双向地震波输入时振动方向对拱坝地震响应的影响
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摘要
拱坝-地基三维地震响应分析中大多只分析入射地震波在拱坝-地基系统坐标系方向输入时的地震响应,而事实上,垂直入射的剪切波其振动方向是不确定的,地震波动的合理输入对拱坝-地基系统的地震响应分析起着决定性的作用。本文研究了拱坝-地基系统在双向地震波输入时不同振动方向对拱坝-地基系统地震响应的影响。计算结果表明:在双向地震波输入情形时,拱坝位移及应力响应最大值均不是发生在传统方法的横河向或者顺河向,而是与输入地震波相关,所以在研究拱坝-地基三维地震响应时有必要考虑入射地震波振动方向的影响。
The effects of incident earthquake wave vibration direction on three-dimensional arch dam seismic analysis are mostly confined to the cases: along the river,across the river or three-directional earthquake input.However,in fact,the main vibration direction of vertical incident shear waves is uncertain.Reasonable input of earthquake wave plays a decisive role in the seismic responses of arch dam and foundation system.The effects of different earthquake wave vibration directions on seismic response of arch dam-foundation system are studied in this paper.The results show that: in the case of bidirectional earthquake wave input,the maximum displacement and strain responses of arch dam don’t occur when the vibration direction is across or along the river.The maximum responses are relative to the input seismic wave.So it is necessary to consider the vibration direction of the incident earthquake wave in the study of 3D seismic responses of arch dam.
The effects of incident earthquake wave vibration direction on three-dimensional arch dam seismic analysis are mostly confined to the cases: along the river,across the river or three-directional earthquake input.However,in fact,the main vibration direction of vertical incident shear waves is uncertain.Reasonable input of earthquake wave plays a decisive role in the seismic responses of arch dam and foundation system.The effects of different earthquake wave vibration directions on seismic response of arch dam-foundation system are studied in this paper.The results show that: in the case of bidirectional earthquake wave input,the maximum displacement and strain responses of arch dam don’t occur when the vibration direction is across or along the river.The maximum responses are relative to the input seismic wave.So it is necessary to consider the vibration direction of the incident earthquake wave in the study of 3D seismic responses of arch dam.
引文
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[9]涂劲.混凝土大坝抗震数值分析理论与工程应用[M].北京:中国水利水电出版社,2007:84.TU jin.Aseismic analysis of concrete dam with numerical method:theory&engineering practice[M].Beijing:China Water Power Press,2007:84.(in Chinese)
[10]廖振鹏.近场波动的数值模拟[J].力学进展,1997,27(2):193-302.LIAO Zhenpeng.Numerical simulation of near-field wave motion[J].Advances in Mechanics,1997,27(2):193-302.(in Chinese)
[2]Du Xiuli,Zhang Yanhong,Zhang Boyan.Nonlinear seismic response analysis of arch dam-foundation systems-part I dam-foundation rock interaction[J].Bull Earthquake Eng,2007(5):105-119.
[3]肖诗云,林皋,李宏男.拱坝非线性地震反应分析[J].地震工程与工程振动,2002,22(4):36-40.XIAO Shiyun,LIN Gao,LI Hongnan.Nonlinear seismic response of a high arch dam[J].Journal of Earthquake Engineering and Engineering Vibra-tion,2002,22(4):36-40.(in Chinese)
[4]刘新佳,徐艳杰,金峰,等.地震非均匀自由场输入下的拱坝非线性反应分析[J].清华大学学报:自然科学版,2003,43(11):1567-1571.LIU Xinjia,XU Yanjie,JIN Feng,et al.Nonlinear responses of high arch dams to nonuniform free field motion due to seismic input[J].Journal ofTsinghua University.Science and Technology,2003,43(11):1567-1571.(in Chinese)
[5]何建涛,陈厚群,马怀发.拱坝非线性地震反应分析[J].地震工程与工程振动,2012,32(2):68-73.HE Jiantao,CHEN Houqun,MA Huaifa.The nonlinear sesmic response analysis of arch dam[J].Journal of Earthoquake Engineering and Engi-neering Vibration,2012,32(2):68-73.(in Chinese)
[6]Tatsuo Ohmachi,Abdolrahim Jalali.Fundamental study on near-field effects on earthquake response of arch dams[J].Earthquake Engineering andEngineering Seismology,1999,1(1):1-11.
[7]姬淑艳,李英民,刘立平,等.考虑双向水平地震作用的结构设计问题研究[J].地震工程与工程振动,2006,26(5):68-72.JI Shuyan,LI Yingmin,LIU Liping,et al.Study on bidirectional seismic action in structural seismic design[J].Journal of Earthouake Engineeringand Engineering Vibration,2006,26(5):68-72.(in Chinese)
[8]杜修力,赵密.基于黏弹性边界的拱坝地震反应分析方法[J].水利学报,2006(9):1063-1069.DU Xiuli,ZHAO Mi.Analysis method for seismic response of arch dams in time domain based on viscous-spring artificial boundary condition[J].Journal of Hydraulic Engineering,2006(9):1063-1069.(in Chinese)
[9]涂劲.混凝土大坝抗震数值分析理论与工程应用[M].北京:中国水利水电出版社,2007:84.TU jin.Aseismic analysis of concrete dam with numerical method:theory&engineering practice[M].Beijing:China Water Power Press,2007:84.(in Chinese)
[10]廖振鹏.近场波动的数值模拟[J].力学进展,1997,27(2):193-302.LIAO Zhenpeng.Numerical simulation of near-field wave motion[J].Advances in Mechanics,1997,27(2):193-302.(in Chinese)
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