考虑库水可压缩性的拱坝动力响应分析
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摘要
为探讨库水可压缩性在动力响应中的影响,以五嘎冲拱坝为例,采用三维有限元分析方法,进行地震动力时程分析,并将附加质量模型运算结果与其进行对比。计算结果表明,附加质量模型未考虑库水的可压缩性,降低了坝体的自振频率,夸大了动水压力的作用,对横河向和竖直向位移影响较小,增大了坝体顺河向位移;对拱向应力影响较小,但增大了坝体竖直向应力。
To explore the influence of the compressibility of reservoir water on the dynamic response,we carried out time-history analysis on the seismic dynamics of Wugachong arch dam using 3-D finite element model.Compared with the additional mass model,the model in the present study can better reflect the influence of reservoir water on the dynamic response.In the additional mass model,since the compressibility of reservoir water was not considered,the natural frequency of arch dam was lower and the hydrodynamic pressure was exaggerated.Changes of transverse and vertical displacements were little but the longitudinal displacement was increased,and the change of stress in arch direction was little while the vertical stress was increased.
To explore the influence of the compressibility of reservoir water on the dynamic response,we carried out time-history analysis on the seismic dynamics of Wugachong arch dam using 3-D finite element model.Compared with the additional mass model,the model in the present study can better reflect the influence of reservoir water on the dynamic response.In the additional mass model,since the compressibility of reservoir water was not considered,the natural frequency of arch dam was lower and the hydrodynamic pressure was exaggerated.Changes of transverse and vertical displacements were little but the longitudinal displacement was increased,and the change of stress in arch direction was little while the vertical stress was increased.
引文
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[2]KOTSUBO S.External Forces on Arch Dams during Earth-quakes[J].Memoirs Faculty of Engineering,1961,20(4):327-360.
[3]CHOPRA A K.Earthquake Analysis of Concrete Gravity Dams Including Dam-water-foundation Rock Interaction[J].Earthquake Engineering&Structural Dynamics,1981,9(4):363-383.
[4]畑野正.冢原重力ダムの振动实验とその考察[C]∥土木学会论文集.东京:日本土木学会,1958:8-16.(TIAN Ye-zheng.Analysis of Vibration of Zhongyuan Gravity Dam[C]∥Proceedings of Japan Society of Civil Engineers.Tokyo:Japan Society of Civil Engineers,1958:8-16.(in Japanese))
[5]CLOUGH R W,CHANG K T,CHEN He-qun,et al.Dy-namic Interaction Effects in Arch Dams:Earthquake Engi-neering Research Center Report,No.UCB/EERC-85/11[R].Berkeley:University of California,1985.
[6]黄耀英,孙大伟,田斌.两种库水附加质量模型的重力坝动力响应研究[J].人民长江,2009,40(7):64-66.(HUANG Yao-ying,SUN Da-wei,TIAN Bin.Re-search on Dynamic Response of Concrete Gravity Dam in Two Types of Hydrodynamic Added Mass Dam Models[J].Yangtze River,2009,40(7):64-66.(in Chinese))
[7]李瓒,陈兴华,郑建波,等.混凝土拱坝设计[M].北京:中国电力出版社,2000.(LI Zan,CHEN Xing-hua,ZHENG Jian-bo,et al.Concrete Arch Dam Design[M].Beijing:China Electric Power Press,2000.(in Chinese))
[8]王忠,柴贺军,刘浩吾.重力坝动水压力与地震干扰频率的关系[J].成都理工学院学报,2002,29(1):101-104.(WANG Zhong,CHAI He-jun,LIU Hao-wu.The Relationship of Hydrodynamic Pressures on Structures with the Excitation Frequency[J].Journal of Chengdu U-niversity of Technology,2002,29(1):101-104.(in Chi-nese))
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