will seriously affect the safety of the subsea wellhead. In this paper, considering the effect of auxiliary pipelines on the riser, a novel entire mechanical model of the floating platform–riser–BOP–subsea wellhead is established. By using the finite-difference method, the governing equations are solved. Finally, the dynamic bending moment and stress distribution of the subsea wellhead are obtained. Moreover, the model is verified by numerical simulation in Orcaflex. On this basis, the influence of the wave height, wave period, sludge height of the subsea wellhead, rotational stiffness of the lower flexible joint, and wall thickness of the conductor on the dynamic characteristics of the subsea wellhead is discussed. Analysis results show that the theoretical analysis results are in good agreement with the numerical simulation. The auxiliary pipelines have important influence on the dynamic characteristics of the subsea wellhead. Wave period is the most important factor affecting the mechanical behavior of the subsea wellhead. Wave height, wall thickness of the conductor, and sludge height are secondary factors affecting the mechanical behavior of the subsea wellhead. The rotational stiffness of the lower flexible joint has little influence on the mechanical behavior of the subsea wellhead. By solving the optimized mechanical model proposed in this paper, the dynamic characteristic of the subsea wellhead conforms more to the actual deepwater drilling conditions. This study has reference significance for the design and mechanical control of the subsea wellhead in deepwater drilling. Full article
(This article belongs to the Special Issue Wave Loads on Offshore Structure)
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