【摘要】 对上海地铁一号线的环境振动影响进行地面实测分析并与标准限值进行比较,分析了实测值中不同振动频率成分的衰减规律。首先利用基底输入加速度时程的一致激励法进行三维建筑的振动分析,讨论建筑内振动传播的总体规律和频率成分变化规律,得出多层建筑中振动逐层放大的结论。然后采用三维基准建筑模型,分别由大质量法和相对位移法两种方法,比较多点激励环境振动分析的两种不同基底输入方法,验证大质量法的多点激励计算方法的正确性和采用加速度时程输入时的适用性。进一步采用大质量法进行平面规模较大建筑的多点激励环境振动分析,得出多点激励法的Z振级计算值比一致激励法小很多从而一致激励法偏于安全的结论。更多还原

【Abstract】 According to the vibration test data from a site near the subway line No. 1 in Shanghai,the environmental vibration level is compared with the code limit and the attenuation of the vibration at various frequencies is analyzed. The vibration attenuation in a 3-D building model is analyzed by using a single support excitation method,with the acceleration input from the basement. The general patterns of vibration dispersion in buildings and the frequency change are discussed. It is concluded that vibration increases with the floor level in a multi-story building. Using a 3-D benchmark building model,two different methods,the large mass method (LMM) and the relative move method (RMM),for multiple support excitation of base input are compared. The validity and applicability of the large mass method for multiple support excitations are verified. The environmental vibration distribution in a large scale plane building is analyzed by using the large mass method for multiple support excitations,and it is found that the vibration level in the building by using the multiple support excitation method is much smaller than that by using the single support excitation method.更多还原