渡槽地震动水压力及表达式数值研究
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摘要
基于流固耦合动力分析理论,采用数值模拟方法,对输入波形式、上部结构槽数及下部排架高度等若干渡槽设计因素进行数值计算分析,研究地震激励下渡槽动水压力特性。结果表明:单、多槽侧壁动水压力分布规律基本相同,多槽中壁动水压力数值约为侧壁的2倍。传统渡槽抗震计算采用Westergaard动水压力修正解析解,但其仅考虑单槽槽身结构,而数值计算结果表明排架高度对渡槽动水压力影响较大;基于常用排架渡槽有限元模型数值计算,拟合出包含下部排架高度参数的动水压力公式,可供渡槽抗震设计参考。
Based on the fluid-structure interaction theory,a systematic study of the characteristics of hydrodynamic pressure acting on aqueducts under earthquake loads was conducted using the numerical simulation method and considering design factors such as the input waveforms,the number of grooves in the upper structure,and the height of the lower framework.The results show that the hydrodynamic pressure on the sidewalls of a single groove and sidewalls of multiple grooves is basically the same.The hydrodynamic pressure on the middle wall of the multiple grooves is about twice that on the sidewall.The traditional seismic calculation of aqueducts uses the Westergaard hydrodynamic pressure to modify the analytical solution,but it only takes the single-groove body structure into account,and the numerical results show that the height of the framework has significant influence on the hydrodynamic pressure on the aqueduct.Based on the numerical calculation of the commonly used finite element model for framework-supported aqueducts,a hydrodynamic pressure formula considering the height of the lower framework was obtained,which can provide a reference for seismic design of aqueducts.
Based on the fluid-structure interaction theory,a systematic study of the characteristics of hydrodynamic pressure acting on aqueducts under earthquake loads was conducted using the numerical simulation method and considering design factors such as the input waveforms,the number of grooves in the upper structure,and the height of the lower framework.The results show that the hydrodynamic pressure on the sidewalls of a single groove and sidewalls of multiple grooves is basically the same.The hydrodynamic pressure on the middle wall of the multiple grooves is about twice that on the sidewall.The traditional seismic calculation of aqueducts uses the Westergaard hydrodynamic pressure to modify the analytical solution,but it only takes the single-groove body structure into account,and the numerical results show that the height of the framework has significant influence on the hydrodynamic pressure on the aqueduct.Based on the numerical calculation of the commonly used finite element model for framework-supported aqueducts,a hydrodynamic pressure formula considering the height of the lower framework was obtained,which can provide a reference for seismic design of aqueducts.
引文
[1]何建涛.大型渡槽流体与固体的动力耦合分析[D].西安:西安理工大学,2007.
[2]刘广.大型渡槽流-固耦合动力性能和地震响应研究[D].南京:河海大学,2011.
[3]李遇春,楼梦麟.强震下流体对渡槽槽身的作用[J].水利学报,2000,31(3):46-52.(LI Yuchun,LOU Menglin.Action offliud on aqueduct body during strong earthquake[J].Journal of Hydraulic Engineering,2000,31(3):46-52.(in Chinese))
[4]季日臣,夏修身,陈尧隆,等.考虑流-固耦合梁式矩形渡槽横向地震响应研究[J].地震学报,2007,29(3):328-334.(JIRichen,XIA Xiushen,CHEN Yaolong,et al.Transverse seismic response of beam aqueduct considering fluid-structure coupling[J].Journal of Earthquake,2007,29(3):328-334.(in Chinese))
[5]SL203—1997水工建筑物抗震设计规范[S].
[6]CHOPRA A K.Earthquake analysis of concrete gravity dams including dam-water-foundation rock interaction[J].EarthquakeEngineering and Structural Dynamics,1981,9:363-383.
[7]杜修力,王进廷.动水压力及其对坝体地震反应影响的研究进展[J].水利学报,2001,32(7):13-21.(DU Xiuli,WANGJinting.Review of studies on the hydrodynamic pressure and its effects on the seismic response of dams[J].Journal of HydraulicEngineering,2001,32(7):13-21.(in Chinese))
[8]TOUHEI T,OHMACHI T.A FE-BE method for dynamic analysis of dam-foundation-reservoir system in the time domain[J].Earthquake Engng Struct Dyn,1993,22(3):195-209.
[9]张艳红.大型渡槽抗震概论[M].北京:地震出版社,2004.
[10]朱伯芳,高季章,陈祖煜,等.拱坝设计与研究[M].北京:中国水利水电出版社,2002.
[11]WESTERGAARD.Water Pressures on dams during earthquakes[J].Trans ASCE,1933,98:418-433.
[12]王军.动水压力特性及对渡槽抗震性能影响研究[D].南京:河海大学,2012.
[2]刘广.大型渡槽流-固耦合动力性能和地震响应研究[D].南京:河海大学,2011.
[3]李遇春,楼梦麟.强震下流体对渡槽槽身的作用[J].水利学报,2000,31(3):46-52.(LI Yuchun,LOU Menglin.Action offliud on aqueduct body during strong earthquake[J].Journal of Hydraulic Engineering,2000,31(3):46-52.(in Chinese))
[4]季日臣,夏修身,陈尧隆,等.考虑流-固耦合梁式矩形渡槽横向地震响应研究[J].地震学报,2007,29(3):328-334.(JIRichen,XIA Xiushen,CHEN Yaolong,et al.Transverse seismic response of beam aqueduct considering fluid-structure coupling[J].Journal of Earthquake,2007,29(3):328-334.(in Chinese))
[5]SL203—1997水工建筑物抗震设计规范[S].
[6]CHOPRA A K.Earthquake analysis of concrete gravity dams including dam-water-foundation rock interaction[J].EarthquakeEngineering and Structural Dynamics,1981,9:363-383.
[7]杜修力,王进廷.动水压力及其对坝体地震反应影响的研究进展[J].水利学报,2001,32(7):13-21.(DU Xiuli,WANGJinting.Review of studies on the hydrodynamic pressure and its effects on the seismic response of dams[J].Journal of HydraulicEngineering,2001,32(7):13-21.(in Chinese))
[8]TOUHEI T,OHMACHI T.A FE-BE method for dynamic analysis of dam-foundation-reservoir system in the time domain[J].Earthquake Engng Struct Dyn,1993,22(3):195-209.
[9]张艳红.大型渡槽抗震概论[M].北京:地震出版社,2004.
[10]朱伯芳,高季章,陈祖煜,等.拱坝设计与研究[M].北京:中国水利水电出版社,2002.
[11]WESTERGAARD.Water Pressures on dams during earthquakes[J].Trans ASCE,1933,98:418-433.
[12]王军.动水压力特性及对渡槽抗震性能影响研究[D].南京:河海大学,2012.
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