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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Re-assessment of Existing Offshore Platform for Life Extension
Majority of offshore steel platforms in Mumbai High Field in Arabian Sea as well as around the world are about to reach their design life. To continue to operate the platforms after their design life, existing offshore platforms requires re-certification. Also change in design criteria, addition of new facility and damages of the structure may lead to a need for assessment. Underwater and topside surveys are carried out to collect sufficient information about the present condition of the structures for their engineering assessment. The method normally used for assessment of existing offshore structures is In-place analysis based on Design level and Ultimate level check. In-place analysis of the jacket structure has been carried out using SAC’s software to evaluate the structural adequacy of the jacket structure in accordance with code API-RP2A criteria’s for life extension. In-place analysis is based on working stress and considers only linear analysis for the jacket structure. If Jacket structure does not pass design level criteria, advance analysis such as ultimate strength analysis needs to be carried out as per criteria of API-RP-2A to study failure mechanism of the structure and determine Reserve Strength Ratio (RSR). In ultimate strength analysis both material and geometrical nonlinearity is considered and incremental loading is applied to study the behaviour of the structure. This paper intends to provide Re-assessment of existing fixed offshore steel platform and results from the investigation are discussed and conclusions are drawn about the applicability of the proposed framework.
Re-assessment of Existing Offshore Platform for Life Extension
Majority of offshore steel platforms in Mumbai High Field in Arabian Sea as well as around the world are about to reach their design life. To continue to operate the platforms after their design life, existing offshore platforms requires re-certification. Also change in design criteria, addition of new facility and damages of the structure may lead to a need for assessment. Underwater and topside surveys are carried out to collect sufficient information about the present condition of the structures for their engineering assessment. The method normally used for assessment of existing offshore structures is In-place analysis based on Design level and Ultimate level check. In-place analysis of the jacket structure has been carried out using SAC’s software to evaluate the structural adequacy of the jacket structure in accordance with code API-RP2A criteria’s for life extension. In-place analysis is based on working stress and considers only linear analysis for the jacket structure. If Jacket structure does not pass design level criteria, advance analysis such as ultimate strength analysis needs to be carried out as per criteria of API-RP-2A to study failure mechanism of the structure and determine Reserve Strength Ratio (RSR). In ultimate strength analysis both material and geometrical nonlinearity is considered and incremental loading is applied to study the behaviour of the structure. This paper intends to provide Re-assessment of existing fixed offshore steel platform and results from the investigation are discussed and conclusions are drawn about the applicability of the proposed framework.
Re-assessment of Existing Offshore Platform for Life Extension
Lecture Notes in Civil Engineering
Nehdi, Moncef (Herausgeber:in) / Hung, Mo Kim (Herausgeber:in) / Venkataramana, Katta (Herausgeber:in) / Antony, Jiji (Herausgeber:in) / Kavitha, P. E. (Herausgeber:in) / Beena B R (Herausgeber:in) / Singh, Shikha (Autor:in) / Singh, Rajan (Autor:in)
International Conference on Structural Engineering and Construction Management ; 2023 ; Angamaly, India
03.11.2023
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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