深水桥墩流固耦合下的自振特性研究
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摘要
首先探讨了深水桥墩流固耦合下动力特性研究的有限元理论和建立计算模型的方法。研究了桥墩墩水耦合分析中流体单元网格尺寸、流体范围对深水桥墩动力特性数值解精度的影响,得出了工程中常见的墩水耦合分析较优水体单元尺寸和理想水体范围图。计算分析了矩形、圆形和圆端型截面深水桥墩的自振特性,实心墩在水中的自振频率降低10%～20%之间。空心墩频率降低幅度大于实心墩,与截面尺寸和壁厚密切相关。水体对空心墩的振型也有一定影响。进一步研究了淹没深度、桥墩截面尺寸以及空心墩壁厚对深水桥墩频率降低幅度的影响,得到有益的结论。该研究方法以及相关结论可以对墩水耦合问题的进一步研究以及工程应用提供参考。
The finite element theory of fluid structure interaction has been studied and a new method to modeling pier-water coupling has been introduced firstly.Then the fluid element mesh size and fluid scope,which are influencing factors of calculation precision,have been discussed,so as to achieve better fluid element mesh size and appropriate fluid scope for commonly used piers in engineering.Natural vibration properties of rectangular piers,circular piers and round-ended piers have been calculated,which shows that vibration frequency of solid deep-water piers descend 10%~20%than that in air,and hollow deep-water piers descend more than solid ones the vibration frequency of hollow deep-water pier is mainly affected by section dimension and wall thickness,and vibration mode is to be affected also.Further,the influence parameters of frequency decreased degree such as water depth,pier section dimension and wall thickness of hollow pier have been researched,and useful results have been achieved.
The finite element theory of fluid structure interaction has been studied and a new method to modeling pier-water coupling has been introduced firstly.Then the fluid element mesh size and fluid scope,which are influencing factors of calculation precision,have been discussed,so as to achieve better fluid element mesh size and appropriate fluid scope for commonly used piers in engineering.Natural vibration properties of rectangular piers,circular piers and round-ended piers have been calculated,which shows that vibration frequency of solid deep-water piers descend 10%~20%than that in air,and hollow deep-water piers descend more than solid ones the vibration frequency of hollow deep-water pier is mainly affected by section dimension and wall thickness,and vibration mode is to be affected also.Further,the influence parameters of frequency decreased degree such as water depth,pier section dimension and wall thickness of hollow pier have been researched,and useful results have been achieved.
引文
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[6]Craggs A.A Finite Element Model for Acoustically Lined SmallRooms[J].Journal of Sound and Vibration.1986,108(2):327-337.
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[10]高学奎,等.近场地震作用下深水桥墩的地震响应分析[J].工程抗震与加固改造,2006,28(3):84-85.
[11]白德贵,王志华,陈国兴.深水桥梁桩基础考虑流固耦合效应的地震反应分析方法综述[J].防灾减灾工程学报,2007,27(Suppl):88-94.
[12]Zhou Q,Joseph P F.A numerical method for the calculation of dy-namic response and acoustic radiation from an underwater structure[J].Journal of Sound and Vibration,2005,283(4):853-873.
[13]Christian Cabos,Frank Ihlenburg.Vibrational analysis of ships withcoupled finite and boundary elements[J].Journal of ComputationalAcoustics,2003,11(1):91-114.
[2]黄显彬,等.都汶高速公路庙子坪岷江特大桥震后5号主墩加固技术[J].建筑技术,2010,41(2):136-138.
[3]屈爱平,高淑英.梁—墩—桩基础的动力特性研究[J].西南交通大学学报,2001,36(6):641-644.
[4]孙利民,李凤琴,张鹏.弹体水中自振特性的有限元分析[J].淮阴工学院学报,2008,17(3):3-4.
[5]Cho J R.Finite Element Techniques for the Free-Vibration andSeismic Analysis of Liquid-Storage Tanks[J].Finite Elements inAnalysis and Design,2001,37(4):467-483.
[6]Craggs A.A Finite Element Model for Acoustically Lined SmallRooms[J].Journal of Sound and Vibration.1986,108(2):327-337.
[7]Bathe K J.Finite Element Procedures[M].Prentice-Hall.Engle-wood Cliffs,1996.
[8]Zienkiewicz O C,Newton R E.Coupled Vibrations of a StructureSubmerged in a Compressible Fluid.Proceedings of the Symposiumon Finite Element Techniques.University of Stuttgart.Germany.June 1969.
[9]赖伟,等.桥墩地震动水效应的水下振动台试验研究[J].地震工程与工程振动,2006,26(6):166-167.
[10]高学奎,等.近场地震作用下深水桥墩的地震响应分析[J].工程抗震与加固改造,2006,28(3):84-85.
[11]白德贵,王志华,陈国兴.深水桥梁桩基础考虑流固耦合效应的地震反应分析方法综述[J].防灾减灾工程学报,2007,27(Suppl):88-94.
[12]Zhou Q,Joseph P F.A numerical method for the calculation of dy-namic response and acoustic radiation from an underwater structure[J].Journal of Sound and Vibration,2005,283(4):853-873.
[13]Christian Cabos,Frank Ihlenburg.Vibrational analysis of ships withcoupled finite and boundary elements[J].Journal of ComputationalAcoustics,2003,11(1):91-114.
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