Abstract
Impact noise radiated by elevated rapid-transit systems is a source of community annoyance. Noise reduction for these structures can be accomplished by reducing the amplitude of vibration of the radiating surfaces either by isolation or by viscoelastic damping materials when the structures are made of steel. Evaluations have been made in an acoustics laboratory of the impact noise radiated by scale models of (a) an all-steel bridge, (b) a composite steel box-girder concrete deck bridge, (c) a prestressed all-concrete bridge. The scale-model impact noise level tests will be presented shock excited with an ISO Standard R140 tapping machine. Noise reduction results obtained on the scale-model structures will be compared with noise reduction on full-scale bridge structures, and the effectiveness of the viscoelastic damping material and the correlation between scale-model and full-scale structures by actual test will be described.
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