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Fatigue crack in large-scale tubular joints for offshore structures

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Science China(Technological Sciences) 2011年第3期54卷 705-714页

作者： Chul-Hee JO Sung-Woo IM Won-Chul CHO Kwan-Kyu PARK Department of Naval Architecture and Ocean Engineering Inha University Research Institute of Industrial Science and Technology Department of Civil & Environmental Engineering Chung-Ang University Samsung Heavy Industry Inc.

Tubular members have been used for constructing offshore structures. Large-scale fatigue tests of welded tubular K-joints under the balanced in-plane bending brace were carried out to investigate the fatigue behavior of API 2W Gr.50 steel produced by POSCO. The experimental results were verified by numerical approaches and compared with the IIW, DnV RP-C203 and API RP 2A-WSD design curves. The test results based on the hot spot stress were in agreement with the design curves. The SCF factor for tubular K-joint was also obtained. The numerical parametric study of the K-joint (using the finite element program) was described and its results were compared with experimental results. The stress effects of various parameters including α, β, γ, τ and θ on the stress in the K-joint were investigated. The stress distribution for each parameter was introduced. The study showed that the maximum stress of the joint varied according to the variation of joint parameters.

关键词： tubular K-joint API 2W Gr.50 hot spot stress SCF fatigue through-thickness crack S-N curve numerical parametric study

Dynamic Ice-Induced Responses of Offshore Fixed Platforms

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China Ocean Engineering 1996年第1期11卷 55-63页

作者： Duan Menglan Liu Chuntu Wang Weiming Postgraduate, China Classification Society, Beijing 100006 Professor, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 China Classification Society Beijing 100006 Institute of Mechanics Chinese Academy of Sciences Beijing 100080

The dynamic responses of offshore fixed platforms under ice loads are analysed in this paper. The responses calculated include the displacement and the hot spot stresses on the basis of a dynamic equation of ice-induced forced vibration for offshore structures. The results obtained can be cited and used for the design and operation of offshore fixed platforms against ice loading.

关键词： ice-induced vibration displacement hot spot stress off shore fixed platform

Fatigue analysis of the bow structure of FPSO

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Journal of Marine Science and Application 2003年第1期2卷 11-18页

作者： HU Zhi-qiang, GAO Zhen, GU Yong-ning School of Naval Architecture and Ocean Engineering, Shanghai Jiaotong University, Shanghai 200030, China School of Naval Architecture and Ocean Engineering Shanghai Jiaotong University Shanghai 200030 China

The bow structure of FPSO moored by the single mooring system is rather complicated. There are many potential hot spots in connection parts of structures between the mooring support frame and the forecastle. Mooring forces, which are induced by wave excitation and transferred by the YOKE and the mooring support frame, may cause fatigue damage to the bow structure. Different from direct wave-in duced-forces, the mooring force consists of wave frequency force (WF) and 2nd dr aft low frequency force (LF) [3] , which are represented by two sets of short-term distribution respectively. Based on two sets of short-term distribution of moor ing forces obtained by the model test, the fatigue damage of the bow structure of FPSO is analyzed, with emphasis on two points. One is the procedure and position selection for fatigue check, and the other is the application of new formulae for the calculation of accumulative fatigue damage caused by two sets of short-term distribution of hot spot stress range. From the results distingui shed features of fatigue damage to the FPSO’s bow structure can be observed.

关键词： FPSO structural fatigue single mooring system hot spot stress accumulated fatigue damage