水中悬浮隧道锚索横向动力特性分析
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摘要
考虑流体-结构偶联效应和悬浮隧道锚索的几何非线性特点,建立了悬浮隧道锚索非线性振动方程,并通过ANSYS有限元软件的二次编程,在时域内实现了方程求解,分析了悬浮隧道锚索在非线性横向升力作用下的动力特性。计算结果表明:锚索的轴力和锚索中部的最大位移都随锚索的预张力增加而显著下降;在非涡激振动的情况下,随均匀流速度的增加,锚索中部的最大位移有所增加,但是在涡激共振的情况下,锚索中部位移有跳跃性增加;随着锚索长度的增加,锚索中部的最大位移变小,轴力随之增加;锚索的倾斜角度对锚索的轴力和位移的影响基本一致,随角度的增加,轴力和位移均先减小,后增加。
Considering the nonlinear characteristics of submerged floating tunnel(SFT) cable and the lateral dynamic response of structure-fluid interaction(SFI),a nonlinear dynamic model equation of SFT cable was established in the time domain,the equation was solved by the secondary development of finite element software ANSYS,and the nonlinear dynamic characteristics of the SFT cable was analyzed under the action of lateral lift.The results show that the axial force of the cable and the maximum displacement of the middle part of the cable have a significant reduction with the increasing of cable pretension.The maximum displacement of the middle part of cable has a certain increase with the increasing uniform flow velocity without resonance,and it has a jumping develop with resonance.The maximum displacement of middle part of cable decreases with the increasing of cable length,but the axial force of the cable increases.The inclination of the cable has the similar effect on the displacement and the axial force,the axial force and the displacement increase at beginning and then decrease with the increasing of inclination.
Considering the nonlinear characteristics of submerged floating tunnel(SFT) cable and the lateral dynamic response of structure-fluid interaction(SFI),a nonlinear dynamic model equation of SFT cable was established in the time domain,the equation was solved by the secondary development of finite element software ANSYS,and the nonlinear dynamic characteristics of the SFT cable was analyzed under the action of lateral lift.The results show that the axial force of the cable and the maximum displacement of the middle part of the cable have a significant reduction with the increasing of cable pretension.The maximum displacement of the middle part of cable has a certain increase with the increasing uniform flow velocity without resonance,and it has a jumping develop with resonance.The maximum displacement of middle part of cable decreases with the increasing of cable length,but the axial force of the cable increases.The inclination of the cable has the similar effect on the displacement and the axial force,the axial force and the displacement increase at beginning and then decrease with the increasing of inclination.
引文
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[16]陈健云,孙胜男,王变革.水下悬浮隧道锚索的动力分析[J].计算力学学报,2008,25(4):488-492.CHEN Jian-yun,SUN Sheng-nan,WANG Bian-ge.Dynamic analysis for the tether of submerged float-ing tunnel[J].Chinese Journal of Computation Me-chanics,2008,25(4):488-492.
[2]项贻强,薛静平.水中悬浮隧道在国内外的研究[J].中外公路,2002,22(6):49-52.XIANG Yi-qiang,XUE Jing-ping.Research on sub-merged floating tunnel[J].Journal of China andForeign Highway,2002,22(6):49-52.
[3]Toshiyuki F.Submerged floating tunnels project inFunka bay design conference and execution[C]//The International Tunnel Association.Proceedingsof International Floating Tunnels.Sandnes:The In-terneational Tunnel Association,1996:15-34.
[4]葛斐,董满生,惠磊,等.水中悬浮隧道锚索在波流场中的涡激动力响应[J].工程力学,2006,23(增I):217-221.GE Fei,DONG Man-sheng,HUI Lei,et al.Vortex-induced vibration of submerged floating tunnel teth-ers under wave and current effects[J].EngineeringMechancis,2006,23(S1):217-221.
[5]陈健云,王变革,孙胜男.悬浮隧道锚索的涡激动力响应分析[J].工程力学,2007,24(10):186-192.CHEN Jian-yun,WANG Bian-ge,SUN Sheng-nan.Analysis of vortex-induced dynamic response for theanchor cable of submerged floating tunnel[J].Engi-neering Mechanics,2007,24(10):186-192.
[6]麦继婷.波流作用下悬浮隧道的响应研究[D].成都:西南交通大学,2005.
[7]Remseth S,Leira B J.Dynamic response and fluid/structure interaction of submerged floating tunnels[J].Computers&Structures,1999,72(4):659-685.
[8]Kuo M H,Homg J H,Yeh R C.A co-rotational pro-cedure that handles large rotation of spatial beamstructures[J].Computer&Structures,1987,27(6):769-781.
[9]Kunish H,Mizuno S,Mizuno Y,et al.Study on sub-merged floating tunnel characteristics under thewave condition[C]//ISOPE.Proceedings of the In-ternational Offshore and Polar Engineering Confer-ence.Osaka:ISOPE,1994:27-32.
[10]张学志,黄维平.考虑流固耦合时的海洋平台结构非线性动力分析[J].中国海洋大学学报,2005,35(5):823-826.ZHANG Xue-zhi,HUANG Wei-ping.Nonlinear dy-namic analysis of offshore platform considering fluidstructure interaction[J].Periodical of Ocean Univer-sity of China,2005,35(5):823-826.
[11]Roger K.A review of vortex shedding research andits application[J].Ocean Engineering,1977,4(3):141-171.
[12]祖楠,黄维平.考虑流固耦合时的海底管道悬跨段非线性动力分析[J].中国海洋大学学报,2006,36(1):168-172.ZU Nan,HUANG Wei-ping.Nonlinear dynamic a-nalysis of submarine pipelines considering fluidstructure interaction[J].Periodical of Ocean Univer-sity of China,2006,36(1):168-172.
[13]Chopra A K.结构动力学理论及其在地震工程中的应用[M].谢礼立,吕大刚,译.北京:清华大学出版社,2009.
[14]华旭刚,陈政清.在ANSYS中实现颤振时程分析的方法[J].中国公路学报,2002,15(4):32-34.HUA Xu-gang,CHEN Zheng-qing.Approach oftime history analysis of flutter in ANSYS[J].ChinaJournal of Highway and Transport,2002,15(4):32-34.
[15]王广地.波流作用下悬浮隧道结构响应的数值分析及试验研究[D].成都:西南交通大学,2008.
[16]陈健云,孙胜男,王变革.水下悬浮隧道锚索的动力分析[J].计算力学学报,2008,25(4):488-492.CHEN Jian-yun,SUN Sheng-nan,WANG Bian-ge.Dynamic analysis for the tether of submerged float-ing tunnel[J].Chinese Journal of Computation Me-chanics,2008,25(4):488-492.
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