On the slack phenomena and snap force in tethers of submerged floating tunnels under wave conditions

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	On the slack phenomena and snap force in tethers of submerged floating tunnels under wave conditions
	Lu W(陆维); Ge F(葛斐); Wang L(王雷); Wu XD(武晓东); Hong YS(洪友士)
刊名	Marine Structures
	2011
通讯作者邮箱	gefei@imech.ac.cn
卷号	24 期号:4 页码:358-376
关键词	Submerged Floating Tunnel Tether Slacking Snap Force Bilinear Oscillator Structure Parameter Slack Criterion Dynamic-Response Excitation Systems
ISSN号	0951-8339
通讯作者	Ge, F (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China
产权排序	[Lu, Wei; Ge, Fei; Wang, Lei; Wu, Xiaodong; Hong, Youshi] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
中文摘要	Under severe sea wave conditions, the mooring tethers of submerged floating tunnel (SFT) might go slack. It may cause the structure failure during the service lifetime of SFT. The paper investigated SFT dynamics when going through tether slacking and the related snap force under wave conditions. Besides the nonlinearity of fluid drag and of structural geometry for a relative large structure displacement, the problem is characterized by the nonlinearity due to the discontinuity in axial stiffness of the tethers. To include these nonlinearities, the method of Lagrange energy is used to build the governing equations of SFT motion, and a bilinear oscillator is introduced to simulate the mooring tether operating in an alternating slack-taut state. The sensitivities of the occurrence of tether slacking to wave height and wave period are investigated. Results show that at a large wave height SFT tether will go slack and snap force occurs. SFT responses are categorized into three types of state according to the dynamic response characteristics of tether tension. Effects of two fundamental structure parameters, buoyancy-weight ratio (BWR) and inclined mooring angle (IMA), on the dynamic responses of SFT are analyzed. A slack-taut map of SFT tethers is built. It intuitively describes the occurrences of slack and snap force with different combinations of the two parameters. An analytical approach for slack prediction by deriving the slack criterion is provided to reveal the mechanism of the presented slack-taut map. By present research, the authors tried to make their effort to provide an alternative philosophy for SFT structural design on concerning preventing the occurrence of tether slacking and snap force. (C) 2011 Elsevier Ltd. All rights reserved.
学科主题	Engineering
分类号	一类
类目[WOS]	Engineering, Marine ; Engineering, Civil
研究领域[WOS]	Engineering
关键词[WOS]	DYNAMIC-RESPONSE ; EXCITATION ; SYSTEMS
收录类别	SCI ; EI
资助信息	This work is supported Knowledge Innovation Program of Chinese Academy of Sciences (no. KJCX2-YW-L07).
原文出处	http://dx.doi.org/10.1016/j.marstruc.2011.05.003
语种	英语
WOS记录号	WOS:000295768800003
公开日期	2012-04-01
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/44906]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Lu W,Ge F,Wang L,et al. On the slack phenomena and snap force in tethers of submerged floating tunnels under wave conditions[J]. Marine Structures,2011,24(4):358-376.
APA	陆维,葛斐,王雷,武晓东,&洪友士.(2011).On the slack phenomena and snap force in tethers of submerged floating tunnels under wave conditions.Marine Structures,24(4),358-376.
MLA	陆维,et al."On the slack phenomena and snap force in tethers of submerged floating tunnels under wave conditions".Marine Structures 24.4(2011):358-376.