上海自由电子激光工程隔振沟减振数值分析
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摘要
通过运用ANSYS软件,建立了上海自由电子激光(SFEL)工程隔振沟的三维有限元模型,分析了隔振沟在不同位置、深度、宽度以及填充材料时的减振效果。为了避免模型边界处振动波的反射对计算结果的影响,有限元模型上施加了人工边界。计算结果表明:隔振沟深度是影响减振效果的主要因素,随着隔振沟深度的增大其减振效果逐渐增强,建议SFEL工程隔振沟的深度为30 m;隔振沟的位置应尽量靠近SFEL建筑;而隔振沟宽度对其减振效果影响不大;以较硬材料(如混凝土)作为填充材料的隔振沟比以较软材料(如橡胶)有更好的减振效果。
A 3D finite element model in which an artificial boundary condition was suggested to overcome the deviation of calculation result caused by vibration-wave reflection,was established by using ANSYS software.The vibration-attenuation effects of trenches in the SFEL(Shanghai free electron easer laser) engineering project with different trench locations,depths,widths and filled materials were analysed.The results show that the depth is the main factor influencing the vibration-attenuation effect,and the effect will become better with the increase of trench depth.The depth of the SFEL trenches is suggested to be 30 m.The width of trench,has less effect on vibration-attenuation and the trenches should be located as close to the SFEL as possible.In addition,the trenches filled with harder materials such as concrete have better vibration-attenuation effect than with softer materials such as rubber.
A 3D finite element model in which an artificial boundary condition was suggested to overcome the deviation of calculation result caused by vibration-wave reflection,was established by using ANSYS software.The vibration-attenuation effects of trenches in the SFEL(Shanghai free electron easer laser) engineering project with different trench locations,depths,widths and filled materials were analysed.The results show that the depth is the main factor influencing the vibration-attenuation effect,and the effect will become better with the increase of trench depth.The depth of the SFEL trenches is suggested to be 30 m.The width of trench,has less effect on vibration-attenuation and the trenches should be located as close to the SFEL as possible.In addition,the trenches filled with harder materials such as concrete have better vibration-attenuation effect than with softer materials such as rubber.
引文
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[12]王亚秀.隔振沟对加速度衰减的影响[J].内陆地震,1989,3(1):56-59.WANG Ya-xiu.The influence of the trench on the acceleration decay[J].Inland Earthquake,1989,3(1):56-59
[2]Richart F E,Woods R D.Vibration of soils and foundations[M].New Jersey:Prentice-Hall,INC,Englewood Cliffs,1987:130-142.
[3]Shrivastava R K,Kameswara Rao N S V.Response of soil media due to impulse loads and isolation using trenches[J].Soil Dynamics and Earthquake Engineering,2002,22:695-702.
[4]黄应州,高亮.防振沟对铁路引发振动的阻隔作用[J].铁道建筑,2005,10(2):76-77.HUANG Ying-zhou,GAO Liang.The isolation influence of the trench on the vibration caused by train[J].Railway Engineering,2005,10:76-77.
[5]刘奉喜,刘建坤,防建宏.多年冻土区铁路隔振沟隔振效果的数值分析[J].中国铁道科学,2003,24(5):48-51.LIU Feng-xi,LI Jian-kun,FANG Jian-hong.Numercial analysis of the vibration isolation effect of the railway vibration isolating cutting in permafrost[J].China Railway Science,2003,24(5):48-51..
[6]邓亚虹,夏唐代,陈敬虞.车辆动载荷作用下隔振沟响应增强区数值分析[J].岩土工程学报,2006,28(12):2121-2127.DENG Ya-hong,XIA Tang-dai,CHEN Jing-yu.Numerical analysis of response magnified area of vibration isolation trenches subjected to vehicle dynamic loads[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2121-2127..
[7]淳庆,潘建吾.减振沟在强夯施工时的减振效果研究[J].振动与冲击,2010,29(6):115-120.CHUN Qing,PAN Jian-wu.Vibration-isolating effect of vibration-isolating slot in the process of dynamic compaction construction[J].Journal of Vibration and Shock,2010,29(6):115-120.
[8]侯德军,雷晓燕,罗信伟.铁路隔振沟减振的数值分析[J].铁道科学与工程学报,2006,3(2):48-52.HOU De-jun,LEI Xiao-yan,LUO Xin-wei.Simulation analysis of the vibration attenuation by trench in railway[J].Journal of Railway Science and Engineering,2006,3(2):48-52.
[9]冯忠俊,王晓,杜涵文.上海自由电子激光工程地基振动测试研究[J].核技术,2008,31(4):245-249.FENG Zhong-jun,WANG Xiao,DU Han-wen.Ground vibration measurement on Shanghai free electron laser project[J].Nuclear Techniques,2008,31(4):245-249.
[10]金先龙.上海光源微振动响应分析[M].上海:上海应用物理研究所,2004:1-50 JIN Xian-long.Micro-vibration response analysis of SSRF[M].Shanghai:Shanghai Institute of Applied Physics,2004:1-50.
[11]刘晶波,谷音,杜义欣.一致粘弹性人工边界及粘弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075.LIU Jing-bo,GU Yin,DU Yi-xin.Consistent viscous-spring artificial boundaries and viscous-spring boundary elements[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1070-1075.
[12]王亚秀.隔振沟对加速度衰减的影响[J].内陆地震,1989,3(1):56-59.WANG Ya-xiu.The influence of the trench on the acceleration decay[J].Inland Earthquake,1989,3(1):56-59
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