Relevant bibliographies by topics / Offshore structures – Anchorage

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  2. Dissertations / Theses
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  4. Conference papers

Academic literature on the topic 'Offshore structures – Anchorage'

Author: Grafiati
Published: 4 June 2021
Last updated: 21 February 2023

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Journal articles on the topic "Offshore structures – Anchorage"

1

Preece, Chris. "Janzur: anchorage, trade, industry and development on the Tripolitanian littoral." Libyan Studies 42 (2011): 47–58. http://dx.doi.org/10.1017/s0263718900004799.

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AbstractThe identification of a headland anchorage at Janzur and the finding of ceramic material offshore in 2009 led the Department of Antiquities in Tripoli to agree to an underwater scoping survey, the results of which are discussed. The site adjacent to the anchorage was subject to a large waterfront development and during groundwork a number of kilns and other structures related to the anchorage were revealed. The implications of this and neighbouring sites are discussed in regard to trade and industry in antiquity. Concerns regarding modern development are discussed and some proposals are mooted.
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Geng, Tiesuo, Shuanghua Chen, Liuqun Zhao, and Zhe Zhang. "Research on Bonding Performance of Anchorage Caisson Foundation with Different Contact Surfaces and Grouting Bed." Buildings 11, no. 8 (August 19, 2021): 365. http://dx.doi.org/10.3390/buildings11080365.

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In view of the first domestic offshore suspension bridge with caisson foundation, this paper mainly studies the bonding properties between underwater pre-filled aggregate grouting bed and anchorage caisson foundation. Through the test, the cohesive force of adding ordinary concrete between the anchorage caisson foundation and the grouting bed, the cohesive force of adding paper base asphalt felt between the anchorage caisson foundation and the grouting bed, and the cohesive force of adding geotextile between the anchorage caisson foundation and the grouting bed are measured, respectively. When the contact surface is concrete and geotextile, the fracture form of the specimen was analyzed by numerical simulation, and the AE variation trend of the two specimens have been studied. The results of this article can provide references for other projects.
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Tirandazian, Mehran, and Gholamreza Nouri. "Numerical modeling of the seismic performance of monopile supported wind turbines in sandy soils susceptible to liquefaction." International Journal of Engineering & Technology 7, no. 2.13 (April 15, 2018): 263. http://dx.doi.org/10.14419/ijet.v7i2.13.12676.

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Since 1980, as wind farms have moved from coastal to offshore areas, the wind energy industry has been completely transformed which in turn has led to the increase in the construction of wind turbines. On the other hand, harsher offshore environmental conditions have led to larger lateral loads and anchorages applied to the wind turbines and specifically to their piles than other coastal and offshore structures. Thus, more solid piles are required to ensure proper rigidity and bearing capacity. Liquefaction is one of the most important seismic hazards through which various damages caused to different parts of wind turbines. In order to develop coastal and offshore structures in Iran, a study of liquefaction is of great importance due in part to the high risk of seismicity. In this study, the effect of liquefaction on seismic response of offshore wind turbines is examined taking advantage of a finite element model. To this end, all analyzes have been carried out in both occurrence and non-occurrence of the liquefaction, so that by comparing these two modes, the mechanisms affecting the seismic behavior of wind turbines are understood. As depth increases, the possibility of liquefaction is reduced due to higher pressure. Liquefaction is considered to a depth of 20 m and structural behavior is evaluated based on the level of seismic hazard, the thickness of the susceptible layers, soil compaction, the non-fluidizing top layer, the gradient of the earth, the thickness of the monopole, the dimensions of the wind turbine and different soil layering conditions. According to the mentioned factors, a comprehensive and parametric study of the behavior of wind turbines in seismic zones, and in different loading conditions, pile diameters and soil layering is carried out in soils prone to liquefaction. Since analyzes are performed in both occurrence and non-occurrence of the liquefaction, the number of analyzes and computational cost in this research becomes enormous. Therefore, there is a need for a highly effective software and a practical modeling method that will allow for this comprehensive study. Open Sees software and beam on nonlinear Winkler foundation approach are used to model the soil-pile-structure interaction. The minor differences observed in the laboratory values compared to the numerically calculated ones may refer to the fact that the chamber is not modeled. In the bottom layer, as the depth decreases, the elastic response spectra record larger values which are due to the resonance in the structure.
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Dissertations / Theses on the topic "Offshore structures – Anchorage"

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Richardson, Mark Damian. "Dynamically installed anchors for floating offshore structures." University of Western Australia. School of Civil and Resource Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0230.

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The gradual depletion of shallow water hydrocarbon deposits has forced the offshore oil and gas industry to develop reserves in deeper waters. Dynamically installed anchors have been proposed as a cost-effective anchoring solution for floating offshore structures in deep water environments. The rocket or torpedo shaped anchor is released from a designated drop height above the seafloor and allowed to penetrate the seabed via the kinetic energy gained during free-fall and the anchor’s self weight. Dynamic anchors can be deployed in any water depth and the relatively simple fabrication and installation procedures provide a significant cost saving over conventional deepwater anchoring systems. Despite use in a number of offshore applications, information regarding the geotechnical performance of dynamically installed anchors is scarce. Consequently, this research has focused on establishing an extensive test database through the modelling of the dynamic anchor installation process in the geotechnical centrifuge. The tests were aimed at assessing the embedment depth and subsequent dynamic anchor holding capacity under various loading conditions. Analytical design tools, verified against the experimental database, were developed for the prediction of the embedment depth and holding capacity.
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Chin, Jhin-Thiam. "Axial pile response in calcareous sediment." Phd thesis, School of Civil and Mining Engineering, 1992. http://hdl.handle.net/2123/7131.

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Maluleke, Vutlhari Absalom. "The effects of boat mooring systems on squid egg beds during squid fishing." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2528.

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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2017.
In South Africa, squid fishing vessels need to find and then anchor above benthic squid egg beds to effect viable catches. However, waves acting on the vessel produce a dynamic response on the anchor line. These oscillatory motions produce impact forces of the chain striking the seabed. It is hypothesised that this causes damage to the squid egg bed beneath the vessels. Different mooring systems may cause more or less damage and this is what is investigated in this research. The effect of vessel mooring lines impact on the seabed during squid fishing is investigated using a specialised hydrodynamic tool commercial package ANSYS AQWA models. This study analysed the single-point versus the two-point mooring system’s impact on the seabed. The ANSYS AQWA models were developed for both mooring systems under the influence of the wave and current loads using the 14 and 22 m vessels anchored with various chain sizes. The effect of various wave conditions was investigated as well as the analysis of three mooring line configurations. The mooring chain contact pressure on the seabed is investigated beyond what is output from ANSYS AQWA using ABAQUS finite element analysis. The real-world velocity of the mooring chain underwater was obtained using video analysis. The ABAQUS model was built by varying chain sizes at different impact velocities. The impact pressure and force due to this velocity was related to mooring line impact velocity on the seabed in ANSYS AQWA. Results show the maximum impact pressure of 191 MPa when the 20 mm diameter chain impacts the seabed at the velocity of 8 m/s from video analysis. It was found that the mooring chain impact pressure on the seabed increased with an increase in the velocity of impact and chain size. The ANSYS AQWA impact pressure on the seabed was found to be 170.86 MPa at the impact velocity of 6.4 m/s. The two-point mooring system was found to double the seabed mooring chain contact length compared to the single-point mooring system. Both mooring systems showed that the 14 m vessel mooring line causes the least seabed footprint compared to the 22 m vessel.
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Champi, Farfan David. "Estudo do comportamento estatico e dinamico de um Riser vertical com boia de subsuperficie." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263664.

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Orientador: Celso Kazuyuki Morooka
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica e Instituto de Geociencias
Made available in DSpace on 2018-08-04T17:58:55Z (GMT). No. of bitstreams: 1 ChampiFarfan_David_M.pdf: 3228003 bytes, checksum: 8b3ed290e87307aa0cc1afcdd9c2ecf3 (MD5) Previous issue date: 2005
Resumo: Na atualidade as descobertas de óleo a grandes profundidades no mar têm levado ao desenvolvimento de campos localizados numa profundidade aproximada de 3000m, sendo então o sistema de Riser Híbrido Auto-Sustentável uma alternativa atraente. O presente trabalho apresenta os modelos matemáticos que descrevem o comportamento estático e dinâmico de um riser vertical com bóia de sub-superfície nas direções in-line, que é a direção da onda e correnteza no mar, e a direção transversal, perpendicular à direção in-line. Apresentam-se também simulações numéricas em diferentes condições de onda e correnteza e o seu efeito combinado, assim como o estudo paramétrico para as principais variáveis que influenciam no comportamento dinâmico e estático
Abstract: Nowadays, the oil discoveries at big depths in the sea have taken to the development of fields located in an approach depth of 3000m, being the Self Standing Hybrid Riser an attractive alternative. The present work presents the mathematical models that describe the static and dynamic behavior of a Vertical riser with a subsurface buoy in the directions inline, that it is the direction of the wave and currents in the sea, and the transversal, that is perpendicular to the in-line direction. Numerical simulations in different conditions of wave and currents are also presented and its combined effect is studied, as well as the parametric study for the main variable that influences its dynamic and static behavior
Mestrado
Explotação
Mestre em Ciências e Engenharia de Petróleo
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El-Sherbiny, Rami Mahmoud. "Performance of suction caisson anchors in normally consolidated clay." Thesis, 2005. http://hdl.handle.net/2152/1900.

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Maniar, Dilip Rugnathbhai. "A computational procedure for simulation of suction caisson behavior under axial and inclined loads." Thesis, 2004. http://wwwlib.umi.com/cr/utexas/fullcit?p3143307.

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7

Raie, Mohammad Sayfolah 1977. "A computational procedure for simulation of torpedo anchor installation, set-up and pull-out." 2009. http://hdl.handle.net/2152/18387.

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Torpedo-shaped anchors serve as foundations for risers and floating structures in the deep-water marine environment. Such cone-tipped, cylindrical steel pipes, ballasted with concrete and scrap metal, penetrate the seabed by the kinetic energy they acquire during free fall. Estimation of the embedment depth is a crucial part of the design process in that the pull-out capacity is strongly dependent on the strength of the surrounding soil. This dissertation presents the development of a procedure based on a computational fluid dynamics (CFD) model for the prediction of the embedment depth of torpedo anchors. By means of a representation of the soil as a viscous fluid, the CFD model leads not only to the resisting forces on the anchor but the distributions of pressure and shear in the soil as well. These distributions are then imported in another computational tool for finite-element (FE) analysis of coupled deformation and fluid flow in porous media for further simulations of reconsolidation of the soil next to the anchor and, ultimately, short-term and long-term capacity estimation. This dissertation presents CFD results for torpedo-anchor installation in soil, comparisons with experimental data and, finally, results from FE analysis of soil reconsolidation and anchor pull-out.
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Books on the topic "Offshore structures – Anchorage"

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Wimpey Offshore Engineers and Constructors. The strength of grouted pile-sleeve connections: Tests carried out by Wimpey Laboratories Limited. London: HMSO, 1986.

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2

NATO Advanced Study Institute on Advances in Berthing and Mooring of Ships and Offshore Structures (1987 Trondheim, Norway). Advances in berthing and mooring of ships and offshore structures. Dordrecht, Netherlands: Kluwer Academic Publishers, 1988.

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Faÿ, Hubert. Ancrage dynamique: Technique et applications. Paris: Technip, 1988.

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Dynamic Positioning Conference (1997 Houston, Tex.). 1997 Dynamic Positioning Conference, Houston, Texas. Houston, Tex: Marine Technology Society, 1997.

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Chengi, Kuo, University of Strathclyde, Society for Underwater Technology, and Royal Institution of Naval Architects., eds. Stationing and stability of semi-submersibles. London, UK: Graham & Trotman, 1986.

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6

Gobat, Jason I. The dynamics of geometrically compliant mooring systems. Cambridge, Mass: Massachusetts Institute of Technology, 2000.

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7

Luo, Yong, Kai-Tung Ma, Chi-Tat Thomas Kwan, and Yongyan Wu. Mooring System Engineering for Offshore Structures. Elsevier Science & Technology, 2019.

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Luo, Yong, Kai-Tung Ma, Chi-Tat Thomas Kwan, and Yongyan Wu. Mooring System Engineering for Offshore Structures. Elsevier Science & Technology Books, 2019.

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9

Technip, Editions. Design Guides for Offshore Structures (Collection Colloques Et Seminaires,). Editions Technip, 1990.

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Technip, Editions. Design Guides for Offshore Structures (Collection Colloques Et Seminaires,). Editions Technip, 1987.

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Conference papers on the topic "Offshore structures – Anchorage"

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Zhang, Hong, Hang Yuan, and Hehui Zheng. "Key Construction Techniques of East Tower and Anchorage of Lingdingyang Bridge in Shenzhong Link." In IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/nanjing.2022.2066.

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<p>Lingdingyang Bridge of Shenzhong Link is a three-span suspension bridge with a full floating system of 580 + 1666 + 580. In view of the complex construction conditions of the bridge site, the construction scheme of island cofferdam was proposed for the east anchorage, and the flexible combined island cofferdam structure of ' lock steel pipe pile + I-shaped sheet pile + parallel steel wire rope ' was innovatively adopted to transform the offshore construction into land construction. For the east cable tower, the flexible manufacturing production line of steel mesh was developed, and the integrated intelligent tower building equipment suitable for ultra-high concrete cable tower was developed, forming the industrial construction technology of ultra-high cable tower based on reinforced bar product and intelligent tower building. The key construction technology of anchorage and tower solves the construction problem of super long-span suspension bridge in offshore sea, and improves the intelligent and industrial construction level of ultra-high tower engineering.</p>
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Smith, Orson P., John Schibel, Scott Hamiltion, and Robert Thomas. "Ice Navigation Curriculum using the AVTEC Ship Simulator, Seward, Alaska." In SNAME 9th International Conference and Exhibition on Performance of Ships and Structures in Ice. SNAME, 2010. http://dx.doi.org/10.5957/icetech-2010-121.

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Alaska’s Arctic offshore has unprecedented attention for its prospects of mineral extraction, tourism, and new marine cargo delivery routes. The ship simulator operated by the Alaska Marine Training Center at AVTEC in Seward, Alaska, has capabilities for training ship crews for ice navigation duty, including simulation of variable ice conditions, winds, currents, and sea states. A curriculum developed by AVTEC in collaboration with the University of Alaska Anchorage, and Alaska Pilots satisfies proposed requirements of the International Convention on Standards of Training, Certification, and Watchkeeping for Seafarers, with a view toward spill prevention, emergency operations, and Arctic port design.
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Needham, Mike, and James Collins. "The New Storstrøm Bridge – Pier Design." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0104.

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<p>The New Storstrøm Bridge in Denmark has 40 concrete piers ranging from 18 to 35m high. The piers comprise multi-faceted stems and pier heads. To simplify offshore construction a precast segmental solution was used, with a prestressed insitu pier head. The design was optimised through parametric analysis including non-linear modelling and automated calculation reporting. A modular approach maximised repetition of segments between different pier heights to enable precast construction in a factory environment prior to assembly offshore. Non-linear dynamic modelling was used to validate resistance to ship impact. Detailed analysis of the insitu joints between segments was undertaken, using headed bars to provide the required anchorages. The pier head was designed using finite element models to confirm the strut and tie behaviour and a prestress layout that minimised external pockets.</p>
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Eranti, Esa, Eero Lehtonen, Heikki Pukkila, and Lasse Rantala. "A Novel Offshore Windmill Foundation for Heavy Ice Conditions." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49663.

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A pilot offshore wind turbine with a new type of an ice-resistant foundation was installed in the Pori sea area of the Northern Baltic Sea during summer 2010. The water depth at the site is nine meters and the ice and wave conditions occasionally get quite heavy. The gravity-type foundation consists of a light ice-strengthened steel shell with a ring footing, ice-breaking cone, and crushed rock fill. The fill provides mass for the foundation and supports the shell against local ice impacts and moments caused by uneven base pressures, as well as stability for the thin shell structure. The ring footing extends the stabilizing moment arm and provides anchorage against overturning. This foundation concept is applicable to a variety of water depths with firm to hard bottom conditions. Foundation erection is fast and easy, making it well-suited for industrial wind farm roll-out.
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ter Brake, Erik, Mike Todman, and John Armstrong. "Development of 3MW Tidal Energy Platform." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10299.

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The Triton-3 platform is a novel tidal energy harvester capable of producing 3MW from tidal flow. The platform is a floating structure moored to the seabed by a single-point fully articulated anchorage, and carries three power trains and a number of marine auxiliaries. The driver for the design as developed by TidalStream Ltd is to reduce the cost of energy production in order to compete with the current cost of offshore wind. Independently audited cost modelling shows that tidal stream energy can become competitive with offshore wind, achieving a generating cost as low as 10p/kWh at the best sites. This generating cost is estimated to be less than half that which could be achieved at a similar site from a single seabed-located turbine. The driving aspects for the competitive cost are maximising the capacity per mooring point, reducing installation costs by float-out solutions and by providing easy access to the tidal equipment. Access is achieved by allowing the platform to come to the surface by means of de-ballasting. By doing so, there is no need for large workboats and/or diver activities to perform regular inspection and maintenance on the tidal equipment, reducing the cost significantly. The technical aspects that arise when developing the tidal turbine platform for a typical offshore location are investigated by Houlder Ltd and discussed in this paper. A number of technical challenges have been addressed where the rotational stability in both roll and pitch are of interest. The roll of the platform is heavily affected by the performance of the turbines; sudden increase or reduction in thrust will induce significant rolling moments that must not impair the integrity of the platform. Pitching of the platform allows it to reach the surface when de-ballasted for maintenance and inspection. During normal operations, the platform remains aligned with the current and in doing so maximises the performance of the turbines. The paper illustrates how these aspects have been achieved by means of passive solutions. By means of positioning and shaping the main body of the platform, a working configuration has been developed where the rotations of the platform remain within a limited window maximising the potential power production. The concept has been tested by TidalStream during a large-scale model testing campaign where the unit was subject to different current speeds and different turbine configurations and fault cases. This publication compares the results of the large scale model testing with numerical models developed in OrcaFlex and shows the effectiveness of the passive solutions.
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