INCE/J Vibration Measurement Manual for Buildings—Part 4: Measurement of ground propagation characteristic and long-term measurement in building for road traffic vibration

Abstract

Vibration Measurement Manual for Buildings, issued by Technical Subcommittees on Environmental Vibration Evaluation of The Institute of Noise Control Engineering of Japan, describes how to measure and evaluate vibration. According to the manual, vibration level and 1/3 octave band vibration acceleration levels, which are calculated from tri-axial acceleration waveforms, are used as measurement values. For the values of each axis, we extracted the 10 maximum values of each band level around the time when vibration levels reached maximum by vibration occurrences. The final measurement result is arithmetic average of the maximum 10 data. Some measuring instruments including vibration level meters, data recorders and waveform analysis software are necessary to obtain the result. To show how to measure vibration and how to operate measuring instruments based on the manual, we report two measurement examples about road traffic vibration which is easily perceptible. First, we measured a ground propagation characteristic at multi points along straight line from vibration source. Second, we conducted a long-term vibration measurement in a building, assuming low occurrence of vibration which caused complaints. As a result, we found that the level of certain frequency bands in vertical direction reached the vibration perception threshold range.