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Artykuły w czasopismach na temat „Offshore structures – Foundations”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 21 lutego 2023

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1

Yang, Ray-Yeng, Hsin-Hung Chen, Hwung-Hweng Hwung, Wen-Pin Jiang, and Nian-Tzu Wu. "EXPERIMENTAL STUDY ON THE LOADING AND SCOUR OF THE JACKET TYPE OFFSHORE WIND TURBINE FOUNDATION." Coastal Engineering Proceedings 1, no. 32 (January 21, 2011): 25. http://dx.doi.org/10.9753/icce.v32.structures.25.

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A 1:36 scale model tests were carried out in the Medium Wave Flume (MWF) and Near-shore Wave Basin (NSWB) at the Tainan Hydraulics Laboratory (THL) with the jacket type offshore wind turbine foundation located in the test area. The loading of typhoon wave with current on the jacket type offshore wind turbine foundation was investigated in the MWF with fixed bed experiment. Meanwhile, the scour around the jacket type offshore wind turbine foundation exposed to wave and current was conducted in the NSWB with the moveable bed experiment. Two locations (water depth 12m and 16m) of the foundations

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2

Schneider, James A., and Marc Senders. "Foundation Design: A Comparison of Oil and Gas Platforms with Offshore Wind Turbines." Marine Technology Society Journal 44, no. 1 (January 1, 2010): 32–51. http://dx.doi.org/10.4031/mtsj.44.1.5.

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AbstractThe offshore oil and gas (O&G) industry has over 70 years of experience developing innovative structures and foundation concepts for engineering in the marine environment. The evolution of these structures has strongly been influenced by water depth as well as soil conditions in the area of initial developments. As the offshore wind industry expands from the glacial soil deposits of the North and Baltic Seas, experience from the O&G industry can be used to aid a smooth transition to new areas. This paper presents an introduction to issues that influence how design and construct

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Been, K., J. I. Clark, and W. R. Livingstone. "Verification and calibration studies for the new CAN/CSA-S472 foundations of offshore structures." Canadian Geotechnical Journal 30, no. 3 (June 1, 1993): 515–25. http://dx.doi.org/10.1139/t93-044.

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In June 1992, the Canadian Standards Association (CSA) published a code for the design, construction, and installation of fixed offshore structures. This code is relatively advanced in its application of limit states design to offshore structures. The part dealing with foundations is written as a performance standard. It does not specify resistance factors (or safety factors) to achieve the target reliability of the structure. Although limit states design is common practice among geotechnical engineers, the application of resistance factors is a problem. This paper describes some of the studie

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Gao, Feng, Clive Mingham, and Derek Causon. "SIMULATION OF EXTREME WAVE INTERACTION WITH MONOPILE MOUNTS FOR OFFSHORE WIND TURBINES." Coastal Engineering Proceedings 1, no. 33 (October 15, 2012): 22. http://dx.doi.org/10.9753/icce.v33.structures.22.

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Extreme wave run-up and impacts on monopile foundations may cause unexpected damage to offshore wind farm facilities and platforms. To assess the forces due to wave run-up, the distribution of run-up around the pile and the maximum wave run-up height need to be known. This paper describes a numerical model AMAZON-3D study of wave run-up and wave forces on offshore wind turbine monopile foundations, including both regular and irregular waves. Numerical results of wave force for regular waves are in good agreement with experimental measurement and theoretical results, while the maximum run-up he

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5

Esteban, M., José-Santos López-Gutiérrez, and Vicente Negro. "Gravity-Based Foundations in the Offshore Wind Sector." Journal of Marine Science and Engineering 7, no. 3 (March 12, 2019): 64. http://dx.doi.org/10.3390/jmse7030064.

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In recent years, the offshore wind industry has seen an important boost that is expected to continue in the coming years. In order for the offshore wind industry to achieve adequate development, it is essential to solve some existing uncertainties, some of which relate to foundations. These foundations are important for this type of project. As foundations represent approximately 35% of the total cost of an offshore wind project, it is essential that they receive special attention. There are different types of foundations that are used in the offshore wind industry. The most common types are s

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Barari, Amin, and Lars Bo Ibsen. "VERTICAL CAPACITY OF BUCKET FOUNDATIONS IN UNDRAINED SOIL." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 20, no. 3 (March 10, 2014): 360–71. http://dx.doi.org/10.3846/13923730.2013.801915.

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Offshore wind turbine structures are traditionally founded on gravity concrete foundations or mono-piles. Bucket foundations were developed for the offshore oil and gas industry and are now being used in wind turbine construction. The loading in this application is characterized by a vertical load due to the slender construction combined with horizontal forces inducing a large overturning moment. Field tests on bucket foundations were performed to gain insight into the vertical load response of bucket foundations in clay soils. The field tests were accompanied by finite element numerical simul

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7

Sánchez, Sergio, José-Santos López-Gutiérrez, Vicente Negro, and M. Dolores Esteban. "Foundations in Offshore Wind Farms: Evolution, Characteristics and Range of Use. Analysis of Main Dimensional Parameters in Monopile Foundations." Journal of Marine Science and Engineering 7, no. 12 (December 2, 2019): 441. http://dx.doi.org/10.3390/jmse7120441.

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Renewable energies are the future, and offshore wind is undoubtedly one of the renewable energy sources for the future. Foundations of offshore wind turbines are essential for its right development. There are several types: monopiles, gravity-based structures, jackets, tripods, floating support, etc., being the first ones that are most used up to now. This manuscript begins with a review of the offshore wind power installed around the world and the exposition of the different types of foundations in the industry. For that, a database has been created, and all the data are being processed to be

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8

Zografou, Dimitra, Susan Gourvenec, and Conleth O’Loughlin. "Vertical cyclic loading response of shallow skirted foundation in soft normally consolidated clay." Canadian Geotechnical Journal 56, no. 4 (April 2019): 473–83. http://dx.doi.org/10.1139/cgj-2018-0179.

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Skirted foundations are a potential foundation solution for a range of offshore structures, including hydrocarbon and renewable energy platforms and subsea structures. Offshore foundations can be subject to cyclic loading from environmental, installation, and operational events affecting the geotechnical response. A series of centrifuge tests have been performed on a shallow skirted foundation on normally consolidated kaolin clay under a range of vertical cyclic load sequences to investigate the effect of tensile or compressive average stress, the magnitude of the applied stress, and the effec

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9

Manzano-Agugliaro, Francisco, Miguel Sánchez-Calero, Alfredo Alcayde, Carlos San-Antonio-Gómez, Alberto-Jesús Perea-Moreno, and Esther Salmeron-Manzano. "Wind Turbines Offshore Foundations and Connections to Grid." Inventions 5, no. 1 (January 28, 2020): 8. http://dx.doi.org/10.3390/inventions5010008.

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Most offshore wind farms built thus far are based on waters below 30 m deep, either using big diameter steel monopiles or a gravity base. Now, offshore windfarms are starting to be installed in deeper waters and the use of these structures—used for oil and gas like jackets and tripods—is becoming more competitive. Setting aside these calls for direct or fixed foundations, and thinking of water depths beyond 50 m, there is a completely new line of investigation focused on the usage of floating structures; TLP (tension leg platform), Spar (large deep craft cylindrical floating caisson), and semi

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10

Stahlmann, Arne, and Torsten Schlurmann. "PHYSICAL MODELING OF SCOUR AROUND TRIPOD FOUNDATION STRUCTURES FOR OFFSHORE WIND ENERGY CONVERTERS." Coastal Engineering Proceedings 1, no. 32 (January 27, 2011): 67. http://dx.doi.org/10.9753/icce.v32.sediment.67.

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As a step to further develop the share of renewable energies, the first German offshore test site alpha ventus has been installed in the North Sea in 2009 in water depths of 30 m, where experience shall be gained and made available for future offshore wind farms. Regarding converter foundations in deep water, it is well known that in most cases scour phenomena occur around the structures. Due to the complexity of the tripod foundations, significant knowledge gaps in scour progression in general and especially in detail as well as its probable effects on the stability and durability are g

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11

Meyerhof, Geoffrey G. "Development of geotechnical limit state design." Canadian Geotechnical Journal 32, no. 1 (February 1, 1995): 128–36. http://dx.doi.org/10.1139/t95-010.

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The historical development of limit state design in geotechnical engineering is reviewed. Total and partial factors of safety used for the design of land–based and offshore structures are compared. It is found that the factors of safety in different codes for the ultimate and serviceability limit states design of earthworks, earth retaining structures, and land-based and offshore foundations are very similar. Partial factors in the ultimate limit state design are linked to the variability of the loads and soil parameters, the design approximations, and construction tolerances. They influence t

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12

Stahlmann, Arne, and Torsten Schlurmann. "INVESTIGATIONS ON SCOUR DEVELOPMENT AT TRIPOD FOUNDATIONS FOR OFFSHORE WIND TURBINES: MODELING AND APPLICATION." Coastal Engineering Proceedings 1, no. 33 (October 25, 2012): 90. http://dx.doi.org/10.9753/icce.v33.sediment.90.

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Regarding offshore constructions, there is still a lack in knowledge of scour progression for complex structures like foundations for offshore wind energy converters at present, which is however necessary for its dimensioning. As an example of such complex structure types, tripod foundations are constructed in German offshore wind farms at present. In order to describe physical processes and influencing factors on scour progression from a scientific point of view, comprehensive investigations on the scouring phenomena for tripod foundations have been carried out and will be partly presented he

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13

Davidson, Alasdair, and Jasmin Semlitsch. "‘Solid foundations’: the advantages of using Guernsey Foundations for building a family office." Trusts & Trustees 25, no. 6 (July 1, 2019): 668–72. http://dx.doi.org/10.1093/tandt/ttz052.

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Abstract Family office services are gaining ever-increasing popularity and traction across the global offshore financial centres. The key characteristics and distinctions of Guernsey’s foundation regime make it a particularly effective tool for wealthy individuals and their dedicated family offices to achieve an array of investment, succession planning, or philanthropic objectives. In this article, we explore how Guernsey foundations can cater for the desired levels of control, tailor the rights of beneficiaries, maintain confidentiality, and be used in new and innovative ways to enhance and c

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14

Vieira, Mário, Miguel Viana, Elsa Henriques, and Luís Reis. "Soil Interaction and Grout Behavior for the NREL Reference Monopile Offshore Wind Turbine." Journal of Marine Science and Engineering 8, no. 4 (April 24, 2020): 298. http://dx.doi.org/10.3390/jmse8040298.

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Monopiles for offshore wind are the most used foundations by farm operators due to their low production costs, when compared to other bottom-fixed or floating foundations. In this research, a monopile foundation for offshore wind power was evaluated for its soil interaction and grout behavior, and an appropriate numerical model for the structural analysis of the foundation and tower was developed. FAST 8, an aero-hydro-servo-elastic numerical code developed by NREL, was used to obtain the loads applied on the supporting structures. These loads were pre-processed before they were inputted on th

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15

Andersson, Mathias H., and Marcus C. Öhman. "Fish and sessile assemblages associated with wind-turbine constructions in the Baltic Sea." Marine and Freshwater Research 61, no. 6 (2010): 642. http://dx.doi.org/10.1071/mf09117.

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Offshore wind farms are being built at a high rate around the world to meet the demand for renewable energy. We studied fish and sessile communities on and around offshore wind-turbine foundations in the southern Baltic Sea, 7 years after construction, using visual census techniques to determine how fish, sessile-invertebrate and algal communities are affected by the introduction of such structures. Fish assemblages were dominated by two-spotted gobies (Gobiusculus flavescens) that were found in large shoals in close association with the vertical surface. At the seabed, close to the foundation

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16

Aliyeva, Sevda, and Mahmud Ismayilov. "RESEARCH OF THE WAVE FACTOR INFLUENCING HYDRAULIC STRUCTURES." ETM - Equipment, Technologies, Materials 05, no. 01 (January 20, 2021): 81. http://dx.doi.org/10.36962/etm0501202081.

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It is known that a large block of deep-sea foundations consists of a truss sheathed with wood, a metal beam system, floating structures and four pyramidal metal blocks with a truss structure. The design characteristics of the foundations of oil platforms depend on the conditions under which the vertical interaction, along with the calculation of permanent and temporary loads, is accompanied by the specific gravity of drilling equipment and rigs or horizontal wind pressure, as well as the influence of horizontal wave loads on the foundation blocks. Horizontal waves and wind loads can be constan

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17

Arshad, Muhammad, and Brendan C. O'Kelly. "Analysis and Design of Monopile Foundations for Offshore Wind-Turbine Structures." Marine Georesources & Geotechnology 34, no. 6 (July 28, 2015): 503–25. http://dx.doi.org/10.1080/1064119x.2015.1033070.

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Shin, Yunsup, Thomas Langford, Kyunghwan Cho, Jongheon Park, and Junyoung Ko. "Applicability of Concrete–Steel Composite Piles for Offshore Wind Foundations." Energies 14, no. 16 (August 6, 2021): 4794. http://dx.doi.org/10.3390/en14164794.

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Offshore wind-turbine support structures are largely made of steel since steel monopiles have accounted for the majority of installations in the last decade. As turbines become bigger, steel structures have led to an exponential increase in material and installation costs. From this point of view, the use of concrete for future support structures has been initiated. In this study, concrete–steel composite piles have been investigated. A pre-tensioned high strength concrete pile was placed in the lower part, mainly to support the axial load, and a steel pile in the upper part to resist the late

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19

Alati, Natale, Giuseppe Failla, and Felice Arena. "Seismic analysis of offshore wind turbines on bottom-fixed support structures." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2035 (February 28, 2015): 20140086. http://dx.doi.org/10.1098/rsta.2014.0086.

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This study investigates the seismic response of a horizontal axis wind turbine on two bottom-fixed support structures for transitional water depths (30–60 m), a tripod and a jacket, both resting on pile foundations. Fully coupled, nonlinear time-domain simulations on full system models are carried out under combined wind–wave–earthquake loadings, for different load cases, considering fixed and flexible foundation models. It is shown that earthquake loading may cause a significant increase of stress resultant demands, even for moderate peak ground accelerations, and that fully coupled nonlinear

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20

Byrne, B. W., and G. T. Houlsby. "Helical piles: an innovative foundation design option for offshore wind turbines." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2035 (February 28, 2015): 20140081. http://dx.doi.org/10.1098/rsta.2014.0081.

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Offshore wind turbines play a key part in the renewable energy strategy in the UK and Europe as well as in other parts of the world (for example, China). The majority of current developments, certainly in UK waters, have taken place in relatively shallow water and close to shore. This limits the scale of the engineering to relatively simple structures, such as those using monopile foundations, and these have been the most common design to date, in UK waters. However, as larger turbines are designed, or they are placed in deeper water, it will be necessary to use multi-footing structures such a

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Lin, Yung-Bin, Tzu-Kang Lin, Cheng-Chun Chang, Chang-Wei Huang, Ben-Ting Chen, Jihn-Sung Lai, and Kuo-Chun Chang. "Visible Light Communication System for Offshore Wind Turbine Foundation Scour Early Warning Monitoring." Water 11, no. 7 (July 17, 2019): 1486. http://dx.doi.org/10.3390/w11071486.

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Offshore wind farms have a superior wind source to terrestrial wind farms, but they also face more severe environmental conditions such as severe storms, typhoons, and sea waves. Scour leads to the excavation of sediments around the foundations of structures, reducing the safe capacity of the structures. The phenomenon of pier scour is extremely complex because of the combined effects of the vortex system involving time-dependent flow patterns and sediment transport mechanisms. A real-time scour monitoring system can improve the safety of structures and afford cost-effective operations by prev

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Ye, Hailin, Feng Zu, Chuwei Jiang, Wenjing Bai, and Yaojiang Fan. "Experimental Investigation of the Coupling Effect of Jackup Offshore Platforms, Towers, and Seabed Foundations under Waves of Large Wave Height." Water 15, no. 1 (December 21, 2022): 24. http://dx.doi.org/10.3390/w15010024.

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A large number of jackup offshore platforms with towers are widely applied in ocean engineering. The dynamic response of the platforms to waves of large wave height is critical, as such waves may cause platform accidents, property damage, and casualties. Therefore, it is important to investigate the coupling effect of jackup offshore platform, towers and seabed foundations under waves of large wave height. In this study, the coupling effect of offshore platforms, tower structures, and seabed foundations under the impact of waves of large wave height was studied via a physical flume model test.

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Basack, Sudip, and Abhik Kumar Banerjee. "Offshore Pile Foundation Subjected to Lateral Cyclic Load in Layered Soil." Advanced Materials Research 891-892 (March 2014): 24–29. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.24.

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The pile foundations supporting offshore structures are required to be designed against cyclic load, moments and torques initiated by a combined action of waves, wind, tides, currents, etc. Such a complex loading condition produces progressive degradation in the pile-soil interactive performance which is likely to introduce significant reduction in bearing capacity with increased settlement and displacements. This paper is based on a numerical model developed by the Authors to study the response of pile foundation under lateral cyclic load in layered soil. The model is validated with a field t

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Fazeres-Ferradosa, Taveira-Pinto, Rosa-Santos, and Chambel. "Probabilistic Comparison of Static and Dynamic Failure Criteria of Scour Protections." Journal of Marine Science and Engineering 7, no. 11 (November 7, 2019): 400. http://dx.doi.org/10.3390/jmse7110400.

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The present paper provides a reliability assessment of scour protections applicable to both the static and dynamic stability design. As a case study, Horns Rev 3 hindcast data is used to simulate different failure criteria for an exemplary scour protection suitable for an offshore monopile foundation. The results show that the probability of failure is influenced by several factors, namely the wave friction factor, the definition of the acceptable damage number or the formulations used to calculate the bed shear-stress. The reliability assessment also indicates that annual probabilities of fai

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Ye, Hailin, Dawei Yu, Jianhong Ye, and Zhiwen Yang. "Numerical Analysis of Dynamics of Jack-Up Offshore Platform and Its Seabed Foundation under Ocean Wave." Applied Sciences 12, no. 7 (March 24, 2022): 3299. http://dx.doi.org/10.3390/app12073299.

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Jack-up offshore platform is a type of important marine structure, which is mainly used for satellite launch, oil exploitation, and other engineering tasks in the offshore area. The offshore platform is bound to be subjected to wave loading in the course of use. Whether it can withstand the wave impact is an important engineering problem. To solve this engineering problem, the self-developed fluid–structure–foundation interaction coupling model OlaFlow-ABAQUS is used to explore the dynamic response characteristics of a jack-up offshore platform and its seabed foundation under three conventiona

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Andresen, Lars, Hans Petter Jostad, and Knut H. Andersen. "Finite Element Analyses Applied in Design of Foundations and Anchors for Offshore Structures." International Journal of Geomechanics 11, no. 6 (December 2011): 417–30. http://dx.doi.org/10.1061/(asce)gm.1943-5622.0000020.

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Negro, Vicente, José-Santos López-Gutiérrez, M. Dolores Esteban, and Clara Matutano. "Uncertainties in the design of support structures and foundations for offshore wind turbines." Renewable Energy 63 (March 2014): 125–32. http://dx.doi.org/10.1016/j.renene.2013.08.041.

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Nasab, Navid Majdi, Jeff Kilby, and Leila Bakhtiaryfard. "Analysis and Design of Monopile Foundations for Offshore Wind and Tidal Turbine Structures." Water 14, no. 21 (November 5, 2022): 3555. http://dx.doi.org/10.3390/w14213555.

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This paper aims to design an integrated offshore structure capable of supporting a hybrid assembly of one wind plus two tidal turbines. The monopile has been found to be a suitable foundation type as the most inexpensive solution in water depths of less than 30 m. The Cook Strait in New Zealand is an ideal location for wind and tidal renewable energy sources due to its strong winds and tidal currents. Finite element analysis was performed to determine the displacement of the structure for different types of soils using OPTUM G3. After that, a macro-element model for soil was represented, consi

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Srokosz, Piotr, Ireneusz Dyka, and Marcin Bujko. "Determination of Shear Modulus of Soil in the RC/TS Apparatus for Designing Offshore Wind Power Plant Foundations." Polish Maritime Research 25, no. 3 (September 1, 2018): 69–83. http://dx.doi.org/10.2478/pomr-2018-0098.

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Abstract The paper presents a selected aspect of the determining the initial soil shear modulus value on the research example in resonant column – torsional shear apparatus (RC / TS). There are presented the significance of the initial value of shear modulus in design of offshore wind power plant foundations and the importance of its variability in the function of cyclical shear strains of soil related to the impact of sea and atmosphere on the designed structures. Based on the conducted analyses, a new methodology for interpreting the TS test results of soil has been proposed. It allows estim

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Van Impe, William F., and Shin-Tower Wang. "The advanced p-y method for analyzing the behaviour of large-diameter monopiles supporting offshore wind turbines." E3S Web of Conferences 205 (2020): 12008. http://dx.doi.org/10.1051/e3sconf/202020512008.

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The analyses of monopile foundations have been heavily based on the p-y response curves (to represent lateral soil resistances) published by API RP 2GEO (2011) and DNV (2013), which are proven reliable and applicable for piles with smaller diameters that were normally used for jacket structures in the offshore industry. However, concerns have been raised about the validity of semi-empirical p-y criteria for large-diameter piles. Wind turbine monopiles have a significantly larger diameter and smaller length to diameter ratio than typical piles used for offshore structures. The ratio of the leng

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Xiao, Zhong, Yan Wang, Ying Liu, Yinghui Tian, Rong Wang, Ran Tao, and Xian Wei. "Formulas for Uniaxial Capacities of Tetrapod Bucket Foundations Considering Group Effects in Undrained Clay." Applied Sciences 12, no. 11 (May 25, 2022): 5353. http://dx.doi.org/10.3390/app12115353.

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Suction bucket foundation is a novel and cheaper foundation used in marine structures, such as offshore wind turbines, breakwater and oil platforms. Compared with a single bucket foundation, tetrapod bucket foundations can bear larger loads because of the group effects. However, the vertical, horizontal and moment capacity factors of tetrapod bucket foundations have not been presented in existing specifications. A series of three-dimensional finite-element analyses were conducted to investigate the group effects on uniaxial capacities and failure mechanisms of tetrapod bucket foundations in un

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Adhikari, S., and S. Bhattacharya. "Dynamic Analysis of Wind Turbine Towers on Flexible Foundations." Shock and Vibration 19, no. 1 (2012): 37–56. http://dx.doi.org/10.1155/2012/408493.

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Offshore wind turbines are considered as an essential part to develop sustainable, alternative energy sources. The structures themselves are both slender and highly flexible, with a subsea foundation typically consisting of a single large diameter monopile. They are subject to intense wind and wave loadings, with the result that significant movement of both the exposed structure and the upper part of the monopile can occur. Although the structures are intended for design life of 25 to 30 years, very little is known about the long term behaviour of these structures. This paper characterizes the

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Kim, Hyun-Gi, Bum-Joon Kim, and Kwang-Ho Lee. "Analysis of Piled Concrete Foundation for a 3-MW Class Offshore Wind Turbine along the Southwest Coast in Korea." Journal of Marine Science and Engineering 8, no. 3 (March 20, 2020): 215. http://dx.doi.org/10.3390/jmse8030215.

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Concrete foundations have received attention as offshore wind turbine support structures because of their various advantages. However, because of the lack of information on structural analysis and the design method of complex marine environmental loads, concrete foundations cannot be applied on actual sites. Therefore, the structure behavior mechanism and concrete reinforcement design need to be evaluated based on soil-structure interactions. Herein, an efficient method for analysis of piled concrete foundations (PCFs) is presented, and the stability of PCF structures is evaluated under enviro

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Byrne, Byron W., Harvey J. Burd, Lidija Zdravković, Ross A. McAdam, David M. G. Taborda, Guy T. Houlsby, Richard J. Jardine, Christopher M. Martin, David M. Potts, and Kenneth G. Gavin. "PISA: new design methods for offshore wind turbine monopiles." Revue Française de Géotechnique, no. 158 (2019): 3. http://dx.doi.org/10.1051/geotech/2019009.

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This paper provides a summary of the PIle Soil Analysis (PISA) project, completed in the UK during the period 2013 to 2018. The research led to the development of a new, computationally efficient, one dimensional design model for laterally loaded monopile foundations, particularly for offshore wind turbine support structures. The current form of the design model is applicable to monotonic loading only, but it could form a basis for extensions to cyclic loading. This short paper describes the background to the project, outlining the key research elements completed, as well as the main impacts t

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Silva-Campillo, Arturo, Francisco Pérez-Arribas, and Juan Carlos Suárez-Bermejo. "Health-Monitoring Systems for Marine Structures: A Review." Sensors 23, no. 4 (February 13, 2023): 2099. http://dx.doi.org/10.3390/s23042099.

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This paper presents a comprehensive review of the state-of-the-art developments in health monitoring of marine structures. Monitoring the health of marine structures plays a key role in reducing the risk of structural failure. The authors establish the different sensors with their theoretical foundations and applications in order to determine the optimal position of the sensors on board. Once the data were collected, it was necessary to use for subsequent treatment; thus, the authors identified the different methodologies related to the treatment of data collected by the sensors. The authors p

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Wu, Yuan Chieh, and Che Wei Hu. "Seismic Analysis for Pile Foundations in the Liquefiable Soil Layer Using FLAC3D." Applied Mechanics and Materials 764-765 (May 2015): 1114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.1114.

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Pile foundation is the practical method to enhance earthquake-resistant ability for structures located in liquefiable soil sites. Soil liquefaction impact has been occurred such as Kashiwazaki-Kariwa NPP in 2007 Chūetsu offshore earthquake because of the soft backfill soil. To understand the behavior of pile foundations in liquefied soil during earthquake attack and conform to nuclear standard, seismic analysis with soil-structure interaction considering liquefaction using the finite difference program FLAC3D is developed to renew the traditional method used in nuclear industry. The models ar

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Cerfontaine, B., M. J. Brown, C. Davidson, Y. U. Sharif, M. Huisman, and M. Ottolini. "Optimised screw pile design for offshore jacket foundations in medium–dense sand." Géotechnique Letters 12, no. 2 (June 1, 2022): 1–6. http://dx.doi.org/10.1680/jgele.21.00105.

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Screw piles are well-suited foundations for offshore jacket structures, as they can be installed without significant underwater noise and have a large axial capacity. However, installation requirements for such large piles must be reduced to enable their installation in the field. This study combines geometry and installation optimisation to lower force and torque installation requirements. An original pile geometry, composed of a large diameter upper section connected to a smaller diameter lower section by a transition piece, was tested in a geotechnical beam centrifuge. The advancement ratio

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Dixen, Martin, Iris Pernille Lohmann, and Erik Damgaard Christensen. "METHOD TO PREDICT LONG TIME SPAN OF SCOUR AROUND OFFSHORE WIND TURBINE FOUNDATIONS." Coastal Engineering Proceedings 1, no. 33 (October 25, 2012): 88. http://dx.doi.org/10.9753/icce.v33.sediment.88.

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A new method to predict scour development around offshore structures has been developed. The method has been tested on a monopile. The method consists of table of scour rates, which is used to predict the scour development around the structure at different stages of the scour hole. The scour rate tables have been made based on full 3D numerical simulations of the flow and sediment transport for fixed configurations of the scour hole. When changing the governing parameters which are causing the scour development around the structure, the erosion rate or backfilling rate can be calculated from t

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Puruncajas, Bryan, Yolanda Vidal, and Christian Tutivén. "Vibration-Response-Only Structural Health Monitoring for Offshore Wind Turbine Jacket Foundations via Convolutional Neural Networks." Sensors 20, no. 12 (June 17, 2020): 3429. http://dx.doi.org/10.3390/s20123429.

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This work deals with structural health monitoring for jacket-type foundations of offshore wind turbines. In particular, a vibration-response-only methodology is proposed based on accelerometer data and deep convolutional neural networks. The main contribution of this article is twofold: (i) a signal-to-image conversion of the accelerometer data into gray scale multichannel images with as many channels as the number of sensors in the condition monitoring system, and (ii) a data augmentation strategy to diminish the test set error of the deep convolutional neural network used to classify the ima

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George, S. R., A. K. Verma, A. N. Desai, B. R. Dalwadi, and K. K. R. Iyer. "Effect of Soil-Pile-Structure Interaction on Behaviour of Offshore Jacket Structure." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 1539–45. http://dx.doi.org/10.38208/acp.v1.686.

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Offshore jacket structures are generally supported on pile foundations. Studies have evaluated the effect of soil-pile interaction on design of foundation; however, effect of soil-pile-structure interaction on behaviour of jacket structure has received little attention. Hence, present study focuses on understanding the influence of soil conditions, soil-pile interaction and foundation modeling approach on deformation characteristics and member forces of jacket structure. Linear static analysis on a typical 4-legged battered jacket structure is performed using STAAD Pro., subjected to dead/live

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Nessim, Maher A., Han Ping Hong, and James G. MacGregor. "Verification of the material resistance factors in the CSA-S474 code for offshore concrete structures." Canadian Journal of Civil Engineering 20, no. 4 (August 1, 1993): 660–71. http://dx.doi.org/10.1139/l93-083.

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The Canadian Standards Association has developed a national code for the design, construction and installation of fixed offshore structures. This code was developed on the basis of probabilistic principles. It consists of five parts (CAN/CSA-S471 to S475), dealing with general loading and design requirements, foundations, steel structures, concrete structures, and sea operations. The material resistance factors cited in the part on concrete structures (S474-M1989) were verified using data typical of offshore structures for a set of representative design cases. The test cases were based on rein

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Lang, Ruiqing, Run Liu, Jijian Lian, and Hongyan Ding. "Study on Load-Bearing Characteristics of a New Pile Group Foundation for an Offshore Wind Turbine." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/394104.

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Because offshore wind turbines are high-rise structures, they transfer large horizontal loads and moments to their foundations. One of the keys to designing a foundation is determining the sensitivities and laws affecting its load-bearing capacity. In this study, this procedure was carried out for a new high-rise cap pile group foundation adapted to the loading characteristics of offshore wind turbines. The sensitivities of influential factors affecting the bearing properties were determined using an orthogonal test. Through a combination of numerical simulations and model tests, the effects o

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Abdullahi, A., Y. Wang, and S. Bhattacharya. "Comparative Modal Analysis of Monopile and Jacket Supported Offshore Wind Turbines including Soil-Structure Interaction." International Journal of Structural Stability and Dynamics 20, no. 10 (September 2020): 2042016. http://dx.doi.org/10.1142/s021945542042016x.

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Offshore wind turbines (OWTs) have emerged as a reliable source of renewable energy, witnessing massive deployment across the world. While there is a wide range of support foundations for these structures, the monopile and jacket are most utilized so far; their deployment is largely informed by water depths and turbine ratings. However, the recommended water depth ranges are often violated, leading to cross-deployment of the two foundation types. This study first investigates the dynamic implication of this practice to incorporate the findings into future analysis and design of these structure

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Majdi Nasab, Navid, Jeff Kilby, and Leila Bakhtiaryfard. "Integration of wind and tidal turbines using spar buoy floating foundations." AIMS Energy 10, no. 6 (2022): 1165–89. http://dx.doi.org/10.3934/energy.2022055.

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<abstract> <p>Floating platforms are complex structures used in deep water and high wind speeds. However, a methodology should be defined to have a stable offshore structure and not fail dynamically in severe environmental conditions. This paper aims to provide a method for estimating failure load or ultimate load on the anchors of floating systems in integrating wind and tidal turbines in New Zealand. Using either wind or tidal turbines in areas with harsh water currents is not cost-effective. Also, tidal energy, as a predictable source of energy, can be an alternative for wind en

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Wang, Zhuo, Zhuang Li, Tao Wang, and Bo Zhang. "Study on Clamping Mechanism of Internal and External Variable Diameter Lifting Tool for Offshore Foundation Pile." Machines 9, no. 1 (January 17, 2021): 19. http://dx.doi.org/10.3390/machines9010019.

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Large marine foundation piles are an important part of offshore structural pile foundations, and their lifting operations have always been a major problem in the construction and construction of marine structures. Based on IHC’s bilateral marine foundation pile spreader, this paper proposes a structural scheme of “internal and external clamping type variable diameter marine foundation pile spreader”. It solves the problem of poor adaptability of spreaders to foundation piles of the same specification and different pipe diameters. At the same time, this article has conducted in-depth research o

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George, S. R., A. K. Verma, B. R. Dalwadi, and K. K. R. Iyer. "A Parametric Study on Effect of Wave Height, Water Depth and Support Conditions on Behaviour of Offshore Jacket Structure." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 1757–63. http://dx.doi.org/10.38208/acp.v1.715.

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Fixed offshore jacket structures are constructed for facilitating oil/gas exploration and production. These structures and their foundations are designed to resist large vertical and lateral loads. Various factors including water depth, wave height and support conditions would affect the response of jacket structures. However, few studies have focused on understanding the response of offshore jacket structure due to variation in these factors. In this context, the present work evaluates response of typical X-braced, square base, 4-legged battered jacket structure using STAAD Pro. under combine

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Sun, Zhenzhou, Shengxiao Zhao, Chunwei Bi, Qiupan Chen, Shanshan Huang, and Jiefeng Chen. "Dynamic Response Analysis of an Offshore Converter Platform with Valve Towers under Seismic Excitation." Symmetry 14, no. 8 (August 9, 2022): 1635. http://dx.doi.org/10.3390/sym14081635.

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Converter valves are the core equipment of offshore wind power structures. However, they are highly vulnerable to vibration under strong earthquakes, which will affect normal operation of the offshore wind farm. Converter station is an axisymmetric structure with obvious asymmetry in its internal configuration of the superstructure. This study aimed to analyze the dynamic response of a supported converter valve in an offshore converter station under seismic excitation. The coupling model of the supported valve tower group and the converter station were established, and the distribution law of

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de Sitter, Gert, Wout Weitjens, Mahmoud El-Kafafy, and Christof Devriendt. "Monitoring Changes in the Soil and Foundation Characteristics of an Offshore Wind Turbine Using Automated Operational Modal Analysis." Key Engineering Materials 569-570 (July 2013): 652–59. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.652.

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This paper will show the first results of a long term monitoring campaign on an offshore wind turbine in the Belgian North Sea. It will focus on the vibration levels and resonant frequencies of the fundamental modes of the support structure. These parameters will be crucial to minimize O&M costs and to extend the lifetime of offshore wind turbine structures. For monopile foundations for example, scouring and reduction in foundation integrity over time are especially problematic because they reduce the fundamental structural resonance of the support structure, aligning that resonance freque

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Ju, Shen-Haw, Chueh-Sheng Chiu, and Hsin-Hsiang Hsu. "Studying the Settlement of OWT Monopile Foundations Using a T-Z Spring with the Torsional Effect." Processes 11, no. 2 (February 6, 2023): 490. http://dx.doi.org/10.3390/pr11020490.

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The main purpose of this paper was to study the vertical settlement of offshore wind turbine (OWT) monopile support structures, where 5, 10, 15, and 20 MW OWT support structures were analyzed under power production, seismic, and tropical cyclone loads. Moreover, a t-z spring with shear and torsional degrees of freedom was developed to simulate the shear stress along the pile and soil surface under the combined effect of vertical loads and z-direction torsions. This t-z spring does not require excessive changes to the finite element program, where only a known factor is used to modify the tradi

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Statti, Giuseppe, Ali Mehmanparast, Romali Biswal, and Cesare Mario Rizzo. "Evaluation of Cyclic Loading Effects on Residual Stress Relaxation in Offshore Wind Welded Structures." Journal of Multiscale Modelling 12, no. 02 (June 2021): 2150005. http://dx.doi.org/10.1142/s1756973721500050.

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Monopile foundations contain welding residual stresses and are widely used in industry to support offshore wind turbines (OWTs). The monopiles are subjected to hammering loads during installation and cyclic loads during operation, therefore the influence of residual stress redistribution as a result of fatigue cycles must be evaluated in these structures. The existing empirical models to predict the residual stress redistribution in the presence of cyclic loading conditions are strongly dependent on the material, welding process and loading conditions. Hence, there is a need to predict the res

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