Abstract
This paper describes characteristics of infra sound radiated from elevated road structure by measurement. Sound pressure levels along road are 70-90dB. In frequency characteristics, two peaks appear. One peak is at 2-6Hz, and the other is at 9-16Hz. Peak frequency at 2-6Hz is proportional to the reciprocal number of the length of road structure. On the other hand, peak frequency at 9-16Hz is not related the road structure length. Sound radiation coefficient by vibration plate is obtained by theoretical equation. At 2-6Hz, the sound radiation loss of concrete plate with road surface is smaller than the one of steel plate with I-type gilder.
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