PURPOSES : The noise, which is typically generated by fast moving vehicles, can be intercepted by installing a noise barrier with a soundproof panel. However, reflections from the panels cause secondary noise, and hence lower the effectiveness of the panels. In this study, the reduction of reflection noise by considering the shape, especially zigzag one, of the soundproof panel have been evaluated. METHODS : The simulation model used in this study was Nord2000, which simulates real-road situations effectively. Based on the simulation results, the joining angle of 133。with the pattern width (a) equal to 2 m and the projection height (b) equal to 0.5 m was adapted in the zigzag shape as the best profit designing factors. RESULTS: The measuring results at middle height, 15 m showed reduction at all points except the point with average -1.6 dB. At a greater height of 30 m, 2 points showed reduction. A real-sized facility was constructed to investigate the reflected sound from a zigzag shaped panel up to the height of 5 m. CONCLUSIONS: The reduction effects were detected in all the receive points in the range of 2-6 m distances and 1-5 m heights comparing the plane panel. Compared to plane panel, the noises are reduced at an average of 2.4 dBA.

본 연구에서는 실내실험을 통하여 U형 강박스거더의 상부 수평브레이싱이 휨 거동에 미치는 영향을 파악하고 기존의 수평브레이싱 설계 제안식에 대한 적정성을 검토하기 위하여, 실제 시공되고 있는 U형 강박스 거더 단면의 2/3정도 되는 캔틸레버 형식의 시험체를 제작하여 휨 실험을 수행하였다. 이로써 수집된 데이터를 분석하여 상부 수평브레이싱의 합리적인 휨 설계식 제안을 위한 기초를 마련하였다. 그리고, 상부 수평브레이싱의 형태 및 패널수의 변화에 따른 휨 실험을 통하여 브레이싱 부재의 응력을 측정하고 Helwig가 제안한 설계식으로 구한 값과 비교한 결과 합리적인 브레이싱의 형태 및 패널 수를 얻을 수 있었다.