超大型海上浮式结构物连接器基座强度分析
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摘要
超大型海上浮式结构物(Very Large Floating Structure, VLFS)是由若干个单模块通过连接器连接而成的海上结构物,连接器是整个结构中最薄弱而又最关键的部分,因此有必要对连接器基座进行静强度分析和极限强度分析。文章采用以包含连接器基座的上箱体为研究对象,选取包含单个连接器基座和两个连接器基座的上箱体局部结构作为模型进行静强度分析,得到了两种模型连接器基座整体Von mises应力不大,但存在基座与连接器连接处、立柱与上箱体底甲板连接处两处明显的高应力区的相关结论。然后,采用非线性有限元准静态法对连接器基座进行极限强度分析,确定结构在危险工况下最先发生破坏的位置,得到基座连接器不同方向的极限承载力。结果表明,连接器基座在各个方向的极限承载力都远大于其载荷预报值,连接器基座具有较大的结构强度储备。文中的研究结果为超大浮体连接器基座的设计和安全可靠性分析提供了相关理论依据。
Very Large Floating Structure(VLFS) is composed of several single modules which are connected through connectors, and the connector is the weakest and the most critical part of the whole structure.So static strength analysis and ultimate strength analysis of the connector base are necessary. In this paper,the upper box including the connector is studied, and the local structure including single connector base and double connector base are selected, and their static strength are analyzed. The results show that although the whole stresses of the two models are little, the joint of the connector and the upper box and the joint of the column and the upper box are obviously the areas of high stresses. Then based on Quasi-Static method of nonlinear finite element method, the ultimate strength of the connector base is calculated. The locations of the first to be damaged under the dangerous working conditions are founded, and the ultimate strength of the connector base under the load of different directions is calculated. The results show that the ultimate bearing capacity of the connector base is far more its predicted loading, and the connector base has a large strength reserve. The results provide a theoretical basis and safety reliability analysis for the design of connector base of the very large floating structure.
Very Large Floating Structure(VLFS) is composed of several single modules which are connected through connectors, and the connector is the weakest and the most critical part of the whole structure.So static strength analysis and ultimate strength analysis of the connector base are necessary. In this paper,the upper box including the connector is studied, and the local structure including single connector base and double connector base are selected, and their static strength are analyzed. The results show that although the whole stresses of the two models are little, the joint of the connector and the upper box and the joint of the column and the upper box are obviously the areas of high stresses. Then based on Quasi-Static method of nonlinear finite element method, the ultimate strength of the connector base is calculated. The locations of the first to be damaged under the dangerous working conditions are founded, and the ultimate strength of the connector base under the load of different directions is calculated. The results show that the ultimate bearing capacity of the connector base is far more its predicted loading, and the connector base has a large strength reserve. The results provide a theoretical basis and safety reliability analysis for the design of connector base of the very large floating structure.
引文
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[12]彭大炜,张世联.结构极限强度分析的三种有限元解法研究[J].中国海洋平台,2010,25(2):1-5.Peng D W,Zhang S L.Study on three FEA methods of structure ultimate strength analysis[J].China Offshore Platform,2010,25(2):1-5
[13]刘超,祁恩荣,夏劲松.超大型浮体连接器动力响应对比研究[C].中国钢结构协会海洋钢结构分会,2015.Liu C,Qi E R,Xia J S.A comparative study on dynamic response of VLFS connectors[C].China Steel Structure Association Marine Steel Structure Branch,2015
[14]郑欣彬,张汇平.87000t散货船结构强度直接计算[J].船舶与海洋工程,2012,2:16-31.Zheng X B,Zhang H P.Direct calculation on 87000t bulk carrier strength[J].Naval Architecture and Ocean Engineering.2012,2:16-31.
[15]曹金凤,石亦平.ABAQUS有限元分析常见问题解答[M].北京:机械工业出版社,2009.Cao J F,Shi Y P.Questions and answers for ABAQUS finite element analysis[M].Beijing:China Machine Press,2009.
[2]王志军,舒志,李润培,等.超大型海洋浮式结构物概念设计的关键技术问题[J].海洋工程,2001,19(1):1-6.Wang Z,Shu Z,Li R P,et al.Technical problems in the conceptual design of very large floating structures[J].Ocean Engineering,2001,19(1):1-6.
[3]Riggs H R,Ertekin R C,Mills T R J.Impact of stiffness on the response of a multimodule mobile offshore base[J].International Journal of Offshore&Polar Engineering,1998,9(2):126-133.
[4]Riggs H R,Ertekin R C,Mills T.Wave-induced response of a 5-module mobile offshore base[C].International Conference on Offshore Mechanics and Arctic Engineering,1998:paper OMAE98-4440.
[5]Riggs H R,Ertekin R C.Characteristics of the wave response of mobile offshore bases[C].International Conference on Offshore Mechanics and Arctic Engineering,1999:paper OMAE99-4068.
[6]Riggs H R,Ertekin R C.Response characteristics of serially connected semisubmersibles[J].Journal of Ship Research,1999,43(4):229-240.
[7]Riggs H R,Ertekin R C.Approximate methods for dynamic response of multi-module floating structures[J].Marine Structures,1993,6(2):117-141.
[8]Derstine M S,Brown R T.A compliant connector concept for the mobile offshore base[J].Marine Structures,2000,13(4):399-419.
[9]管义锋,袁宇波,谷家扬.船舶碰撞载荷对移动海上基地连接器载荷的影响[J].中国造船,2011,52(4):177-185.Guan Y F,Yuan Y B,Gu J Y.Influence of ship collision on connector loads of MOB[J].Shipbuilding of China,2011,52(4):177-185.
[10]余澜,丁伟,李润培.移动式海上基地多模块间相互作用对连接器载荷的影响[J].海洋工程,2004,22(1):25-31.Yu L,Ding W,Li R P.Effect of multiple modules interaction on MOB connector loads[J].Ocean Engineering,2004,22(1):25-31.
[11]金咸定.船舶结构动力学的进展与信息化[J].振动与冲击,2002,21(4):1-6.Jin X D.Advance in ship structure dynamics and application of information technology[J].Journal of Vibration and Shock,2004,22(1):25-31.
[12]彭大炜,张世联.结构极限强度分析的三种有限元解法研究[J].中国海洋平台,2010,25(2):1-5.Peng D W,Zhang S L.Study on three FEA methods of structure ultimate strength analysis[J].China Offshore Platform,2010,25(2):1-5
[13]刘超,祁恩荣,夏劲松.超大型浮体连接器动力响应对比研究[C].中国钢结构协会海洋钢结构分会,2015.Liu C,Qi E R,Xia J S.A comparative study on dynamic response of VLFS connectors[C].China Steel Structure Association Marine Steel Structure Branch,2015
[14]郑欣彬,张汇平.87000t散货船结构强度直接计算[J].船舶与海洋工程,2012,2:16-31.Zheng X B,Zhang H P.Direct calculation on 87000t bulk carrier strength[J].Naval Architecture and Ocean Engineering.2012,2:16-31.
[15]曹金凤,石亦平.ABAQUS有限元分析常见问题解答[M].北京:机械工业出版社,2009.Cao J F,Shi Y P.Questions and answers for ABAQUS finite element analysis[M].Beijing:China Machine Press,2009.