Strength Analysis on Brace Structure for Semi-Submersible in Consideration of Wave Slamming

作     者：HUO Fa-li YAO Zhi ZHANG Jian WANG Jun-wei DONG Bin 

作者机构：School of Naval Architecture and Ocean EngineeringJiangsu University of Science and TechnologyZhenjiang 212003China Grenland Group(China)Ltd.Shanghai 201206China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2018年第32卷第5期

页      面：536-545页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：financially supported by the Natural Science Foundation of Jiangsu Province(Grant No.BK20170575) University Science Research Project of Jiangsu Province(Grant No.17KJB580005) 

主　　题：semi-submersible platform wave slamming brace structure structural strength 

摘      要：Slamming on bracings of column stabilized units shall be considered as a possible limiting criterion under transit condition based on the requirements in DNV-OS-C103. However, the wave slamming loads under survival condition were ignored for the strength analysis of the brace structures in many semi-submersible projects. In this paper, a method of strength analysis of brace structure is proposed based on the reconstruction and extrapolation of numerical model. The full-scale mooring system, the wind, wave and current loads can be considered simultaneously. Firstly,the model tests of the semi-submersible platform in wind tunnel and wave tanker have been carried out. Secondly,the numerical models of the platform are reconstructed and extrapolated based on the results of model tests. Then, a nonlinear numerical analysis has been conducted to study the wave slamming load on brace in semi-submersible platform through the reconstructed and extrapolated numerical model. For the randomness of wave load, ten subcases under each condition have been carried out. The value of the 90% Gumble distribution values of the ten subcases are used. Finally, the strength on brace structure has been analyzed considering the wave slamming. The wave slamming loads have been compared between the survival condition and transit condition with the method. The results indicate that wave slamming under survival condition is more critical than that under transit ***, the wave slamming is significant to the structural strength of the brace. It should be overall considered in the strength analysis of the brace structure.