A Discussion of Several Problems on In-situ Measurements and Analysis of Subway Train-induced Vibration
By discussing of several problems encountered in -situ measurement on a section perpendicular to a subway line in Shanghai , some meaningful results related to evaluation and analysis of environmental vibration were obtained as follows : (1) To the same measuring point, the vibration level (VL) analyzed by JGJ/T170-2009 was higher than GB100704-1988. According to the statistic analysis,the difference of two standards for the measuring points in building was higher than that in tunnel and on ground ; (2) Sampling frequency should be 2. 5 times as high as the maximum analysis frequency and approximately equal to the number of 2m. It can avoid distortion induced by data cut off as well as artificial reduction of VL ; (3) In process of one-third octave band spectrum (1/3 OCT)analysis,when the sampling time period takes one second ,the VL may be zero in some lower 1/3 OCT center frequencies. Longer sampling time is suggested in analysis of 1/3 OCT analysis; (4) The method using overlapping time has little effect on VL. So it is not necessary to use the method of overlapping time.
Yuan YUAN Tong JIANG Feng LIU
Chongqing Architectural Design Institute ,Chongqing 400015,China Research Institute of Structural Engineering and Disaster Reduction ,Tongji University,Shanghai 2000 Shanghai Xiandai Architectural Design Group , Shanghai 200041, China
国际会议
5th International Symposium on Environmental Vibration(第五届环境振动国际研讨会)
成都
英文
320-327
2011-10-20（万方平台首次上网日期，不代表论文的发表时间）