Dynamic Stress Analysis of the Leg Joints of Self-Elevating Platform

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 mechani...

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Bibliographic Details
Published inChina ocean engineering Vol. 25; no. 2; pp. 319 - 326
Main Author 黄曌宇 唐文勇 汪怡 王文涛
Format Journal Article
LanguageEnglish
Published Heidelberg Chinese Ocean Engineering Society 01.06.2011
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University,Shanghai 200030, China
Shanghai Zhenhua Heavy Industry Co. Ltd, Shanghai 200125, China%State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University,Shanghai 200030, China%Shanghai Zhenhua Heavy Industry Co. Ltd, Shanghai 200125, China
Subjects
Amplitudes
China
Coastal Sciences
Dynamic tests
Dynamics
Engineering
Fluid- and Aerodynamics
Lattices
Marine
Marine & Freshwater Sciences
Numerical and Computational Physics
Oceanography
Offshore Engineering
Platforms
Simulation
Stokes波
Stress analysis
Stresses
关节
动态应力
升降平台
应力分析
弯曲应力
疲劳寿命
自升式平台
dynamic stress
stress amplitude improvement
self-elevating platform
leg joint
Online AccessGet full text
ISSN0890-5487
2191-8945
DOI10.1007/s13344-011-0026-5

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Summary: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.
Bibliography:32-1441/P
HUANG Zhao-yu , TANG Wen-yong, WANG Yi, WANG Wen-tao （a State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China b Shanghai Zhenhua Heavy Industry Co. Ltd, Shanghai 200125, China）
self-elevating platform; leg joint; dynamic stress; stress amplitude improvement
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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ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-011-0026-5