In the case of railway bridges passing through the urban area, bridge type with excellent noise reduction performance is required. The bridges under development are steel composite through bridges, which is a composite structure of upper flanges with concrete, and the section bridges themselves, which surround the train, have the feature of acting as a sound barrier. In this paper, the performance test of air conduction noise is performed by the 20m full scale model test of new type steel composite through bridge.

Abstract
 1. 서 론
 2. 실험개요 및 측정방법
 3. 측정결과
 4. 결 론
 참고문헌

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