地铁环境中房屋浮置地板隔振分析
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摘要
建立并求解分析弹簧支承浮置地板单自由度系统动力学模型,从而判明弹簧隔振的特点;根据振动波的传播和隔振弹簧布置位置要求,确定浮置地板有限单元划分,进而建立浮置地板多自由度系统动力学有限元分析模型,求解浮置地板动力学有限元模型在地铁振动激励下的加速度响应;介绍浮置地板振动评价指标———振动加速度级,利用国家有关标准规定,对浮置地板隔振效果进行评价,从而为地铁环境中建筑物浮置地板隔振设计提供依据。
An analytical model of the single degree of freedom system of a floating floor was established.The characteristics of the spring vibration isolation were presented based on the calculation of the analytical model.According to the theory of wave propagation and the location of supporting springs,the size of finite elements was determined and the floating floor was subdivided into a number of finite elements.Therefore,the finite element model of the floating floor was built,and the vibration accelerations of the floating floor were calculated.Vibration acceleration level,the evaluation index of vibration,was introduced.Quantitative evaluation of the efficiency of spring isolation was made,based on the Chinese national standard of limit of vibration.
An analytical model of the single degree of freedom system of a floating floor was established.The characteristics of the spring vibration isolation were presented based on the calculation of the analytical model.According to the theory of wave propagation and the location of supporting springs,the size of finite elements was determined and the floating floor was subdivided into a number of finite elements.Therefore,the finite element model of the floating floor was built,and the vibration accelerations of the floating floor were calculated.Vibration acceleration level,the evaluation index of vibration,was introduced.Quantitative evaluation of the efficiency of spring isolation was made,based on the Chinese national standard of limit of vibration.
引文
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[6]闫维明,张袆,任珉,等.地铁运营诱发振动实测及传播规律[J].北京工业大学学报,2006,32(2):149-154.
[2]Balendra T,Chua KH,Lo K W,et al.Steady-State Vi-bration of Subway-Soil-Building System[J].Journalof Engineering Mechanics,1989,115(1):145-162.
[3]中国建筑科学研究院.GB/T50355—2005住宅建筑室内振动限值及其测量方法标准[M].北京:中国建筑工业出版社,2005.
[4]Clough RW,Penzien J.Dynamics of Structures[M].New York:Mc Graw-Hill,Inc.1993.
[5]大崎顺彦.地震动的谱分析入门[M].吕敏申,谢礼立译.北京:地震出版社,1980.
[6]闫维明,张袆,任珉,等.地铁运营诱发振动实测及传播规律[J].北京工业大学学报,2006,32(2):149-154.
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