Relevant bibliographies by topics / Offshore jacket platform

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Offshore jacket platform'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Offshore jacket platform"

1

Shen, Zhao Wei, Wei Liang Jin, and Xiao Hong Wang. "Reliability of the Offshore Jacket Platform Based on Load Combination." Applied Mechanics and Materials 405-408 (September 2013): 1415–19. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1415.

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Offshore jacket platforms under complicated and changeful ocean environments are subjected to various stochastic actions such as actions of wave, current, wind, ice, earthquake and their combinations. This paper presented the approach to calibrate of the reliability of the offshore jacket platform, and suggested all kinds of associated load cases. The combination of loads were mainly investigated. As an example, the reliability of offshore jacket platform of QK18-1 in Bohai Bay was verified. The result shows that the reliability of the offshore jacket platform related to 25-year reference period is between 2.7 and 3.39, which is close to the conclusion of some existing researches. This method would be used more widely for the design of offshore jacket platforms.
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Yan, Qing Zhi, Zhan Zhang, Liang Cui, and Yan Hua Wang. "Study on Reliability of Jacket Offshore Platform by Seismic Action Based on ANSYS." Advanced Materials Research 163-167 (December 2010): 3023–28. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3023.

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Jacket Offshore Platform is a complex statically indeterminate structure, reliability of which is impacted by many factors, and the earthquake is a main factor. This paper simplify the significant failure mode of Jacket Offshore Platform by standard. Calculate the reliability of Jacket Offshore Platform under the effect of earthquake with the Monte Carlo method based on ANSYS. The result can provide evidence for safety assessment of Jacket Offshore Platform.
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Yan, Qing Zhi, Zhan Zhang, Liang Cui, and Yan Hua Wang. "Structural Optimization of Offshore Jacket Platform Based on ANSYS." Advanced Materials Research 163-167 (December 2010): 3029–33. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3029.

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Offshore Jacket Platform is a very important infrastructure in the offshore oil exploration and exploitation. In order to make it more economical, designers should do Structural Optimization to it. This paper do Structural Optimization to Offshore Jacket Platform, and provide reference for the using of ANSYS in the Structural Optimization of Offshore Jacket Platform.
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Sarhan, Osamah, and Mahdy Raslan. "Offshore petroleum rigs/platforms: An overview of analysis, design, construction and installation." International Journal of Advanced Engineering, Sciences and Applications 2, no. 1 (January 31, 2021): 7–12. http://dx.doi.org/10.47346/ijaesa.v2i1.58.

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Jacket platforms are one of the most important and regularly used types of offshore structures for oil and gas extraction that have a big impact on the economy of the countries. In this paper, all aspects including design, analysis, construction and installing of the jacket type offshore structure, are summarized and classified. This type of structure is one of the specified platforms for shallow water, and for long term service, it also has the ability to carry large deck loads. This paper aims to present general guidance about the planning, design and construction of offshore jacket (template) platforms. Jacket platforms are fixed type platforms which are attached to the seabed using piles which provide stability against the wind, wave and current loads. Also, this type of offshore platform has a high initial and maintenance cost because of its exposure to corrosion, and cannot be reused after the end of its service period. Jacket platforms are most suitable for shallow water having no better alternative while it has the cost disadvantage for deep water.
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George, Jerin M., V. John Kurian, and M. M. A. Wahab. "Incorporation of Axial Aging Effects of Pile Foundations into Pushover Analysis of Offshore Jacket Platforms." Applied Mechanics and Materials 877 (February 2018): 270–75. http://dx.doi.org/10.4028/www.scientific.net/amm.877.270.

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The integrity assessment of jacket platforms using non-linear pushover analysis in the past had shown that most of the platform failure occur due to the lack of strength in the pile foundation. When the failure of jacket platforms in extreme weather conditions were studied, it was observed that the foundation was intact while the platform failed. This disagreement between the simulation and the actual condition can be explained by the phenomenon of Aging of pile foundations. Experimentally, the axial capacity of pile foundations have been found to be improving with time due to aging. The rate of improvement of the capacity can be empirically predicted using the properties of the soil in which the pile is installed. An empirical equation namely Skov and Denver equation was utilised to determine the improvement in capacity of offshore jacket piles in this study. This improvement was incorporated into the pile-soil modelling of jacket platforms using a new, yet very simple technique of stepping up the axial soil structure interaction curves. Pushover analysis of two offshore jacket platforms with the modified pile-soil model was done using the software SACS. The RSR (Reserve Strength Ratio) obtained from the pushover analysis showed significant difference due to the incorporation of the axial aging effects of the piles. Jacket A has showed a maximum improvement in RSR of 11% and a maximum reduction of RSR of 11% whereas Jacket B has showed a maximum improvement in RSR of 27% and a maximum reduction of RSR of 17%. The study has given a good insight into the changes in behaviour of a jacket platform due to aging of its pile foundations and is expected to improve the structural integrity assessment techniques of aged offshore jacket platforms.
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Shen, Zhao Wei, Xiao Hong Wang, and Wei Liang Jin. "Reliability of Pile Foundation of Offshore Jacket Platforms Subjected to Seismic Action." Advanced Materials Research 919-921 (April 2014): 1047–51. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1047.

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Pile foundation of offshore platform is very important. Earthquake is devastating and unpredictable.It is important to assess the reliability of pile foundation of offshore jacket platforms subjected to seismic action. This paper presents the approach to calibrate of reliability of pile foundation subjected to seismic action. The combination of loads are mainly investigated. The reliability of pile foundation of of QK18-1 in Bohai Bay related to 25-year reference period is3.37, which is close to the conclusion of some existing researches. The results could provide significant reference for the design of offshore jacket platforms.
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Feng, Hua-Nv, Bao-Lin Zhang, Qing Li, and Gong-You Tang. "Delayed Fuzzy Output Feedback H∞ Control for Offshore Structures." Journal of Marine Science and Engineering 8, no. 6 (June 12, 2020): 434. http://dx.doi.org/10.3390/jmse8060434.

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Vibration damping of jacket platforms is among the significant issues in marine science and engineering, and the design of active vibration control schemes is very important to ensure the stability and safety of the jacket platforms against external loadings. This paper provides three fuzzy output feedback H ∞ controllers of the jacket platforms for irregular wave forces. By considering time-varying masses of jacket platforms, a Takagi-Sugeno (T-S) fuzzy dynamic model of the structure is established. Then fuzzy output feedback H ∞ control schemes are developed via using output signals of the platform with current and/or are delayed. Several existence conditions of fuzzy output feedback H ∞ controllers are derived. Simulation results demonstrate that the fuzzy output feedback H ∞ control strategies are remarkable to suppress the vibration of structure. Moreover, by choosing proper delayed output information of the system, the presented delayed fuzzy output feedback H ∞ control schemes outperform the conventional fuzzy output feedback H ∞ control approach.
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Han, Xiaoshuang, Weiliang Qiao, and Bo Zhou. "Frequency Domain Response of Jacket Platforms under Random Wave Loads." Journal of Marine Science and Engineering 7, no. 10 (September 21, 2019): 328. http://dx.doi.org/10.3390/jmse7100328.

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This article presents a procedure that simplifies an offshore jacket platform as a non-uniform cantilever beam subjected to an axial force. A Ritz method combined with a pseudo-excitation method is then used to analyze the responses of the jacket platform under random wave loads with the associated power spectral densities, variances and higher spectral moments. The theoretical basis and pertinent governing equations are derived. The proposed procedure not only eases the process of determining the pseudo wave loads, but also requires only the rudimentary structural details that are typically available at the preliminary design stage. Additionally, the merit of the proposed procedure is that the process does not require one to compute the normal modes, which saves time and is particularly convenient for the dynamic-response analysis of a complex structure (such as an offshore platform). An illustrative example based on a three-deck jacket platform is presented to demonstrate the procedure used to obtain the power spectral densities, variances and second spectral moments of jacket-top displacement and the bending moment of the jacket at the mud line. The results obtained are compared with those obtained using a Finite Element Mothed (FEM) model. Based on the findings of the study and good agreement shown in the comparison of results, it is concluded that the proposed method is effective, simple and convenient, and can be a useful tool for the preliminary design analysis of offshore platforms.
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Silvianita, Andika Trisna Putra, Daniel M. Rosyid, Dirta Marina Chamelia, and Imam Rochani. "Evaluation of Delay Factors in Jacket Structure Project." Applied Mechanics and Materials 836 (June 2016): 317–22. http://dx.doi.org/10.4028/www.scientific.net/amm.836.317.

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Offshore platforms are used worldwide for drrilling, proceesing and even storage purposes. The offshore platforms can be fixed to the seabed, or can be float. The fixed platform namely jacket structure is a complex construction and design. Construction process of the jacket structure sometimes is not in accordance with the time schedule. There are many factors affect them, limited time, equipment, materials required, and cost of human resources. In order to analyze the delay factors of a jacket project requires a systematic approach. This paper will discusses the delay factors of the construction of Jacket Structure using FTA (Fault Tree Analysis). Data is obtained from one fabrication company which involve their experts to identify the contribution of delay project. There are three main factors causing the Jacket project delay namely Long Process of Procurement, Late Schecule of Assembly Structure, and Bad Management.
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Hasanov, F. G. "Technology of steel jackets load-out in deep-water offshore platforms from the barge." Azerbaijan Oil Industry, no. 2 (February 15, 2020): 25–29. http://dx.doi.org/10.37474/0365-8554/2020-2-25-29.

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Currently, great attention is paid to the development issue of the shelf’s fuel and energy resources foremost in the oil-gas fields of the Caspian Sea. The problem solution requires the studying of great majority of scientific-technical issues. One of the significant problems is the lead-out of steel jacket from the offshore platform as a major element of oil-gas field hydro-technical facilities meant for the operation in the deep water. The calculations for the execution of operations with steel jacket of deep stationary platform from the block with the detailed chara- cteristics by the mass and gravity center coordinates alongside line data have been carried out with “SACS” and “STAAD.PRO” software programs. The steel jacket is pushed astern with the push-pull equipment on the barge. Due to the shift of gravity centre the jacket changes the trim in the stern. Through the elevation of trim angle brought in alignment with the friction ration between the jacket and barge, the jacket slides further itself. Herewith, the trim increases until the gravity centre of steel jacket on the barge is not in alignment with rotation centre of the large rocker arms. The studies helped to fix the position of the jacket’s gravity centre from the aft perpendicular, the trim moment, the trim of the barge, the draft with the bow and stern and the trim angle as well.
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Dissertations / Theses on the topic "Offshore jacket platform"

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Righi, Bento Pereira Rafael. "Dynamic Analysis and Fatigue Assessment of a Jacket-type Offshore Platform." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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This work aims to evaluate the environmental loads and make the fatigue analysis in a Jacket-type platform situated in the North sea.Under this line of thought. Then, a static and a dynamic fatigue analysis are evaluated and compared.
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Rasekhafshar, Samsam. "Global Fatigue Assessment of a Decommissioned Jacket Platform for a Sustainable Reuse as an Offshore Wind Turbine." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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When the offshore oil and gas supplies exhaust, offshore platforms must be decommissioned and removed. The present thesis highlights the importance of evaluating the possibility of reuse of decommissioned offshore jacket platforms for offshore wind energy. In order to shift to the new structure, the topside must be removed from the substructure and a wind turbine can be installed in its place. The feasibility of this project was investigated using a finite element analysis software called Sesam. To study fatigue life in offshore structures, an exhaustive review of the background and state of the art was done. A finite element model was created by the means of Sesam and two different fatigue analysis approaches were applied and compared. In the end, an analysis methodology is suggested for the structural fatigue analysis of offshore wind turbine structures based on international standards, addressing the industry’s need to account for the combined effect of wind and hydrodynamic loads in these type of structures.
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Takavar, Sadegh. "Investigation of Vertical Axis Wind Tower Installation on Existing Offshore Platforms." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Jacket structures are the most common offshore tools for extraction of oil and natural gas in relative low water depth. Lots of these structures exist in Adriatic Sea and most of them have been constructed in the last 50 years. When the offshore oil and gas supplies exhaust, these structures must be relocated to another zone containing underwater resources or take them away if reaching the design life. Alternatively, another solution can be taken into account: altering the future working life of these platforms by bringing renewable energy into use and transforming them into offshore wind towers. The present thesis plans to study the possibility of shifting existing jackets to vertical axis wind turbine.
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Zarifkar, Marziyeh. "Investigation of Horizontal Axis Wind Tower Installation on Existing Offshore Platforms." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Jackets are the most common offshore structures used to extract oil and natural gas in relative low water depth specially, in Adriatic Sea. Most of them have been built in the last 50 years. When the offshore resources run out, these structures must be displaced to another area containing underground resources or removed in the case of reaching to the design life. However, another solution can be investigated: changing the future working life of these platforms by introducing renewable energy and converting them into offshore wind towers. This thesis intends to examine the possibility of changing existing offshore structures used for gas extraction to horizontal axis wind turbine.
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Ravipati, Venkata Raja Sekhar Reddy. "Design and modelling of boat landing for jacket platforms in the Adriatic sea." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Boat landings on fixed offshore platforms are designed to absorb the impact energy from the boats approaching the platform for crew transfer. As the size and speed of operating boats vary, the design and maintenance of the boat landings become more challenging. Different oil and gas operators adopt different design criteria for the boat landing design. The objective of this study is to develop structural calculations and safety checks regarding a boat landing structure installed on an Offshore Platform in Canale di Sicilia. The useful international codes are ISO 19902 and to carry out the structural modeling by means of GT STRUDL program, which is widely used in Europe. Calculate the defined loads such as dead loads, live loads, wave loads and Impact loads. The design calculations and checks done as per the international codes.
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Tedesco, Giacomo. ""Offshore tower or platform foundations: numerical analysis of a laterally loaded single pile or pile group in soft clay and analysis of actions on a jacket structure"." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6802/.

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Laterally loaded piles are a typical situation for a large number of cases in which deep foundations are used. Dissertation herein reported, is a focus upon the numerical simulation of laterally loaded piles. In the first chapter the best model settings are largely discussed, so a clear idea about the effects of interface adoption, model dimension, refinement cluster and mesh coarseness is reached. At a second stage, there are three distinct parametric analyses, in which the model response sensibility is studied for variation of interface reduction factor, Eps50 and tensile cut-off. In addition, the adoption of an advanced soil model is analysed (NGI-ADP). This was done in order to use the complex behaviour (different undrained shear strengths are involved) that governs the resisting process of clay under short time static loads. Once set a definitive model, a series of analyses has been carried out with the objective of defining the resistance-deflection (P-y) curves for Plaxis3D (2013) data. Major results of a large number of comparisons made with curves from API (America Petroleum Institute) recommendation are that the empirical curves have almost the same ultimate resistance but a bigger initial stiffness. In the second part of the thesis a simplified structural preliminary design of a jacket structure has been carried out to evaluate the environmental forces that act on it and on its piles foundation. Finally, pile lateral response is studied using the empirical curves.
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Dongsheng, Han, and rising_sun_han@hotmail com. "Robust Control for Offshore Steel Jacket Platforms under Wave-Induced Forces." Central Queensland University. School of Computing Sciences, 2008. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20080717.104813.

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This thesis is concerned with robust control of an offshore steel jacket platform subject to nonlinear wave-induced forces. Since time delay and uncertainty are inevitably encountered for an offshore structure and their existence may induce instability, oscillation and poor performance, it is very significant to study on how the delay and uncertainty affect the offshore structure. In this thesis, a memory robust control strategy is, for the first time, proposed to reduce the internal oscillations of the offshore structure under wave-induced forces, so as to ensure the safety and comfort of the offshore structure. Firstly, when the system's states are adopted as feedback, memory state feedback controllers are introduced for the offshore structure. By using Lyapunov-Krasovskii stability theory, some delay-dependent stability criteria have been established, based on which, and by combining with some linearization techniques, memory state feedback controllers are designed to control the offshore structure. The simulation results show that such controllers can effectively reduce the internal oscillations of the offshore structure subject to nonlinear wave-induced forces and uncertainties. On the other hand, a new Lyapunov-Krasovskii functional is introduced to derive a less conservative delay-dependent stability criterion. When this criterion is applied to the offshore structure, an improved memory state feedback controller with a small gain is obtained to control the system more effectively, which is sufficiently shown by the simulation. Secondly, when the system's outputs are adopted as feedback, memory dynamic output feedback controllers are considered for the offshore structure. By employing a projection theorem and a cone complementary linearization approach, memory dynamic output feedback controllers are derived by solving some nonlinear minimization problem subject to some linear matrix inequalities. The simulation results show that the internal oscillations of the offshore structure subject to nonlinear wave-induced forces are well attenuated. Finally, robust H control is fully investigated for the offshore structure. By employing Lyapunov-Krasovskii stability theory, some delay-dependent bounded real lemmas have been obtained, under which, via a memory state feedback controller or a dynamic output feedback controller, the resulting closed-loop system is not only asymptotically stable but also with a prescribed disturbance attenuation level. The simulation results illustrate the validity of the proposed method.
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Tsukamoto, Yoshimichi. "Drum centrifuge tests of three-leg jack-ups on sand." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360636.

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Mourão, António Manuel de Barros Figueiredo da Silva. "Fatigue Analysis of a Jacket-type Offshore Platform based on Local Approaches." Dissertação, 2018. https://repositorio-aberto.up.pt/handle/10216/115410.

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Mourão, António Manuel de Barros Figueiredo da Silva. "Fatigue Analysis of a Jacket-type Offshore Platform based on Local Approaches." Master's thesis, 2018. https://repositorio-aberto.up.pt/handle/10216/115410.

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Books on the topic "Offshore jacket platform"

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. Active Control of Offshore Steel Jacket Platforms. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2986-9.

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Nizamani, Zafarullah. Environmental Load Factors and System Strength Evaluation of Offshore Jacket Platforms. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15051-2.

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Offshore platform jackets and piles from the Republic of Korea and Japan: Determination of the Commission in investigation no. 701-TA-248 (preliminary) under the Tariff Act of 1930, together with the information obtained in the investigation, determinations of the Commission in investigation nos. 731-TA-259 and 260 (preliminary) under the Tariff Act of 1930, together with the information obtained in the investigations. Washington, DC: U.S. International Trade Commission, 1985.

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Han, Qing-Long, Bao-Lin Zhang, Xian-Ming Zhang, and Gong-You Tang. Active Control of Offshore Steel Jacket Platforms. Springer, 2018.

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Nizamani, Zafarullah. Environmental Load Factors and System Strength Evaluation of Offshore Jacket Platforms. Springer, 2016.

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Nizamani, Zafarullah. Environmental Load Factors and System Strength Evaluation of Offshore Jacket Platforms. Springer, 2015.

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Book chapters on the topic "Offshore jacket platform"

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Suryaprakash, V., and N. Sunil Kumar. "Optimization Study of Eight-Legged Fixed Offshore Jacket Platform." In Lecture Notes in Civil Engineering, 479–86. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3134-3_36.

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Mahanta, Rupam, and R. K. Ghanekar. "Pile Group Effect Analysis of a Group of 12 Conductors in an Offshore Jacket Platform." In Lecture Notes in Civil Engineering, 379–86. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2260-1_37.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Dynamic Models of Offshore Platforms." In Active Control of Offshore Steel Jacket Platforms, 17–31. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_2.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Introduction." In Active Control of Offshore Steel Jacket Platforms, 1–15. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_1.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Author Correction to: Active Control of Offshore Steel Jacket Platforms." In Active Control of Offshore Steel Jacket Platforms, C1. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2986-9_10.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Optimal Tracking Control with Feedforward Compensation." In Active Control of Offshore Steel Jacket Platforms, 33–48. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_3.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Integral Sliding Mode H∞ Control." In Active Control of Offshore Steel Jacket Platforms, 49–69. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_4.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Delayed Integral Sliding Mode Control." In Active Control of Offshore Steel Jacket Platforms, 71–89. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_5.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Delayed Robust Non-fragile H∞ Control." In Active Control of Offshore Steel Jacket Platforms, 91–108. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_6.

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Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Delayed Dynamic Output Feedback Control." In Active Control of Offshore Steel Jacket Platforms, 109–29. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_7.

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Conference papers on the topic "Offshore jacket platform"

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Jin, Wei-Liang, Yong He, Shun-Feng Gong, and Jian Song. "System Reliability-Based Assessment on Single Point Mooring Jacket Platform." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67535.

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The Single Point Mooring (SPM) jacket platforms have been developed over the last several decades and are widely applied in the exploitation of offshore oil-gas resources. The SPM jacket platforms are continuously subjected to environmental loads due to wave, current, wind and mooring force. As the uncertainty of those loads, the system reliability research of SPM jacket platforms is one of the most important research areas. A methodology of system reliability-based assessment of the SPM jacket platform was introduced in this paper and applied for the assessment of BZ28-1 SPM jacket platform. According to nonlinear mechanical analysis, the mechanics characteristics of SPM jacket platform subjected to extreme loads were analyzed on considering pile-soil-structure nonlinear interaction. Based on the FEM model, with Monte Carlo simulation, the reliability of SPM jacket platform was studied, and the system reliabilities in 20-year-based-period and 50-year-return-period were calculated respectively. The results show that the statistical analysis of parametric variables based on 50-year return period is appropriate, and the mooring forces due to wave are the predominant loads for SPM jacket platforms. The system reliability-based assessment method can provide important and reliable referential suggestions for the design, maintenance and repair of SPM jacket platforms.
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Jin, Wei-Liang, Yong He, and Shun-Feng Gong. "System Reliability-Based Assessment on Existing Jacket Platform." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92562.

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A great deal of existing jacket platforms need to be assessed in order to determine whether they can be reused or not. In allusion to the differences between the existing service platforms and the drafting ones, a methodology of system reliability-based assessment of existing jacket platform is presented and is applied for the assessments of BZ28-1 three jacket platforms which have operated for sixteen years. In terms of nonlinear mechanical analysis, correcting the statistical parameters of the sea states and considering pile-soil-structure nonlinear interaction, the mechanics characteristics of three jacket platforms subjected to extreme loads were analyzed. Based on the FEM model, with Monte Carlo simulation, the reliability of the platforms was studied. From the practical application, the method can be used to estimate the service life of the existing platforms and ensure their secure operation.
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Azimirad, M., A. R. M. Gharabaghi, and M. R. Chenaghlou. "Deterministic-Spectral Fatigue Analysis of a Typical Jacket Platform (SPD1) Using Directional Wave Spectrum." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29418.

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Fixed offshore platforms or Jacket type platforms are the most common offshore structures used for oil & gas Exploration & Production industry in Persian Gulf, because water depth is such that the shallow water condition is dominant. Sea waves as dominant environmental loading are cyclic and have random nature. The applied cyclic sea wave forces will lead to fatigue damages in jacket’s joints. There are different methods to investigate the fatigue life of jackets such as deterministic method, simplified method, spectral method and transient method. Spectral method is a suitable method, which can consider the random nature of sea waves in fatigue analysis. Deterministic-spectral method developed by Bishop et al. is used to estimate the fatigue life of shallow water jacket platforms. However, in this method the frequency spectrum of waves is used in the analysis, but generally sea waves are propagating in different directions with different frequencies, so directional wave spectrum can consider wave randomness more properly. In this paper, frequency domain spectral method using Deterministic-Spectral approach has been used to estimate the fatigue life of a typical jacket platform (SPD1 at South Pars Field - Persian Gulf). Base wave cases were chosen from joint histogram of height & period that is calculated based on scatter diagrams of South Pars Field. First the jacket was modeled by ANSYS software, then by applying base wave cases to it and analyzing the critical TT joint under internal cyclic forces, hot spot stress transfer functions at 8 nodes around the intersection of joint were obtained. Using JONSWAP standard spectrum and the spreading function proposed by Goda, sea state’s Power Spectral Densities (PSD) and directional spectrums are multiplied to obtain stress spectra. The fatigue damage and fatigue life then are calculated. Results indicate that the fatigue life based on frequency spectrum is less than the fatigue life based on directional spectrum.
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Ji, Chunyan. "Experimental Studies on Semi-Active Vibration Control of Jacket Platforms With Magnetorheological Damper." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79847.

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Jacket platforms are inevitably undergoing the environmental loads such as wind, waves, current, ice and earthquake etc., which will induce continuous vibration of the platforms. The vibration, on one hand, will cause fatigue damage, decreasing the platform’s reliability; on the other hand, the excessive vibration can’t satisfy the basic psychological requirements of the personnel. In order to reduce the excessive vibration of jacket platforms effectively, many control strategy and control equipments are proposed and studied. In the present study, a model experiment is designed to investigate the effectiveness of semi-active vibration control system with Magnetorheological (MR) Damper. A typical jacket offshore platform in Mexico Gulf is selected as experimental prototype. The model of the jacket platform is designed based on dynamical similarity criterion by the scale of 1:50. Furthermore, the optimal semi-active system of MR damper is designed by fuzzy control theory. In order to investigate the control effect of MR damper on the jacket platform under regular and random wave state, several model experiment load cases are performed. The experimental results show that the MR system designed by fuzzy theory can reduce the vibration of the platform effectively and in the same time the control effect is stable.
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Srikanth, Ishwarya, and M. Arockiasamy. "Integrated Probabilistic-Mechanistic Deterioration Modeling for Preventive Maintenance of Aging Fixed Offshore Jacket-Type Platforms." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18927.

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Abstract Most of the offshore platforms in the world are designed as steel jacket-type platforms for oil and gas exploration and production. A significant amount of research has been carried out over the past two decades to understand ageing and the associated degradation of offshore structural members. The paper proposes an approach for prioritization and preventive maintenance of jacket-type platform. Offshore platform maintenance systems are dependent on deterioration models to predict the future condition of structural elements. The input for these models consists of condition states of different jacket elements and their evolution as a function of time. One of the challenges includes lack of availability of condition state records for the aging platforms. This paper proposes a methodology for developing deterioration models when there is a scarcity of inspection records. This study focusses on developing a methodology for i) the impact ranking of different bracing member groups of the jacket platform and ii) deterioration models using integrated probabilistic-mechanistic modeling. Firstly, a typical jacket-type offshore platform under the North Sea conditions is modeled and analyzed under wave and current loads. Then, nonlinear static (pushover) analyses are performed for the undamaged jacket platform. The criticality of the different groups of bracing elements is obtained in terms of Residual Resistance Factor by carrying-out redundancy analyses. Soil-structure interaction effect is considered in the analyses and the results are compared with the hypothetical fixed-support end condition. The member groups are then ranked based on their impact on the ultimate strength of the jacket platform. Secondly, deterioration models for jacket legs and bracings in splash and immersion zones are obtained based on integrated mechanistic-probabilistic approach. An idealized uniform corrosion model is used in generating the member condition state probabilities. Condition state probabilities for jacket legs and bracings are then generated using Monte Carlo simulations. The residual service life of the jacket elements is predicted from the deterioration models which could be utilized for preventive maintenance of the jacket platform.
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Gu, G. Z., M. A. Parsley, E. P. Berek, J. J. Calve, R. C. Johnson, and D. J. Petruska. "Model Test of Wave Forces On A Structurally Dense Jacket Platform." In Offshore Technology Conference. Offshore Technology Conference, 1996. http://dx.doi.org/10.4043/8065-ms.

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Chan, Hoi-Sang, Christina Krachtoudi, Luca De Lorenzi Cavallari, and Gordon Clark Carlile. "Development of Topsides and Jacket Removal Programme for Miller Platform Decommissioning." In Offshore Technology Conference. Offshore Technology Conference, 2020. http://dx.doi.org/10.4043/30496-ms.

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Dyanati, Mojtaba, and Qindan Huang. "Seismic Reliability of a Fixed Offshore Platform Against Collapse." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24137.

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As many jacket type steel platforms have been constructed in the highly active seismic area, seismic reliability evaluation of such structures is desirable. Ultimate limit state (ULS) with base shear capacity and demand can be used to estimate seismic performance of fixed offshore platform against collapse. Base shear capacity is evaluated from pushover analysis on a 3D finite element model of the offshore structure using different load patterns. Base shear demand is calculated from spectral acceleration at a given site and the total mass of the platform. Uncertainties are considered in both capacity and demand evaluations. With the limit state function, seismic fragility of a prototype structure is assessed using reliability analysis. The results indicate that various load patterns affect the seismic performance evaluation. It is also found that the steel yield stress is a critical parameter in the reliability of the steel jacket platforms.
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Agheshlui, Hossein. "Effect of Bracing Configurations on the Lateral Behavior of Jacket Type Offshore Platforms, Considering Pile-Soil-Structure Interaction." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20010.

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The configuration of braces has a considerable influence in the lateral behavior of pile supported steel jacket type offshore platforms. In this paper nonlinear static push over analyses and hysteresis curves are used to investigate lateral behavior of a jacket type offshore platform considering different configurations for vertical bracings of the jacket. One sample platform, constructed in Persian Gulf, is precisely modeled using the finite element program Opensees. Since the lateral response of offshore platforms is completely dependent on their foundations’ behavior, an accurate model is used for modeling the foundation of this structure. Soil-pile-structure interaction is considered using Beam on Nonlinear Winkler Foundation model (BNWF). Lateral and vertical soil stiffness and end bearing were considered using p-y, t-z and q-z nonlinear models, respectively. Moreover, the buckling behavior of the braces is considered in the simulation of the platform to consider the behavior of the platform after buckling, and redistribution of the shear forces in the structure due to the bracings failures. The structure was modeled using nonlinear beam-column elements which have the ability to consider the spread of plasticity along the elements. The sections used for elements are fiber sections which are suitable for considering composite section of pile-grout-leg. Displacement controlled nonlinear static pushover analysis and cyclic loading analysis are conducted applying lateral load which its pattern is according to the predominant vibration modes. Three different configurations for lateral bracings are assumed and the behavior of the platform using these three bracing forms is investigated. The first configuration considered is the original bracing of the platform which is a combination of X and chevron braces; the second one is a case in that X braces were used in all of the bays of the jacket; and in the third form chevron braces are used for all of the bays. According to the push over and hysteresis curves, it is concluded that in the jacket modeled using X vertical braces, lateral load capacity, ductility, residual strength ratio and the absorbed energy in cyclic loadings are considerably more than the jackets which were modeled using a combination of chevron and X braces or just chevron braces. In comparison with the jacket modeled using only chevron braces, the jacket constructed using a combination of X and chevron bracings presents better lateral behavior and capacity.
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Asgarian, B., and M. M. Amiri. "Effect of Structural Member Uncertainties in the Jacket Type Offshore Platform Assessments." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92250.

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In the assessment of an old jacket type offshore platform, the Reserve Strength Ratio (RSR) should be computed and it is used for accepting or rejecting the platform for the future. There are many parameters affecting the Reserve Strength Ratio of such a structure. One of the important parameter is the bias factor (Br) of the structural element ultimate capacity. The bias factor is defined as the ratio of best estimate or true values to the nominal or predicted values. This parameter must be obtained for all structural elements including bracing members (in buckling or tension), joint strength, and piles lateral capacity by considering actual behavior of element material. Most of the recommended bias factors for the structural elements are evaluated from experimental results. In this paper, a review on the parameters affecting Reserve Strength Ratio of the Jacket Type Offshore Platforms subjected to Metocean loading is performed and a method is presented for the obtaining of bias factor related to structural element capacity. The method is applied to evaluate assessment of three sample platforms in the Persian Gulf. The results in terms of RSR are compared with the analysis results using previous recommended bias factors.
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