关于轨道交通所致建筑振动的计算方法和阻尼矩阵的讨论  

DISCUSSION ON THE METHODS OF ESTIMATING STRUCTURAL VIBRATION FROM RAILWAY LINES AND THE DETERMINATION OF DAMPING MATRIX

作　　者：王田友[1,2] 丁洁民[3] 楼梦麟[2] 

机构地区：[1]上海唯智工程项目管理有限公司,上海200072 [2]同济大学土木工程学院 [3]同济大学建筑设计研究院,上海200092

出　　处：《振动与冲击》2008年第11期77-79,100,共4页Journal of Vibration and Shock

摘　　要：根据振动计算中的一些常见问题,对轨道交通引起的环境振动分析的计算方法与动力方程中阻尼矩阵的取值方法进行了分析。比较了环境振动分析与抗震分析的不同特点,指出环境振动分析由于需要考虑的频率较高,应优先采用直接积分法。通过建筑实例的计算比较,讨论了阻尼取值的方法,提出在形成瑞利阻尼矩阵时,可按所考虑的振动方向取模型的第1阶振型与输入振动的频率范围来确定两个振型,用以计算瑞利阻尼的比例系数。The differences between the dynamic structural features caused by seismic excitation and by environmen- tal vibration were examined,and the methods for estimating the structural vibration induced by railway train operation were focused.It is concluded that in environmental vibration analysis,owing to its higher frequency band compositions,priority is given to the direct integration method.On the basis of numerical examples results of real constructions,the method to determine the damping value was discussed.It is proposed in forming the Rayleigh damping matrix,two vibration modes at the vibrating direction,i.e.,the 1 st mod and the mode closest to the input frequency should be taken into account.

关 键 词：轨道交通 振动 阻尼 直径积分法 振型叠加法 

分 类 号：O327[理学—一般力学与力学基础] TB533[理学—力学]