performance-based assessment of steel jacket platforms by wave

performance-based assessment of steel jacket platforms by wave

2021-6-28 · based on a simplified method to sort, and possibly exempt, some details from the full rigor of the spectral-based assessment technique. Good judgment, guided by experience and analytical results, may also be applied to comparable details to decide if the results for one detail can be applied to others. 3 FPSO Areas for Fatigue Assessment

2001-3-12 · 1.2 Definition of a Jacket 1.2.1 General Fixed steel offshore structures are often called “jackets”. The name jacket originates from the early days of the offshore industry when a trussed structure, jacket, was placed over the piles to provide lateral stiffness to withstand wave…

2014-12-1 · EWA is a new time history-based approach for estimating the performance of platforms by stepwisely increasing wave profile named Intensifying Wave Train Function (IWTF). Basic concepts of EWA method can be described by a hypothetical experiment as shown in Fig. 1. In this experiment, three different platforms with unknown dynamic characteristics are exposed to an IWTF.

2019-2-17 · structural integrity of four jacket structures at Ekofisk field in the North Sea which had experienced significant subsidence that led to wave-in-deck condition. The reassessment process too is similar to that in Figure 1,but with more emphasis on the ultimate strength analysis as the platforms did not pass the design level assessment.

Corpus ID: 112516568. RISK BASED ASSESSMENT FOR OFFSHORE JACKET PLATFORM IN NIGER DELTA, NIGERIA (CORROSION AND FATIGUE HAZARDS) @inproceedings{Salau2011RISKBA, title={RISK BASED ASSESSMENT FOR OFFSHORE JACKET PLATFORM IN NIGER DELTA, NIGERIA (CORROSION AND FATIGUE HAZARDS)}, author={M. Salau and D. Esezobor and M. Omotoso}, …

Endurance Wave Analysis (EWA) is a novel, simple, economical but yet reliable method for the integrity assessment of offshore platforms against extreme irregular waves.

Jacket platform is essential for continuous crude oil production in Nigerian offshore oil and gas fields. However, the structures are constantly exposed not only to hostile environment and operational conditions but as well as seawater that consists of salty and …

2010-7-13 · In-place Phase (Piles, Jacket ,Deck Integral) Three types of analysis are performed: • Survival state----- wave/current/wind attack with 50 or 100 years recurrence period. • Operational state--- wave/current/wind attack with 1 or 5 years recurrence period, under full operation. • Fatigue assessment for design life. • Accidental.

2011-10-1 · Abstract. In this paper, a relatively novel approach is established to estimate different limit states and accurate behavior of jacket platforms against environmental wave loading. This novel approach which is called Incremental Wave Analysis (IWA) can be an appropriate substitute to current pushover practice.

2018-9-1 · In the current study, a spectral method is introduced for assessment and rehabilitation of jacket platform structure. To this end, a computer program has been developed, meanwhile, probability spectral density functions of displacement and stress are calculated in each joint of jacket elements.

Hence the design and analysis of an offshore structure must include load out and transportation calculations. The aim of the present work is to conduct load out and transportation analysis of a real time jacket platform installed in 78m water depth in the Mumbai High Basin. The platform was loaded onto a launch barge by lifting.

2017-1-1 · Performance-based multi-objective collaborative optimization of steel frames with fuse-oriented buckling-restrained braces. Structural and Multi-disciplinary Optimization. 2020, 61(1): 365-379. (27) Yantai Zhang, Zheng He(*). Seismic collapse risk assessment of

In 1947, the world’s first self-contained steel jacket offshore platform was built in the gulf of Mexico. It reached in a new era of exploitation of ocean. Following the rapid development of offshore petroleum industry, nearly 10000 offshore platforms are widely used …

2021-7-15 · Seismic performance evaluation of jacket-type o shore platforms using endurance time method considering soil-pile-superstructure interaction H. Hasani, A.A. Golafshani and H.E. Estekanchi Department of Civil and Environmental Engineering, Sharif University of Technology (SUT), Tehran, P.O. Box 11155-1639, Iran.

1996-3-1 · Recorded and synthetic storm wave time histories have been used to develop loading time histories acting on template-type platforms having natural periods in the range of 1–5 s. The interactions of these loading histories with the dynamic, nonlinear, hysteretic performance characteristics of idealized systems were analyzed. A modification to ...

2019-9-11 · The motivation and objective of the present study are to propose a hybrid control system for offshore jacket platforms to mitigate the vibrations induced by multiple hazards, namely, the earthquakes and regular and irregular waves.

2015-10-29 · In this article, wave endurance time (WET) is addressed as an applicable method for performance-based assessment of fixed offshore structures under extreme waves. In this method, inspired by the endurance time method in the field of earthquake engineering, artificial wave records called wave functions are designed so that their excitations gradually increase with time.

2013-4-1 · Incremental wave analysis and its application to performance-based assessment of jacket platforms J Constr Steel Res , 67 ( 2011 ) ( 2011 ) , pp. 1649 - 1657 Article Download PDF View Record in Scopus Google Scholar

2009-7-27 · Mirzadeh Niasar, J, Aghakouchak, AA, Samadani, S, & Aghakouchak, A. "Ultimate Strength Analysis of Jacket Type Offshore Platforms Due to Wave, Current and Wind Loading." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 1: Offshore Technology. Estoril, Portugal.

2011-5-1 · The PIWA is a robust methodology which can assess the performance of jacket offshore platforms by probabilistically predicting the structural response under extreme wave loads. In this method, the structural response is quantified via a proper Demand Parameter (DP), i.e. base shear in this study.

2019-7-1 · Steel platforms are extensively used in exploration of offshore oil and gas, the first of which were erected in the Gulf of Mexico in 1947 (Clauss et al., 1992).Of these platforms, fixed offshore jacket-type structures are the most commonly adopted rigs for shallow water depths (Skallerud and Amdahl, 2002).They are exposed to harsh offshore conditions during storms and hurricanes and ...

Spyros Karamanos specializes in structural mechanics and integrity of energy infrastructure systems, with emphasis on steel structures. His research interests focus …

Marine and offshore structures are constructed worldwide for various functions in a variety of water depths and environmental conditions like deep sea oil drilling, marine excavations etc. The offshore structures built onshore in “fabrication yards” have to be loaded out and transported offshore to the final assembly site, onboard a barge.

2020-3-23 · This paper investigates the hybrid-driven-based networked control for an offshore steel jacket platform subject to external wave forces. A hybrid driven strategy is introduced to deal with the problem of networked control for offshore platforms. Then, the networked closed-loop system is modeled as a stochastic delay system. Based on this model, a stability criterion is derived using the ...

Dynamic response of offshore platforms subjected to wave and current is of fundamental importance in analysis. The first step in dynamic analysis is computing dynamic characteristics of the structure. Because of pile-soil-structure and fluid-structure interactive effects in the dynamic behavior, the model is very complex. In this paper a simplified model for dynamic response of jacket-type ...

2020-9-23 · Offshore jacket platforms are subjected to variety of forces during their life period. To resists all kinds of forces, the structural elements should be designed properly to have safety and economy. In order to fulfil this purpose, the structure should be analyzed with great care. As the improvement of oil and gas moves into more profound water, in any case, taller stages with longer periods ...

2018-9-1 · Offshore jacket platforms are exposed to environmental loads such as wind, wave, current, and earthquake throughout the lifetime of operation. Due to dynamic and periodic nature and fatigue phenomenon in the structure, wave forces are the most important loads among others. There are diverse methods to explore the fatigue life of jackets, including deterministic, spectral, and time domain analysis.

2020-11-17 · In the Persian Gulf, wave loads are the dominant load in designing procedure. Vibration control of jacket platforms is always one of the important issues for demanding requirements such as production activity, safety, and serviceability. Tuned Mass Damper (TMD) is one of the well-established control systems in this context.

2020-8-26 · 2.2. Jacket A jacket is a welded tubular space frame with three or more near vertical tubular chord legs with a bracing system between the legs. The jacket provides support for the foundation piles, conductors, risers, and other appurtenances. A jacket foundation includes leg piles which are inserted through the legs (Figure 1) and

This paper presents a simplified approach to analyze the dynamic response of offshore jacket platform based on Timoshenko beam theory. In the study, the jacket platform is simulated as a non-uniform cantilever beam structure subjects to random waves. The assessment of dynamic performance is based on the power spectral densities, variances and spectral moments due to wave spectrum.

Fixed platforms are economically feasible for installation in water depths up to about 1700 ft (520 m). Compliant towers: These platforms consist of slender flexible towers and a pile foundation supporting a conventional deck for drilling and production operations. Compliant towers are designed to sustain significant lateral deflections and forces, and are typically used in water depths ranging from 1500 to …

Derivation of new SAC/FEMA performance evaluation solutions with second‐order hazard approximation. Dimitrios Vamvatsikos. Corresponding Author. Faculty of Civil Engineering, Institute of Steel Structures, National Technical University of Athens, Athens, Greece ...

In this paper, the seismic performance of offshore jacket-type platforms equipped with super- elastic SMA braces was investigated. To do so, the real offshore jacket-type platform, SPD1,

Performance-based assessment of steel jacket platforms by wave endurance time method V Jahanmard, MAD Diznab, H Mehdigholi, MR Tabeshpour, MS Seif Ships and Offshore Structures 12 (1), 32-42 , 2017

2018-1-2 · Assessment of Offshore Platforms Under Extreme Waves by Probabilistic Incremental Wave Analysis,” ... Seismic Performance of Jacket Type Offshore Platforms Through Incremental Dynamic Analysis,” ... A wave prediction framework based on machine learning and the third generation wave …