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Letteratura scientifica selezionata sul tema "Off-shore structures"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Off-shore structures"

1

Mortada, Mohamed, Mohamed Ahmed, Mohamed Morad e Ahmed Alkaisy. "Sediment Transport Fields Around Off-Shore and On-Shore Structures". Fayoum University Journal of Engineering 4, n. 2 (1 giugno 2021): 139–56. http://dx.doi.org/10.21608/fuje.2021.205539.

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Hanzawa, Minoru, Akira Matsumoto e Hitoshi Tanaka. "STABILITY OF WAVE-DISSIPATING CONCRETE BLOCKS OF DETACHED BREAKWATERS AGAINST TSUNAMI". Coastal Engineering Proceedings 1, n. 33 (15 ottobre 2012): 24. http://dx.doi.org/10.9753/icce.v33.structures.24.

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In recent years, the risk of occurrence of tsunamis generated by near shore earthquakes, such as, Tokai, Tonankai, Nankai and off-Miyagi is considered to be higher than before, as well as off shore tsunamis traveling long distances, e.g., the 2010 Chilean tsunami. On March, 11th, 2011 the huge, devastating tsunami generated by The 2011 off the Pacific coast of Tohoku Earthquake attacked and damaged the east coast area of Japan. Tsunami forces onto vertical walls, such as seawalls, has already been studied in detail, e.g., Asakura et al.(2002) and Kato et al.(2006). In Japan, detached breakwaters made with wave-dissipating concrete blocks such as Tetrapods have been widely applied. However, the effects of detached breakwater on tsunami disaster mitigation have not been studied. In our study, hydraulic model tests have been systematically and carefully carried out using solitary tsunami waves to evaluate the stability of concrete blocks following the our previous study on the effect of detached breakwaters from the viewpoint of reducing run-up and wave pressure onto seawalls behind the detached breakwaters (Hanzawa et al., 2011).
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Salvadori, Gianfausto, Giuseppe Roberto Tomasicchio e Felice D'Alessandro. "Multivariate approach to design coastal and off-shore structures". Journal of Coastal Research 65 (2 gennaio 2013): 386–91. http://dx.doi.org/10.2112/si65-066.1.

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4

Ragab, Ahmed, e Chung C. Fu. "Nonlinear free vibration of fixed off-shore framed structures". Computers & Structures 21, n. 6 (gennaio 1985): 1373–78. http://dx.doi.org/10.1016/0045-7949(85)90191-9.

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5

Tomasicchio, Giuseppe Roberto, Elvira Armenio, Felice D'Alessandro, Nuno Fonseca, Spyros A. Mavrakos, Valery Penchev, Holger Schuttrumpf, Spyridon Voutsinas, Jens Kirkegaard e Palle M. Jensen. "DESIGN OF A 3D PHYSICAL AND NUMERICAL EXPERIMENT ON FLOATING OFF-SHORE WIND TURBINES". Coastal Engineering Proceedings 1, n. 33 (14 dicembre 2012): 67. http://dx.doi.org/10.9753/icce.v33.structures.67.

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Abstract (sommario):
The knowledge of the behavior of floating offshore wind turbines (W/T) under wave and/or wind action remains one of the most difficult challenges in offshore engineering which is mostly due to the highly non-linear response of the structure. The present study describes the design process of a 3D physical experiment to investigate the behavior of the most promising structure technology of floating W/T: spar buoy (SB) and tension leg platform (TLP) under different meteo conditions. In order to properly design the two W/T models, the following topics have been analyzed: mooring lines, mass distribution, appropriate scaling factor and data relative to the geometrical characteristics, wave basin dimensions and wind and waves conditions. In addition, the Smoothed Particle Hydrodynamics method (SPH) (Monaghan 1994) has been considered to simulate the 3D behavior of a floating offshore W/T. In particular, the SPH, calibrated and verified on the basis of the experimental observations, may represent a reliable tool for preliminary test of changes in the floater geometry.
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Moarefzadeh, M. R., e R. E. Melchers. "Sample-specific linearization in reliability analysis of off-shore structures". Structural Safety 18, n. 2-3 (gennaio 1996): 101–22. http://dx.doi.org/10.1016/0167-4730(96)00014-8.

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Emi, Hirohiko, Michifumi Yuasa, Atsushi Kumano, Hiroyuki Kumamoto, Norio Yamamoto e Masaki Matsunaga. "A Study on Life Assessment of Ships and Off-shore Structures". Journal of the Society of Naval Architects of Japan 1992, n. 172 (1992): 627–35. http://dx.doi.org/10.2534/jjasnaoe1968.1992.172_627.

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Emi, Hirohiko, Michifumi Yuasa, Atushi Kumano, Toshirou Arima, Norio Yamamoto e Masatoshi Umino. "A Study on Life Assessment of Ships and Off-Shore Structures". Journal of the Society of Naval Architects of Japan 1993, n. 174 (1993): 735–44. http://dx.doi.org/10.2534/jjasnaoe1968.1993.174_735.

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WEST, BRUCE J. "EXTREMA OF FRACTAL RANDOM WATER WAVES". International Journal of Modern Physics B 10, n. 01 (10 gennaio 1996): 67–132. http://dx.doi.org/10.1142/s0217979296000052.

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Herein we review the statistical properties of the visibly random behavior of sea waves and the resulting stochastic forces loading off-shore structures and ships. The traditional assumption is that the statistics of the sea surface displacement produced by waves is Gaussian, or equivalently that the statistics of the wave amplitudes are Rayleigh. We examine this and a more general statistical hypothesis in this review, that being that the statistics of surface waves are Lévy stable, and investigate the response of dynamical models of off-shore structures to such stochastic forcing. We find that such familiar results as the Weibull distribution for the failure of a dynamical system may be a consequence of the statistics of the driver rather than any nonlinearity in the structure response.
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Lin, Jung-Tai. "EMPIRICAL PREDICTION OF WAVE SPECTRUM FOR WIND-GENERATED GRAVITY WAVES". Coastal Engineering Proceedings 1, n. 20 (29 gennaio 1986): 36. http://dx.doi.org/10.9753/icce.v20.36.

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Wind-Generated gravity wave has been of great interest to researchers and engineers in the field of coastal engineering because it is one of the important considerations in the engineering studies and designs for ship navigation, coastal and off-shore structures, shore protection, oil pollution control, and wave energy conversion. An accurate prediction of the wave height, wave frequency, and wave spectrum is critical to the success of these engineering studies and design.
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Più fonti

Tesi sul tema "Off-shore structures"

1

Alamdari, Mikayil. "Corrosion protection and monitoring of off-shore structures". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Abstract (sommario):
Oil and gas platforms are confronting a problem of ageing as there are many platforms that were constructed over 40 years ago. Every year, the offshore sector incurs considerable losses due to corrosion. On average, oil and gas companies use 6% of their annual income to fight against corrosion. This all in a short-term has a negative impact on the marine environment and in a long-term endeavour toward sustainable energy encountering difficulties. This thesis presents a novel corrosion inspection method by the implementation of the deep neural network and fuzzy logic models. Fuzzy logic is a suitable mathematical tool for the task since it is capable of handling imprecise information from the real world. The benefit of this approach lies in its ability to include personal experiences and acceptable deterministic models in the calculations. This approach can thus help to reduce the dependence upon the precise data, allow modelling even when a phenomenon is incompletely understood, and lessen the difficulties arising due to the complex computation required by more traditional methods. Moreover, image processing based on algorithms can do the automated inspection of external corrosion phenomena. A complete automated system for corrosion detection in pipelines comprises of a drone to flying over these pipelines and capturing photos and/or videos, and an image based on an algorithm to process these visual data and detect corrosion. The proposed deep learning approach effectively wards off the need for manual inspection and other non-vision based non-destructive evaluation techniques for pipeline corrosion which are cost-ineffective and interrupts the functioning of pipelines. Increased production frequently comes with an unknown cost of the increased rate of material degradation and threatening corrosion failures. Therefore, essential topics as corrosion data management and risk assessment are covered.
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Moustafa, Ahmed Attia Ahmed. "The numerical analysis of turbulent flow around off-shore structures". Thesis, University of Strathclyde, 1988. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21491.

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This study provides the physical, mathematical and numerical basis of analysis work performed for predicting the flow around three-dimensional bluff body configurations. The flow has been treated as steady, incompressible, turbulent. The predictions were made using a two-equation turbulence model, solving transport equations for turbulence kinetic energy K and the turbulence dissipation rate ε, in addition to the partial differential equations for the conservation of mass and momentum. The program used was the well tested computer code "PHOENICS-84" based on work conducted by Prof. D.B. Spalding and Co-workers. Several computations have been performed, for three models: a single cube, a pair of cubes with different spacing, and a rudimentary representation of an offshore oil platform stucture. The prediction procedure was first tested for grid refinement and optimum solution domain size until profiles at several locations for selected variables showed little change with further increase of domain size and grid points. The effect of different wind directions was investigated for the three models; in addition, different pitching conditions of the oncoming flow were also considered for the platform-model configurations. Comparisons were made with wind tunnel test results on the same three models, and some discrepancies are noted, particularly in regions of separated, recirculating flow. Also comparisons were made with certain empirical calculation procedures used for wind load estimation in maritime engineering. Overall wind loading is nevertheless reasonably well predicted. Applications of the method in the area of wind loadings on a full scale offshore oil rig is discussed, and plans for refinement and extension of the present work are outlined. It is concluded that the present method can be used as a suitable starting point for generating a platform aerodynamics simulator. However, more work is required to this end, in order to represent adequately all aspects of platform-aerodynamics phenomena.
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Abdulaziz, Mohammed [Verfasser], e Bettar Ould el [Akademischer Betreuer] Moctar. "Study of the vortex-induced vibrations in off-shore structures / Mohammed Abdulaziz ; Betreuer: Bettar Ould el Moctar". Duisburg, 2017. http://d-nb.info/1136864032/34.

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4

Zhao, Hongyi. "Numerical Analysis of Wave-induced Seabed Response in the Vicinity of Marine Structures". Thesis, Griffith University, 2017. http://hdl.handle.net/10072/365468.

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Abstract (sommario):
Knowledge and understanding of wave-induced dynamic soil response are of particular importance for marine geotechnical engineers involved in the design of the foundation for marine infrastructures such as breakwaters, platforms, pipelines and offshore wind turbines. In general, the nonlinearity of deformation occurring in loosely deposited sand foundations with a low relative density, and a low standard penetration test (SPT) value can presumably lead to the build-up of pore water pressures of foundation soil as a result of its plastic volumetric contraction under cyclic shearing. Liquefaction occurs when the accumulated pore pressure overcomes the overburden pressure, making the soil grains become unbound and completely free. The liquefied seabed soil will behave like a kind of heavy fluid without any shear resistance to supported submarine infrastructures, thusleading to catastrophic consequences such as the collapse of platforms and breakwaters, and sinking or floatation of submarine pipelines. In the present study, a theoretical framework is implemented to understand the relevant physical processes associated with wave-seabed-structure interaction, with a focus on the assessment of potential risks for failure of marine structures caused by liquefaction occurring in its loosely deposited sand foundations.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
Full Text
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Brahmachari, Koushik, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty e School of Construction and Building Sciences. "Connection and flexural behaviour of steel RHS filled with high strength concrete". THESIS_FTA_CBS_BRAHMACHARI_K.xml, 1997. http://handle.uws.edu.au:8081/1959.7/526.

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Steel hollow section members filled with concrete have been frequently used in recent construction industry as columns and beams and beam-columns because of their superior performance and constructability. Previous research demonstrated that such system has large energy absorption capacity which is critical in the event of an earthquake. By filling steel RHS with concrete, the failure of the steel shell due to local buckling can be delayed and the ductility of the concrete core can be improved as a result of the confinement of the steel shell. This type of composite section may be used in various structures including frames of high rise buildings, bridges, offshore structures, cast-in-situ piles in foundation etc. Design methods for concrete-filled steel tubular sections are recommended in a number of code of practices. Due to the significant differences in the material properties between normal strength concrete and high strength concrete, there is a need to study the behaviour of composite sections with higher strength concretes. The study emphasises ultimate strength, ductility, post-failure strength reserve and interface bond. It also emphasises ductility and post-failure strength of the composite beams due to the brittle behaviour of higher strength concretes when compared to normal strength concrete. Spreadsheet graph were used to present the results such as load versus strains, load versus deflections etc. In this thesis analytical study is presented on the calculation of ultimate moment of resistance of the concrete-filled RHS beams. Among the main considerations of the derivation, the steel portion was assumed either elastic-perfectly plastic or perfectly plastic and concrete carries no strength in the tensile zone. At the interface both full bond and partial bond were assumed for comparison. Efforts were also made to calculate the midspan deflections of the composite beams. Simple analytical expressions derived from this study can be coded to a prgrammable calculator or in a small spreadsheet program for design use. Finite element studies were carried out by using a proprietorship software package ANSYS. In the analysis of concrete-filled, three types of elements with large deformation and nonlinear capabilities were used. A plastic shell element, a solid concrete element with cracking and crushing capabilities, and a nonlinear spring contact element were used to model the steel shell, the concrete core and the interface respectively.
Doctor of Philosophy (PhD)
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Brahmachari, Koushik. "Connection and flexural behaviour of steel RHS filled with high strength concrete". Thesis, View thesis, 1997. http://handle.uws.edu.au:8081/1959.7/526.

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Abstract (sommario):
Steel hollow section members filled with concrete have been frequently used in recent construction industry as columns and beams and beam-columns because of their superior performance and constructability. Previous research demonstrated that such system has large energy absorption capacity which is critical in the event of an earthquake. By filling steel RHS with concrete, the failure of the steel shell due to local buckling can be delayed and the ductility of the concrete core can be improved as a result of the confinement of the steel shell. This type of composite section may be used in various structures including frames of high rise buildings, bridges, offshore structures, cast-in-situ piles in foundation etc. Design methods for concrete-filled steel tubular sections are recommended in a number of code of practices. Due to the significant differences in the material properties between normal strength concrete and high strength concrete, there is a need to study the behaviour of composite sections with higher strength concretes. The study emphasises ultimate strength, ductility, post-failure strength reserve and interface bond. It also emphasises ductility and post-failure strength of the composite beams due to the brittle behaviour of higher strength concretes when compared to normal strength concrete. Spreadsheet graph were used to present the results such as load versus strains, load versus deflections etc. In this thesis analytical study is presented on the calculation of ultimate moment of resistance of the concrete-filled RHS beams. Among the main considerations of the derivation, the steel portion was assumed either elastic-perfectly plastic or perfectly plastic and concrete carries no strength in the tensile zone. At the interface both full bond and partial bond were assumed for comparison. Efforts were also made to calculate the midspan deflections of the composite beams. Simple analytical expressions derived from this study can be coded to a prgrammable calculator or in a small spreadsheet program for design use. Finite element studies were carried out by using a proprietorship software package ANSYS. In the analysis of concrete-filled, three types of elements with large deformation and nonlinear capabilities were used. A plastic shell element, a solid concrete element with cracking and crushing capabilities, and a nonlinear spring contact element were used to model the steel shell, the concrete core and the interface respectively.
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Dombre, Emmanuel. "Modélisation non-linéaire des interactions vague-structure appliquée à des flotteurs d'éoliennes off-shore". Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1050/document.

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Cette thèse est consacrée à l'étude numérique des interactions non-linéaires entre des vagues et un corps rigide perçant la surface libre. La méthode développée repose sur un modèle d'éléments de frontière qui réduit la dimensionnalité du problème d'une dimension. Dans un premier temps, un modèle2D est appliqué à des géométries simples et permet de démontrer la pertinence de l'approche envisagée pour la prédiction des mouvements d'une structure flottante soumise à des vagues monochromatiques régulières. Dans un second temps, en nous inspirant d'un modèle potentiel non-linéaire 3D développé par Grilli textit{et al.}~cite{grilli2001fully}, nous proposons une généralisation de la méthode pour des maillages triangulaires non-structurés de surfaces 3D. Le modèle développé permet de traiter des configurations arbitraires de plusieurs cylindres verticaux en interaction avec les vagues. Nous présentons des cas de validation de nature académique qui permettent d'apprécier le comportement du modèle numérique. Puis nous nous tournons vers l'application visée par EDF R&D, qui concerne le dimensionnement d'éoliennes off-shore flottantes. Un flotteur de type semi-submersible est évalué à l'aide du modèle non-linéaire
This PhD work is devoted to the study of nonlinear interactions between waves and floating rigid structures. The developed model relies on a boundary element method which reduces the dimensionality of the problem by one. First, a 2D model is applied to basic geometries and allows us to demonstrate the validity of the method for predicting the motion of a floating structrure subject to incoming monochromatic regular waves. Secondly, getting inspired by the 3D fully nonlinear potential flow model of Grilli textit{et al.}~cite{grilli2001fully}, we propose a novel model which generalizes the method for unstructured triangular meshes of 3D surfaces. The proposed model is able to deal with arbitrary configurations of multiple vertical cylinders interacting with the waves. We present academic validation test cases which show how the model works and behaves. Finally, we study situations of interest for EDF R&D related to floating off-shore wind turbines. A semi-submersible platform is evaluated with the nonlinear model
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8

Alaydrus, Achmad F. "Salvaging and re-using jacket and deck structures of fixed off-shore oiland as production platforms". 1994. http://catalog.hathitrust.org/api/volumes/oclc/32717228.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1994.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 103-106).
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9

Wang, Wei-Chih, e 王威智. "Dynamic analyses of pile foundation for supporting structure of off-shore wind turbine at Changhua coast in Taiwan". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/96469910519323998492.

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碩士
國立中興大學
水土保持學系所
104
This study use the actual measurement data of the wind farm at Chang-Hua coast of western Taiwan, then under the simulation by three-dimensional (3-D) finite element program Plaxis 3-D. This study investigates the dynamics reactions and mechanical behaviors of pile foundation installed on the seabed of wind farm near Chan-Hua coast of western Taiwan for the supporting structure of offshore wind turbine. Firstly, using the boring logs, SPT-N values, and laboratory tests of undisturbed samples from the wind farm, one can estimate the required material model paramters of soil strata for numerical model. In addition, consulting the commonly used interanational design criteria and recent case histories, one can preliminarily determine the combined design loading and pile geometries which are appropriate for the environments of wind farm selected for the installation of offshore turbine. Secondly, numerical analyses were performed on lateral loading tests of monopile in laboratory and the shaking table of monopile, then compare the results between the simulation and measurement of the tests were made to calibrate the required soil/pile material model parameters. The comparisons show that the simulations of H~h curves, lateral displacement, bending moment distribution of pile shaft, and the acceleration of the pile head are in excellent agreement with the measurements. In addition, the numerical results indicate the utilizatons of Mohr-Coulumn soil model, Hardening soil model with small strain and embedded pile structural element enable a satisfactory simulation of the soil/pile interaction behaviors when subjected to the lateral loading and the acceleration loading. Subsequently, 3-D numerical models of monopile for offshore turbine were constructed to simulate the soil/pile interaction behaviors subjected to various combined loadings. In numerical model, various pile length L, wind loading Fwind and wave loading Fwave were selected as design parameters to inspect their effects on the dynamic reactions and deformation behaviors of pile foundation. For different design parameters, which includes three pile lengths (L=30, 40, and 50 m) various depth~displacement curves, the various bending moment of pile curve, the acceleration curve and the displacement duration curve of pile head. In addition, a dynamic simulation was carried out on a monopile whne subjected to earthquake loading to inspect the soil/pile interaction responses. Based on the numerical results, several conclusions can be made:(1) In the process of the simulation on a monopile with vertical static loading and lateral cyclic loading, the influence area of the strata will be larger along with the larger loading. And the mega deformations will appear at the upper strata area.(2) There is nearly no impact on the pile displacement by changing the pile length.(3) As the wind loading constantly getting larger, the displacement and bending moment of pile will become larger. The pile will be easily to meet the tensile failure, and the position of the maximum bending moment will be at the depth L /5 ~ L /3.(4) when the wave loading getting bigger, the displacement and bending moment of pile will become larger. The position of the maximum bending moment will be at the depth 2 L/5 ~2 L/3.(5) During the earthquake simulations, the position range of pile bending moment is between the depth 2 L/5 ~3 L/5.
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Huang, Jhih-Min, e 黃智民. "Mechanical and deformation analyses of pile foundation for supporting structure of off-shore wind turbine at Changhua coast in Taiwan". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/15092353718954012020.

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Abstract (sommario):
碩士
國立中興大學
水土保持學系所
103
According to the numerical results of pile loading test performed on three soil profiles determined by soil boring logs obtained from the wind farm near Chan-Hua coast of western Taiwan, the E-E'' soil profile which gave the lowest bearing capcity of single pile was utilized as the representive profile for the subsequent analyses. This study investigates the bearing capacities and mechanical behaviors of pile foundation installed on the seabed of wind farm near Chan-Hua coast of western Taiwan for the supporting structure of offshore wind turbine by three-dimensional (3-D) finite element program Plaxis 3-D. Firstly, using the boring logs, SPT-N values, and laboratory tests of undisturbed sampes from the wind farm, one can estimate the required material model paramters of soil strata for numerical model. In addition, consulting the commonly used interanational design criteria and recent case histories, one can preliminarily determine the combined design loading and pile geometries which is appropriate for the environments of wind farm selected for the installation of offshore turbine. Secondly, numerical analyses were performed on two lateral loading tests of single model pile in laboratory and the comparisons between the simulation and measurement of the tests were made to calibrate the required soil/pile material model parameters. The comparisons show that the simulations of H~h curves (lateral loading H vs. lateral displacement h), lateral displacement, and bending moment distribution of pile shaft are in excellent agreement with the measurements. In addition, the numerical results indicate the utilizatons of Mohr-Coulumn soil model and embedded pile structural element enable a satisfactory simulation of the soil/pile interaction behaviors when subjected to lateral loading. Subsequently, 3-D numerical models of single pile and pile group foundations for offshore turbine were constructed to simulate the soil/pile interaction behaviors subjected to various combined loadings. In numerical model, various pile diameter D, pile length L, and pile spacing S were selected as design parameters to inspect their effects on the bearing capacities and deformation behaviors of pile foundations. For different design parameters, which includes five pile diameters (D=1.0, 1.5, 2.0, 2.5, and 3.0 m), three pile lengths (L=30, 40, and 50 m), three pile spacings (S=12, 16, and 20 m), three pile length/pile diameter ratios (=L/D=15, 20, and 25), and three pile spacing ratios (R=S/D=6, 8, and 10), various loading~displacement curves, ultimate bearing capacities, ultimate bearing capcity envelopes on the V-H (Vertical-Horizontal combined loading ) plane, and the p-y curves can be determined under various combined loading conditions. In addition, a dynamic simulation was carried out on a pile group whne subjected to earthquake loading to inspect the soil/pile interaction responses. Finally, under the action of vertical, horizontal and bending moment combined loadings, a V-H-M 3-D ultimate bearing capacity envelopes can be determined and applied to evaluate the stability of pile foundation for offshore turbine when subjected to various working loads. Based on the numerical results, several conclusions can be made: (1) Large displacement and plastic points at ultimate state mostly distribute and concentrate in the topsoil of seabed and around pile head. (2) The soil resistance at the soil/pile interface for lateral loading will ascend with the increases of depth, pile diameter and pile length. The gradient of p-y curve and ultimate bearing capacity for pile group is obviously higher than that of single pile. (3) The vertical, horizontal, and bending moment bearing capacities of sigle pile and pile group will be largely promoted with the increase of pile diameter. (4) For single pile, the vertical bearing capacity will be promoted notably with the increasing pile length. On the other hand, for pile group, the vertical and bending moment bearing capacities will be greatly promoted with the increasing pile length whereas the horizontal bearing capacity is almost insensitive to the pile length. (5) The influencial extent of spacing on the various bearing capacities of pile group from high to low in sequence is: bending moment loading  horiztonal loading > vertical loading. Especialy, the bending moment bearing capacity of pile group is highly influenced by the pile spacing. (6) For different design parameters, the shapes of ultimate bearing capacity envelopes of pile group on V-H plane is similar while the envelopes will expand as the magnitude of design parameter increases. (7) For different loading levels of bending moment, the ultimate bearing capacity envelopes on V-H plane will contract as the bending moment loading gradually increase. In addition, when the bending moment loading reachs ultimate value, namely, M=Mult, the ultimate bearing capacity envelopes on V-H plane will contract into the origin of V-H-M space or coordinate system (0,0). (8) For the Vult-Hult-Mult (or V-H-M) 3-D ultimate bearing capacity envelope surface (or ultimate bearing capacity space), the pile foundation situates in a stable state if the coordinate of combined loading (V, H, M) falls inside the envelope surface. Further, the pile foundation situates in a critical state if the coordinate of combined loading falls on the envelope surface. Eventually, the pile foundation fails if the coordinate of combined loading falls outside the envelope surface.
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Libri sul tema "Off-shore structures"

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Duhamel, Grégoire. Les paradis fiscaux: Palmarès comparé des paradis fiscaux, structures anti-impôts, les dispositifs off-shore à la loupe. 2a ed. Paris: Grancher, 2001.

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2

CADMO 86 (1986 Washington, D.C.). Cadmo 86: Proceedings of the International Conference on Computer Aided Design, Manufacture and Operation in the Marine and Off-shore Industries, Washington DC, U.S.A., September 1986. A cura di Keramidas G. A. 1943-. Berlin: Springer-Verlag, 1986.

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3

Marine Practice for Large Off Shore Structures. Amer Society of Civil Engineers, 1991.

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Capitoli di libri sul tema "Off-shore structures"

1

Brebbia, C. A. "Random Response Analysis of Off-Shore Structures". In Vibrations of Engineering Structures, 280–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82390-9_17.

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Suresh, R., K. Mullai Vendhan, K. Anbhazhagan, M. V. Ramanamurthy e G. Vijaya Kumar. "Challenges in Launching Unusual Structure at Off Shore". In River and Coastal Engineering, 311–17. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05057-2_27.

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3

Chandra Chakraborty, Bikash. "FRP for Marine Application". In Fiber-Reinforced Plastic [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.101332.

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Fiber Reinforced Plastics (FRPs) are widely used in marine sector owing to their high specific strength and resistance to marine corrosion. For naval application, additional advantages are transparency to radar wave and better vibration damping than metals. The use of various FRPs in off-shore structures and marine vessels needs analysis of desired properties considering the types of matrices and fiber. The common consideration is effect of sea water on the properties of the FRP. This chapter gives a brief on use of different FRPs in various areas such as off-shore pillars, Reinforced Cement Concrete (RCC) enclosers, primary and secondary marine components. A brief discussion is included here on diffusion models and estimation of durability by a time-temperature superposition principle applied to water ingress and corresponding change in mechanical strength of FRPs with examples. The effect of microbial activity on the damage of FRP is not very much reported in literature. It is known that sulfate-reducing bacteria (SRB) are the most damaging microbes for FRP. In conclusion, it is highlighted that vinyl-ester-based FRPs using glass and carbon fibers are best for marine application. To determine the realistic service life in marine environment, Vinyl Ester- FRP (VE-FRP) are to be simultaneously studied for damage due to sea water and the microbes such SRB.
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Edwards, H. Keith, e Varadharajan Sridhar. "Collaborative Software Requirements Engineering Exercises in a Distributed Virtual Team Environment". In Advanced Topics in Global Information Management, Volume 5, 178–98. IGI Global, 2006. http://dx.doi.org/10.4018/978-1-59140-923-6.ch008.

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Round-the-clock work cycle, low cost of software development, and access to specialized skills have prompted many companies in the USA, Canada, and Europe to outsource some or part of their software development work to off-shore centers in countries such as India. While design, development, and testing phases that are traditionally off-shored require less interaction between clients and the off-shore consultants, phases such as requirements engineering require close co-ordination and interaction. The clients and consultants in such off-shored projects often work in a virtual team environment. In this research, our endeavor is to understand the complex issues in such a virtual project environment during the requirements definition phase of the software development cycle. In particular, we conducted an exploratory research study, involving 24 virtual teams based in Canada and India, working collaboratively on defining business requirements for software projects, over a period of 5 weeks. The study indicates that trust between the teams and well-defined task structure positively influence the performance, satisfaction, and learning level of such distributed virtual teams.
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Goodarzi, M., B. Ossig e J. Thal. "A case study of the structural health monitoring for off-shore monopile foundations: sensors and analyses". In Schwingungen von Windenergieanlagen 2017, 29–36. VDI Verlag, 2017. http://dx.doi.org/10.51202/9783181023013-29.

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Osorio, Diana Benito. "The Benefits of Home-Based Working's Flexibility". In Encyclopedia of Human Resources Information Systems, 102–9. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-883-3.ch015.

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The history of home working in Western economies can only be understood by means of changes in the systems of production in Europe and North America and through changes in the general sphere of women’s responsibilities, which typically include family work as well as paid work (Johnson, 2003). Both new situations produce the most important change: the change in work venue. The development in industrial production has been an uneven and changing pattern, beginning with artisanal guilds of the middle ages and continuing through to industrial production in the 19th and 20th centuries (Boris, 1996). Mistakenly, the process of industrialization has often been characterized as a unidirectional shift of production from home to factory (Johnson, 2003), but the reality has been very different. The earliest forms of industrialization first appeared within the home setting (Albrecht, 1982). One of the initial impetuses for the use of home-based working arrangements among such employees was provided by the oil crisis of the 1970s which, in conjunction with advances in computer technology, led to a surge of interest in “telecommuting” among white collar workers (Niles, Carlson, Gray, & Hanneman, 1976). However, it was not until the development of personal computers and networked systems in the 1980s that home-based working arrangements experienced significant growth, growth that has been particularly pronounced among executives, managers, scientists, and engineers in large corporations (Bureau of National Affairs, 1991). This home-based working’s revival, on the early 1980s, was linked to the shift in the structure of employment and production in post-industrial economies of North America and Western Europe (Lipsig-Mummé, 1983). Years later, in the 1990s, this subject was treated again but with a new vision. While adoption of telework was slow during the 1980´s, the subsequent decade’s information revolution resulted in considerable growth in new work forms (Moss, Whitfield, Johnson, & Andrey, 2006; Robertson, 2005) The “renaissance” was interpreted as a symptom of economic restructuring that put increased pressure on domestic industries from off-shore producers (Leach, 1998).
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Atti di convegni sul tema "Off-shore structures"

1

Ladru, F., E. Lugscheider, H. Jungklaus, C. Herbst e I. Kvernes. "Tailored Solutions for Off-Shore Applications by Plazjet Sprayed Coatings". In ITSC 1997, a cura di C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0175.

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Abstract For very large structures and parts in critical environments, a materials solution often cannot be found by using one material. The specific desired properties for those structures, like stiffness, ductility, high temperature stability, corrosion resistance, etc. are difficult to fulfill with only one material. In this case a solution may be found by using coatings and design their specific properties to replenish each other by their combination. The Thermal Spraying processes offer the necessary flexibility of producing thin to thick, ductile, soft to hard coatings while due to the wide range of process temperatures it is possible to process a wide range of materials, both as coating and structure. In this paper the some recent and important developments in Thermal Spraying to produce coatings for technical demanding structures will be described. These developments consist of High Power Plasma Spraying, powder- and process control development. To ensure process consistency during long spraying times and to apply reproducible coating quality a suitable process control is of great importance and the development of temperature control by Pyrometry and Thermography will be presented. The example will be drawn according to the application of a coating on a ball valve for off-shore and ship diesel engine parts (piston and valve).
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Owens, Brian, John E. Hurtado, Joshua A. Paquette, Daniel T. Griffith e Matthew F. Barone. "Aeroelastic Modeling of Large Off-shore Vertical-axis Wind Turbines: Development of the Offshore Wind Energy Simulation Toolkit". In 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-1552.

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3

Salvadori, G., G. R. Tomasicchio, F. D’Alessandro, E. Musci, W. El-Shorbagy e A. El-Hakeem. "Multivariate Coastal and Off-Shore Design and Risk Assessment via Copulas at the Arabian Gulf". In Coastal Structures and Solutions to Coastal Disasters Joint Conference 2015. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480304.029.

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Hollt, Thomas, Ahmed Magdy, Guoning Chen, Ganesh Gopalakrishnan, Ibrahim Hoteit, Charles D. Hansen e Markus Hadwiger. "Visual analysis of uncertainties in ocean forecasts for planning and operation of off-shore structures". In 2013 IEEE Pacific Visualization Symposium (PacificVis). IEEE, 2013. http://dx.doi.org/10.1109/pacificvis.2013.6596144.

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Olunloyo, Vincent O. S., e Charles A. Osheku. "On the Effects of a Non-Stationary Seabed on the Morison Hydrodynamic Force for Off-Shore Structures". In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67475.

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It is well known that hydrodynamic forces can have significant effect on the dynamic stability and performance of moving offshore structures that are deployed for the exploration and exploitation of seabed geo-resources. This paper presents an integral transform approach for investigating the effects of non-stationary behavior of the seabed on the Morison hydrodynamic force associated with vertically moving submerged and partially buried offshore structures located in the neighborhood of an exploration zone. For this, the fluid-structure-soil dynamic interaction boundary value problem is modeled as a one-degree-of-freedom system, and the geo-mechanical behavior of the seabed is idealized as a spring and visco-elastic damper. In particular, the corresponding fluid velocity potential and acceleration kernels in the Morison force empirical relation as modified by the seabed poro-mechanics are computed and their implications for the design of such offshore structures analyzed.
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Nanjo, Takanori, Toshikazu Miyashita, Shunji Kataoka e Takuya Sato. "Study on Intermediate Support of Tall Columns for FPSO Topside Structures". In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63177.

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FPSO (Floating Production, Storage and Offloading) has become used increasingly for off-shore gas fields. Most tall pressure vessels such as columns installed in the FPSO are surrounded by topside structures. In general, columns in on-shore plants are supported only by bottom skirts; on the other hand, some of the tall columns on FPSO hulls require intermediate supports in addition to bottom skirts because of large accelerations they are subject to due to ship motion induced by wave loading. In this paper, the effects of the support were investigated considering acceleration distributions and structure deformation (drift), then the ideal elevation of the support was determined to minimize bending moment throughout the columns under the combined conditions. A dimensionless controlling parameter related to the acceleration, structure drift, and column properties was proposed and graphs (called N-Charts) were proposed to understand effects in reducing the maximum bending moment with respect to the elevation of the guide.
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Thibaux, P., J. Van Wittenberghe, E. Van Pottelberg, M. Van Poucke, P. De Baets e W. De Waele. "Efficient Fatigue Testing of Tubular Joints". In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41740.

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Tubular joints are intensively used in off-shore structures for shallow waters. Depending on the sea conditions and the type of structure, the design can be fatigue driven. This is particularly the case for off-shore wind turbines, where turbulences are generating a fatigue loading. Any improvement of the fatigue performance of the tubular joint would be beneficial to reduce the weight and the cost of the structure. To assess efficiently the fatigue resistance of the tubular joint, a testing method has been developed based on the resonance principle. The complete circumference of the welded joint can be loaded, successively in the in-plane and out-of-plane modes at a frequency close to 20Hz. Finite element computations were used to investigate the feasibility of the concept. Then, an X-node was made and successfully tested to investigate the stress distribution along the weld. The experimental results were compared with finite element computations, giving a good agreement.
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Popkov, Vyacheslav, Alexander Sterenberg, Vladimir Gusev e Andrey Tyutyaev. "COGNITIVE GEOLOGY OF SUPERIMPOSED SCATTERING OF MOBILE ORE ELEMENTS, PROPER FORMS OF MULTISCALE STRUCTURAL STRESS STABILITY, BIOGENETIC ACCESS CODE OF RESOURCES AND FIELD ARTEFACTS". In GEOLINKS International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/geolinks2020/b1/v2/11.

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The authors present the theory is numerical / analytical method of multi-scaled 4D geomechanics – geo-dynamics of energy integration in geo-physical rhythms of Eigen-solution of Navier-Stokes equations for multi-level geological time space of evolution in structural compacted mass transfer at the basis of Newton’s Differential Law ∫V∫TρdS·∂2ξ/∂t2 following the integration formula of A. Einstein E(u,t)=ρVC2+∫V∫Tρ‹uv›dtdx. Сreate the theory (Restoration) and Maintenance of Water Eco-System with Given Parameters. They establish the geophysical seismic rhythms of geological cycles in deep structural formations of the Volga-Urals and Siberia and Kamchatka at dissipative emission, adsorption and nuclear magnetic resonance. The authors propose the systematic velocity model of convective diffusion drift of ρ<uv> in deep phase components of heterogenic structures with complexly structured geology in off-shore and global aeration of Middle Ridges from the Urals to the Rocky Mountains. They have also considered the energy time space of more than 4,5 billion years to find the organic markers of quantum photo-synthesis and multiple circulating energy waves in physical and chemical reactions of compacted formation genesis in fissile and relict shales, including the facies with symmetrical absolutely-saturated porosity of classical fields. They establish the geophysical seismic rhythms of geological cycles in deep structural formations of the Volga-Urals and Siberia and Kamchatka at dissipative emission, adsorption and nuclear magnetic resonance. The authors propose the systematic velocity model of convective diffusion drift of ρ‹uv› in deep phase components of heterogenic structures with complexly structured geology in off-shore and global aeration of Middle Ridges from the Urals to the Rocky Mountains. They have also considered the energy time space of more than 4.5 billion years to find the organic markers of quantum photo-synthesis and multiple circulating energy waves in physical and chemical reactions of compacted formation genesis in fissile and relict shales, including the facies with symmetrical absolutely-saturated porosity of classical fields’ cognitive geology, artefacts.
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Wang, Y. G., L. M. Yang, F. H. Zhou, G. Y. Chen, Z. I. Lu e D. I. Zhuang. "Flexible Protection Technology of Bridge Pier against Ship Collision". 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.2022.1038.

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<p>Bridges across navigation channels are under the threat of accidental ship collisions. Many research works have been conducted to investigate the crashworthy device against ship-bridge pier collisions. However, the existing bridge pier protection facilities, mostly based on absorbing ship kinetic energy, are large structures with high strength, resulting in large collision forces that may cause ship damage. In this paper, flexible anti-collision technology is developed, which protects the bridge pier based on the ship's course guidance principle, hence taking away the huge kinetic energy of the ship in the process of collision. The pier flexible crashworthy device has a compact structure and can greatly reduce the impact force of ships, protecting both the bridge and the ship. The reliability and effectiveness of the technology have been verified through off-shore impact tests.</p>
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Hackel, Lloyd A., C. Brent Dane, Fritz Harris, Jon Rankin e Chanh Truong. "Transportable Laser Peening System for Field Applications to Improve Fatigue and SCC Resistance of Offshore Components and Structures". In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93334.

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Laser peening technology has matured into a fully qualified production process that is now in routine and reliable use for a range of aerospace alloys. The technology is capable of extending the fatigue life and stress corrosion cracking life of components, and will enable designers to consider higher stress levels in life limited designs. Applications under development for steels include high and medium strength steels used in off shore oil exploration and production, titanium, aluminum and even ceramics and plastics as well as life extension of steel and aluminum welds. Fixed systems to treat components and transportable systems capable of field operations are available with a moveable beam that allows peening directly as needed on large structures.
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