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Underwater Strengthening of Tubular Joints of Fixed Offshore Steel Platform Using Grouted Clamps
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 in every five years. Underwater & topside surveys are carried out to collect sufficient information for their engineering assessment. Platform is then analysed as per code API RP 2A criteria’s for life extension. Mitigation for overstressed joints/members based on above analyses is performed and then recertification is provided to continue operation. Mitigation of underwater tubular joint is especially a major concern. Available standards/codes do not provide a detailed guideline for their strengthening measures.
This paper reviews the development of grouted clamp method for strengthening of overstressed joints without removal of existing member. Grouted clamps are bolted underwater with grout infilled in gap with structural member. In this proposed framework, In-place analysis of jacket structure is performed using SACS software to identify overstressed joints with environmental loads in present condition. Finite Element Analysis (FEA) software, ABAQUS, was used to build the computational model of the tubular joint with clamp which provides detailed stress distribution for the joints. The results from the investigation are discussed and conclusions are drawn about the applicability of the proposed framework for the strengthening of tubular joints.
Underwater Strengthening of Tubular Joints of Fixed Offshore Steel Platform Using Grouted Clamps
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 in every five years. Underwater & topside surveys are carried out to collect sufficient information for their engineering assessment. Platform is then analysed as per code API RP 2A criteria’s for life extension. Mitigation for overstressed joints/members based on above analyses is performed and then recertification is provided to continue operation. Mitigation of underwater tubular joint is especially a major concern. Available standards/codes do not provide a detailed guideline for their strengthening measures.
This paper reviews the development of grouted clamp method for strengthening of overstressed joints without removal of existing member. Grouted clamps are bolted underwater with grout infilled in gap with structural member. In this proposed framework, In-place analysis of jacket structure is performed using SACS software to identify overstressed joints with environmental loads in present condition. Finite Element Analysis (FEA) software, ABAQUS, was used to build the computational model of the tubular joint with clamp which provides detailed stress distribution for the joints. The results from the investigation are discussed and conclusions are drawn about the applicability of the proposed framework for the strengthening of tubular joints.
Underwater Strengthening of Tubular Joints of Fixed Offshore Steel Platform Using Grouted Clamps
Lecture Notes in Civil Engineering
Marano, Giuseppe Carlo (Herausgeber:in) / Rahul, A. V. (Herausgeber:in) / Antony, Jiji (Herausgeber:in) / Unni Kartha, G. (Herausgeber:in) / Kavitha, P. E. (Herausgeber:in) / Preethi, M. (Herausgeber:in) / Singh, Shikha (Autor:in) / Dev, Nirender (Autor:in)
International Conference on Structural Engineering and Construction Management ; 2022 ; Angamaly, India
30.10.2022
18 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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