Assessment of Fixed Offshore Platform Performance in Hurricane Ivan

Puskar, Frank; Ku, Albert; Gilbert, Robert B.; Choi, Young Jae

doi:10.4043/18325-ms

Cited by 10 publications

(2 citation statements)

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“…Zheng and Liaw [103] also worked on the nonlinearity issues of wave forces and structural responses by a frequency-domain cumulant spectral analysis method. Ersdal [104],Puskar, et al [105] first discussed a major problem on wave loading evaluation applying the Ultimate Force for Framed Offshore Structures (USFOS). This approach increased its efficiency in calculating the structural failure using USFOS nonlinear analysis.…”

Section: Frequency Domain Methodsmentioning

confidence: 99%

Offshore Structural Reliability Assessment by Probabilistic Procedures—A Review

Ahmad

Husain²,

Zaki³

et al. 2021

JMSE

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Offshore installations must be built to resist fatigue as well as extreme forces caused by severe environmental conditions. The structural reliability analysis is the popular practise to assess a variety of natural waves determined by the long-term probability distribution of wave heights and corresponding periods on the site. In truth, however, these structures are subjected to arbitrary wave-induced forces in the open ocean. Hence, it is much more reasonable to account for the changed loading characteristics by determining the probabilistic characteristics of the random loads and outcomes responses. The key challenges are uncertainties and the non-linearity of Morison’s drag element, which results in non-Gaussian loading and response distributions. This study would analyze advances achieved to date in a comprehensive probabilistic review of offshore fixed jacket-type platforms.

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Section: Frequency Domain Methodsmentioning

confidence: 99%

Offshore Structural Reliability Assessment by Probabilistic Procedures—A Review

Ahmad

Husain²,

Zaki³

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…Another method that was successfully performed was by jacking-up the platform in order to increase the air gap of platform [61]. This is crucial so that the effect of wave-in-deck can be minimized to avoid major damage or failure to offshore platforms as reported by Botelho et al [62], Puskar et al [63] and Forristall [64].…”

Section: Probability Of Failurementioning

confidence: 99%

Structural Integrity of Fixed Offshore Platforms by Incorporating Wave-in-Deck

Azman¹,

Husain²,

Zaki³

et al. 2021

JMSE

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The structural integrity of offshore platforms is affected by degradation issues such as subsidence. Subsidence involves large settlement areas, and it is one of the phenomena that may be experienced by offshore platforms throughout their lives. Compaction of the reservoir is caused by pressure reduction, which results in vertical movement of soils from the reservoir to the mud line. The impact of subsidence on platforms will lead to a gradually reduced wave crest to deck air gap (insufficient air gap) and cause wave-in-deck. The wave-in-deck load can cause significant damage to deck structures, and it may cause the collapse of the entire platform. This study aims to investigate the impact of wave-in-deck load on structure response for fixed offshore structure. The conventional run of pushover analysis only considers the 100-year design crest height for the ultimate collapse. The wave height at collapse is calculated using a limit state equation for the probabilistic model that may give a different result. It is crucial to ensure that the reserve strength ratio (RSR) is not overly estimated, hence giving a false impression of the value. This study is performed to quantify the wave-in-deck load effects based on the revised RSR. As part of the analysis, the Ultimate Strength for Offshore Structures (USFOS) software and wave-in-deck calculation recommended by the International Organization for Standardization (ISO) as practised in the industry is adopted to complete the study. As expected, the new revised RSR with the inclusion of wave-in-deck load is lower and, hence, increases the probability of failure (POF) of the platform. The accuracy and effectiveness of this method will assist the industry, especially operators, for decision making and, more specifically, in outlining the action items as part of their business risk management.

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Reassessment of Fixed Offshore Structures

Stewart

2017

Encyclopedia of Maritime and Offshore Engineering

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Existing offshore platforms are valuable assets for operators, and optimizing their useful life to maximize profitability is an ongoing challenge. Reassessment is required from time to time to ensure that the structures remain safe and reliable. This can be instigated for a variety of reasons such as increased topside or environmental loading or damage. Wave‐in‐deck loads resulting from rare events pose a particular concern. Nonlinear pushover models enable the full benefit of structural capacity to be realized, while structural reliability assessments allow risk‐based decisions to be made. This article reviews the present methodologies for nonlinear structural modeling, pushover assessments (including static, cyclic, and dynamic procedures), environmental statistics including wave‐in‐deck loading, and structural reliability assessments and provides a comment on some of the limitations and potential pitfalls of these.

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Assessment of Fixed Offshore Platform Performance in Hurricane Ivan

Cited by 10 publications

References 0 publications

Offshore Structural Reliability Assessment by Probabilistic Procedures—A Review

Offshore Structural Reliability Assessment by Probabilistic Procedures—A Review

Structural Integrity of Fixed Offshore Platforms by Incorporating Wave-in-Deck

Reassessment of Fixed Offshore Structures

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