Abstract
Noise radiated from steel girders at bridges and aerial structures has been a long standing problem for steel wheel and rail systems. During the initial design period for the San Francisco Bay Area Rapid Transit System, a full scale model girder and deck was constructed in 1964 and tested with and without constrained layer damping on the steel girder plates. The radiated noise from 20 Hz to 150 Hz was reduced by 9 dB with full plate area damping. A test track installation in 1965 also showed about 9 dB reduction in wayside noise with the overall result within about 1 dB of the noise radiated by an all-concrete structure. Because full plate area constrained damping is expensive, a scheme with small area damping pads was developed in the 1970's and applied to composite steel/concrete aerial structures at the Atlanta rail transit system. The result was 9 to 10 dB reduction of low frequency radiated noise, allowing sound barrier walls at the outer edges of the decks to be fully effective in reducing overall wayside noise levels from trains. Drawings of the aerial structures and graphical results from vibration and noise tests are presented.
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