地铁引起的站台邻近建筑室内振动预测分析

为了对地铁引起的站台邻近建筑楼层振动进行预测,提出并验证半经验半数值的振动预测方法,即运用实测经验法确定振源强度,有限元法分析建筑结构振动传递函数,将源强与传递函数相结合对建筑结构振动响应进行预测。利用半经验半数值的振动预测方法,对某地铁站台及其邻近建筑进行环境振动预测分析,得到地铁运行引起站台邻近建筑室内振动加速度级随楼层变化规律及其频谱特性。结果表明,半经验半数值的振动预测方法可行;地铁引起的站台邻近建筑内,随着楼层升高,低频振动受结构固有频率影响逐步放大,高频振动受阻尼影响能量衰减逐步减小,总振级随楼层增高呈先减小后增大趋势。该结果对地铁运行引起的站台邻近建筑室内环境振动预测及隔振设计具有实际意义。

In-door Vibration Prediction of the Buildings Adjacent to Subway Station Platforms Induced by Subway Operation

To predict the subway induced vibration in platform adjacent building, a semi empirical and semi numerical method was proposed and validated, in which the strength of vibration source was determined through the empirical method and the vibration transfer function of the building was calculated through the finite element method. Then the semi empirical and semi numerical method was applied to analyze the subway induced vibration in a platform adjacent building. The vibration level and its spectrum character of the floors in the building was predicted. The results show that: the semi empirical and semi numerical method is feasible; with the rise of the floor, the low frequency vibration increases progressively influenced by the natural frequency of the structure, the high frequency vibration decreases progressively influenced by the damping, and the total vibration level decreases first and then increases. The conclusions may be helpful for the prediction of the subway platform induced vibration in adjacent building and the engineering design of vibration isolation measures.