Proceedings of the Institution of Civil Engineers-Maritime Engineering最新文献

60MLD Floating Pump Station, Waikato River, New Zealand 60MLD浮动泵站，怀卡托河，新西兰

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-08-23 DOI: 10.1680/jmaen.2022.012

C. Ohl, Chris Shorrock, G. Cameron, Holger Zipfel, Sven Harlos

引用次数: 0

Performance of a novel concept of a monopile adapted with pre-tensioned tethers for intermediate waters 一种新概念的单桩性能，适用于中间水域的预张拉系索

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-06-19 DOI: 10.1680/jmaen.2023.001

Mohd Ishtiyak, A. Sarkar, T. Fazeres-Ferradosa, P. Rosa-Santos, F. Taveira-Pinto, Rui Figueiredo, X. Romão

{"title":"Performance of a novel concept of a monopile adapted with pre-tensioned tethers for intermediate waters","authors":"Mohd Ishtiyak, A. Sarkar, T. Fazeres-Ferradosa, P. Rosa-Santos, F. Taveira-Pinto, Rui Figueiredo, X. Romão","doi":"10.1680/jmaen.2023.001","DOIUrl":"https://doi.org/10.1680/jmaen.2023.001","url":null,"abstract":"Monopiles are the Industry's first choice today to support an Offshore Wind Turbine (OWT) due to the complexities associated with fabrication, transportation, and installation of various foundation solutions. These are, however, considered suitable for water depths up to around 30 to 35 m, beyond which these become massive and complex to handle. Increasing monopiles’ application range without making them too large by adopting some suitable means may significantly impact the rapid growth of OWTs at intermediate water depths (∼50 m), where existing solutions like jackets or concrete gravity foundations involve large capital expenditure. In this paper, a novel approach of utilizing pre-tensioned tethers along with a 6.0 m diameter monopile has been explored for 50 m water depth. Under extreme load case, the stress ratio has been noted to be reduced from 1.17 to 0.44 when the pre-tensioned tethers are used. Similarly, it is found that by adjusting parameters associated with the proposed concept, the fatigue damage can be brought down from a very high value to 0.63 or less. Thus the results show that the proposed approach can open new avenue to bring competitiveness to the cost of offshore wind energy at the intermediate water depths.","PeriodicalId":54575,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Maritime Engineering","volume":"45 6 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77200247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Finite element analysis of a monopile under one-way and two-way lateral cyclic loading 单向和双向横向循环荷载作用下单桩有限元分析

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-04-20 DOI: 10.1680/jmaen.2021.027

D. Nigitha, Deendayal Rathod, K. Krishnanunni

{"title":"Finite element analysis of a monopile under one-way and two-way lateral cyclic loading","authors":"D. Nigitha, Deendayal Rathod, K. Krishnanunni","doi":"10.1680/jmaen.2021.027","DOIUrl":"https://doi.org/10.1680/jmaen.2021.027","url":null,"abstract":"Offshore Wind Turbines (OWT) are usually constructed on a large diameter monopile. These foundations are subjected to lateral loads and overturning moments due to wind and wave action. The lateral loads from a violent wind and waves are cyclic. In this paper, an attempt has been made to examine the influence of embedded length on monopile behaviour using finite element analysis (Plaxis 3D). The centrifuge test carried out on a monopile embedded in sandy soil was used to validate the constituent model. The numerical studies were performed on a 6m diameter monopile by varying the load amplitude and embedded length ratios (L/D = 4, 5, and 6). The monopile was subjected to both one-way and two-way symmetric lateral cyclic loading with an amplitude of 30%, 40%, and 50% of the monotonic ultimate capacity of the pile. The effect of embedded lengths and the load amplitudes on the accumulated displacements and the cyclic stiffness were studied. From the study, it is found that the rate of accumulated displacement increases by a factor of 0.3 to 0.7 when the load amplitude increased from 30% to 50%. Also, the load amplitude was observed to cause a linear increase in the accumulated displacements. The slope of attenuation value was found to be higher for an increase in the L/D ratio from 4 to 5 as compared to 5 to 6.","PeriodicalId":54575,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Maritime Engineering","volume":"14 7","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72396757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Preface: Offshore Structures and Subsea Technologies 前言:海上结构和海底技术

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-04-01 DOI: 10.1680/jmaen.2023.176.2.46

T. Fazeres-Ferradosa, D. Pavlou, S. Siriwardane, N. Adasooriya

引用次数: 1

Risk assessment model of work safety in container dry ports: The adoption of the continuous risk matrix and Fuzzy AHP 集装箱干港安全生产风险评价模型:采用连续风险矩阵和模糊层次分析法

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-03-28 DOI: 10.1680/jmaen.2022.006

W. Hsu, Yuzhi Wei, Chung-Hong Lee, Long Van Hoang, N. Huynh

引用次数: 3

Dynamic response of offshore wind turbine monopile foundation under wind-wave loads 海上风电机组单桩基础在风浪荷载作用下的动力响应

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-03-07 DOI: 10.1680/jmaen.2022.023

Godfred F. Akwaa, Meng Gao

{"title":"Dynamic response of offshore wind turbine monopile foundation under wind-wave loads","authors":"Godfred F. Akwaa, Meng Gao","doi":"10.1680/jmaen.2022.023","DOIUrl":"https://doi.org/10.1680/jmaen.2022.023","url":null,"abstract":"Physical experiments provide the best representation of foundation behaviour in any environmental conditions offshore, however they are very costly, especially since the on-site conditions vary. Hence it is not a cost-effective approach. On the other hand, numerical modelling is relatively cheaper, but requires long computation time and a high level of expertise to perform a successful numerical calculation. The main objective of this paper is to develop a simple and fast response analysis that requires less computational time and expertise. First, an analytical model is developed to study the dynamic behaviour of the pile by extending the beam on an elastic foundation. Second, the analytical results are verified by using the finite element software Abaqus. Finally, a parametric study is performed with the established numerical calculation model to investigate the modal shapes of the pile model, limit states of the OWT and pile capacity for different loading conditions and aspect ratios. The proposed analytical model demonstrated a degree of error less than 10%, indicating great reliability and practical application. The parametric results indicate that the OWT is more likely to fail by yielding than buckling and the soil resistance at the pile periphery is highly affected by the aspect ratio.","PeriodicalId":54575,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Maritime Engineering","volume":"26 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73913277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An efficient random forest-based subset simulation method for reliability analysis of the marine structure piles subject to scour 基于随机森林的海洋结构桩冲刷可靠性分析方法

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-02-27 DOI: 10.1680/jmaen.2022.020

Arash Vatani, Jafar Jafari-Asl, Sima Ohadi, N. S. Hamzehkolaei, Sanaz Afzali Ahmadabadi, J. Correia

{"title":"An efficient random forest-based subset simulation method for reliability analysis of the marine structure piles subject to scour","authors":"Arash Vatani, Jafar Jafari-Asl, Sima Ohadi, N. S. Hamzehkolaei, Sanaz Afzali Ahmadabadi, J. Correia","doi":"10.1680/jmaen.2022.020","DOIUrl":"https://doi.org/10.1680/jmaen.2022.020","url":null,"abstract":"This study proposes a hybrid random forest-based subset simulation (RFSS) method for probabilistic assessment of the scour around pile groups under waves. In the RFSS, random forest (RF) is employed to replace the true limit state function, and it is updated based on the design samples in the first and last levels of subset simulation (SS) method. In this regard, 127 laboratory datasets collected from the literature were used to modeling. First, an existing equation for predicting the scour depth around piles was modified by using a metaheuristic approach. The performance of the modified equation was compared with four equations and two artificial intelligence (AI) models. The comparisons demonstrated that modified equation more accuracy than existing formulas and previous AI-based models. Then, a probabilistic model based on the RFSS was developed by considering the modified formula as the limit state function of scour depth. Solving two numerical, one hydraulic engineering, and scour of piles group problems, validate the robustness and accuracy of the developed structural reliability method. Results showed that the novel proposed RFSS is a robust and efficient method for solving high-dimensional real-world problems. Furthermore, compared to the Monte Carlo Simulation (MCS), the RFSS enable to estimate the reliability index with fewer computational cost and same accuracy. The function call number of RFSS was obtained 160 at the first example, 100 at the second example, 100 at the hydraulic example, and 150 at the scour of piles example.","PeriodicalId":54575,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Maritime Engineering","volume":"10 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72709018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

State of the art in structural health monitoring of offshore and marine structures 近海和海洋结构健康监测技术现状

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-01-25 DOI: 10.1680/jmaen.2022.027

H. Pezeshki, H. Adeli, D. Pavlou, S. Siriwardane

{"title":"State of the art in structural health monitoring of offshore and marine structures","authors":"H. Pezeshki, H. Adeli, D. Pavlou, S. Siriwardane","doi":"10.1680/jmaen.2022.027","DOIUrl":"https://doi.org/10.1680/jmaen.2022.027","url":null,"abstract":"The present paper deals with state of the art in Structural Health Monitoring (SHM) methods in offshore and marine structures. Most of the SHM methods have been developed for onshore infrastructures. Few works are available to implement SHM technologies in offshore and marine structures. This paper aims to fill this gap and highlight the challenges in implementing SHM methods in offshore and marine structures. The present work categorizes the available techniques for establishing SHM models in oil rigs, offshore wind turbine structures, subsea systems, vessels, pipelines etc. Besides, the capabilities of the proposed ideas in the recent publications are classified into three main categories: a) the Model-Based, b) the Vibration-Based, and c) the Digital Twin methods. Recently developed novel signal processing and machine learning algorithms have been reviewed, and their abilities have been discussed. Developed methods in Vision-Based and Population-Based approaches have also been presented and discussed. The present paper aims to provide a guideline for selecting and establishing SHM in offshore and marine structures.","PeriodicalId":54575,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Maritime Engineering","volume":"85 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86679177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Computer-aided design of offshore S-lay FRP pipeline installation: An open code Part I: Bending stresses 海上s层玻璃钢管道安装的计算机辅助设计。开放规范第1部分:弯曲应力

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-01-09 DOI: 10.1680/jmaen.2022.025

D. Pavlou

引用次数: 0

Dynamic instability mechanisms of offshore pipelines and risers 海上管道及立管的动力失稳机理

IF 2.7 3区工程技术

Proceedings of the Institution of Civil Engineers-Maritime Engineering Pub Date : 2023-01-09 DOI: 10.1680/jmaen.2022.026

D. Pavlou

引用次数: 0