Dynamic stress analysis of the leg joints of self-elevating platform |
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Authors: | Zhao-yu Huang Wen-yong Tang Yi Wang Wen-tao Wang |
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Institution: | b a State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200030,China b Shanghai Zhenhua Heavy Industry Co.Ltd,Shanghai 200125,China |
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Abstract: | Since a self-elevating platform often works in water for a long time, the lattice leg is largely influenced by wave and current.
The amplitude of leg joint stresses is a very important factor for the fatigue life of the platform. However, there are not
many researches having been done on the mechanism and dynamic stress analysis of these leg joints. This paper focuses on the
dynamic stress analysis and suppression methods of the leg joints of self-elevating platforms. Firstly, the dynamic stresses
of the lattice leg joints are analyzed for a self-elevating platform by use of the 5th-order Stokes wave theory. Secondly,
the axial and bending stresses are studied due to their large contributions to total stresses. And then, different joint types
are considered and the leg-hull interface stiffness is analyzed for the improvement of the joint dynamic stress amplitude.
Finally, some useful conclusions are drawn for the optimization design of the self-elevating platform. |
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Keywords: | self-elevating platform leg joint dynamic stress stress amplitude improvement |
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