渡槽拟动力试验仿真分析
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摘要
建立了一种可以同时考虑流-固耦合与桩-土-结构相互作用的渡槽结构水平地震响应的有限元计算模型,该模型通过等效线性化方法考虑土体非线性,以自由场计算结果为依据,确定黏-弹性人工边界的参数及进行相应的地震动输入。建立了渡槽结构拟动力试验模型的整体有限元计算模型,进行了试验地震波作用下的有限元仿真计算,并与拟动力试验结果进行了比较,计算结果与试验结果基本一致,说明了建立的有限元计算模型的有效性。同时,拟动力试验及有限元计算结果表明,水体对渡槽结构地震响应有一定影响,有水工况时,结构的基频降低,可能较无水工况与输入地震波能量主频段偏离更远,从而起到一定的减震作用。
A finite element model was developed for solving horizontal seismic response of aqueduct with fluid-structure coupling and pile-soil-structure interaction in this paper.Equivalent linearization principle was employed to deal with the nonlinear characteristics of the soil.Based on the analysis results of free filed,the parameters of viscous-elastic artificial boundary and the input method of earthquake wave were given.Analysis was carried out by using this finite element model,the results were in good agreement with the pseudo-dynamic testing data.At the same time,the results of the pseudo dynamic test and finite element calculation show that water has a certain effect on the earthquake response of the aqueduct structure.On the water condition,the fundamental frequency of the aqueduct structure decreases and deviates from the energy basic frequency of the input seismic wave farther than that on the water-less condition.In this case,it has certain damping effect.
A finite element model was developed for solving horizontal seismic response of aqueduct with fluid-structure coupling and pile-soil-structure interaction in this paper.Equivalent linearization principle was employed to deal with the nonlinear characteristics of the soil.Based on the analysis results of free filed,the parameters of viscous-elastic artificial boundary and the input method of earthquake wave were given.Analysis was carried out by using this finite element model,the results were in good agreement with the pseudo-dynamic testing data.At the same time,the results of the pseudo dynamic test and finite element calculation show that water has a certain effect on the earthquake response of the aqueduct structure.On the water condition,the fundamental frequency of the aqueduct structure decreases and deviates from the energy basic frequency of the input seismic wave farther than that on the water-less condition.In this case,it has certain damping effect.
引文
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[13]陈波,吕西林,李培振,等.均匀土-桩基-结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(3):91—99.Chen Bo,Lv Xilin,Li Peizhen,et al.Computationalanalysis of dynamic homogeneous soil-pile structure in-teraction[J].Journal of Earthquake Engineering andEngineering Vibration,2002,22(3):91—99.
[14]首培烋,刘曾武,朱镜清.地震波在工程中的应用[M].北京:地震出版社,1982,83—93.
[15]廖振鹏.工程波动导论[M].第二版.北京:科学出版社,2002,57—59.Liao Zhenpeng.Introduction to wave motion theoriesfor engineering[M].Second Edition.Beijing:SciencePress,2002,57—59.
[16]HARDIN B O,DMEVICH V P.Shear modulus anddamping in soils:design equations and curves[J].Journal of the Soil Mechanics and Foundations Divi-sion,1972,(SM7):667—692.
[17]DEEKS A J,RANDOLPH M F.Axisymmetric time-domaintransmiting boundaries[J].Journal of Engi-neering Mechanics,1994,120(1):25—42.
[18]杜修力,赵密,王进廷.近场波动模拟的一种应力人工边界[J].力学学报,2006,38(1):49—56.Du Xiuli,Zhao Mi,Wang Jinting.A stress artificialboundary in FEA for near-field wave problem[J].Chi-nese Journal of Theoretical and Applied Mechanics,2006,38(1):49—56.
[19]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,2006,37(9):1063—1069.Du Xiuli,Zhao Mi.Analysis method for seismic re-sponse of arch dams in time domain based on visousspring artificial boundary condition[J].Journal of Hy-draulic Engineering,2006,37(9):1 063—1 069.
[2]刘云贺,张伯艳,陈厚群.南水北调中线穿黄渡槽工程抗震分析[J].水利水电技术,2004,35(5):49—51.Liu Yunhe,Zhang Boyan,Chen Houqun.Aseismaticanalysis of aqueduct structure for South-to-North wa-ter transfer project[J].Water Resources and Hydro-power Engineering,2004,35(5):49—51.
[3]杨世浩,李正农,郑明燕.南水北调工程洺河渡槽耦合动力分析[J].湖南大学学报(自然科学版),2007,34(12):15—19.Yang Shihao,Li Zhengnong,Zheng Mingyan.Cou-pled aseismatic dynamic analysis of Minghe aqueduct inSouth-to-North water transfer Project[J].Journal ofHunan University(Natural Sciences),2007,34(12):15—19.
[4]李正农,张盼盼,朱旭鹏,等.考虑桩-土动力相互作用的渡槽结构水平地震响应分析[J].土木工程学报,2010,43(12):137—143.Li Zhengnong,Zhang Panpan,Zhu Xupeng,et al.Horizonta seismic response analysis of aqueduct withpier-soil dynamic interaction[J].China Civil Engineer-ing Journal,2010,43(12):137—143.
[5]HOUSER G W.Dynamic pressure on accelerated con-tainers[J].Bull Seism.Soc.Am.,1957,47(3):15—35.
[6]刘云贺,胡宝柱,闫建文,等.Houser模型在渡槽抗震计算中的适用性[J].水利学报,2002,(9):94—99.Liu Yunhe,Hu Baozhu,Yan Jianwen,et al.Applica-bility of Houser model to aseismic characteristics cal-culation of aqueduct[J].Journal of Hydraulic Engi-neering,2002,(9):94—99.
[7]Penzien J,Scheffey C F,Parmekee R A.Seismic anal-ysis of bridges on long piles[J].Journal of the Engi-neering Mechan ics Division,1964,90(EM3):223—254.
[8]孙利民,张晨南,潘龙,等.桥梁桩土相互作用的集中质量模型及参数确定[J].同济大学学报,2002,30(4):409—415.Shun Liming,Zhang Chennan,Pan Long,et al.Lumped-mass model and its parameters for dynamic a-nalysis of bridge pier-pile-soil system[J].Journal ofTongJi University,2002,30(4):409—415.
[9]王海东,尚守平,周志锦,等.瑞利波作用下桩土相互作用横向动力响应计算研究[J].湖南大学学报(自然科学版),2009,36(11):1—5.Wang Haidong,Shang Shouping,Zhou Zhijin,et al.Computational research on the horizontal dynamic re-sponse of single pile considering pile-soil interactionduring passage of Rayleigh waves[J].Journal of Hu-nan University(Natural Sciences),2009,36(11):1—5.
[10]蒋通,(日)田治见宏.地基-结构动力相互作用分析方法:薄层法原理及应用[M].上海:同济大学出版社,2009,164—197.
[11]钱德玲,宋传中,王东坡,等.地基-结构动力相互作用体系中数值仿真的研究[J].岩石力学与工程学报,2008,27(1):1 953—1 959.Qian Deling,Song Chuanzhong,Wang Dongpo,et al.Study on numerical simulation for dynamic interactionof soil and structure[J].Chinese Journal of Rock Me-chanics and Engineering,2008,27(1):1 953—1 959.
[12]卢华喜,梁平英,尚守平.成层地基-桩基-动力相互作用体系的计算分析[J].岩土工程学报,2007,29(5):705—711.Lu Huaxi,Liang Pingying,Shang Shouping.Compu-tational analysis of dynamic layered soil-pile-structureinteraction[J].Chinese Journal of Geotechnical Engi-neering,2007,29(5):705—711.
[13]陈波,吕西林,李培振,等.均匀土-桩基-结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(3):91—99.Chen Bo,Lv Xilin,Li Peizhen,et al.Computationalanalysis of dynamic homogeneous soil-pile structure in-teraction[J].Journal of Earthquake Engineering andEngineering Vibration,2002,22(3):91—99.
[14]首培烋,刘曾武,朱镜清.地震波在工程中的应用[M].北京:地震出版社,1982,83—93.
[15]廖振鹏.工程波动导论[M].第二版.北京:科学出版社,2002,57—59.Liao Zhenpeng.Introduction to wave motion theoriesfor engineering[M].Second Edition.Beijing:SciencePress,2002,57—59.
[16]HARDIN B O,DMEVICH V P.Shear modulus anddamping in soils:design equations and curves[J].Journal of the Soil Mechanics and Foundations Divi-sion,1972,(SM7):667—692.
[17]DEEKS A J,RANDOLPH M F.Axisymmetric time-domaintransmiting boundaries[J].Journal of Engi-neering Mechanics,1994,120(1):25—42.
[18]杜修力,赵密,王进廷.近场波动模拟的一种应力人工边界[J].力学学报,2006,38(1):49—56.Du Xiuli,Zhao Mi,Wang Jinting.A stress artificialboundary in FEA for near-field wave problem[J].Chi-nese Journal of Theoretical and Applied Mechanics,2006,38(1):49—56.
[19]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,2006,37(9):1063—1069.Du Xiuli,Zhao Mi.Analysis method for seismic re-sponse of arch dams in time domain based on visousspring artificial boundary condition[J].Journal of Hy-draulic Engineering,2006,37(9):1 063—1 069.
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