For the purpose of finding out the acoustical characteristics of exterior materials in bridge, analytical studies are performed with boundary elements method by using the commercial program SYSNOISE. Before analysis, to figure out material property, it was conducted experiments of absorption coefficient for absorptive material. And prediction of pressure were conducted I GIRDER type (before & after installation of absorption panel ) and BOX GIRDER type (before & after installation of absorption panel) The results show that when the absorption panel is installed, environment around bridge can help reduce traffic noise. It was proved to be the effective noise reduction counter-plan for a traffic noise in the bridges.

Abstract
 1. 서 론
 2. 교량형 외장재의 필요성
 3. 흡음 외장재 특성
 4. 교량 형태와 흡음재 부착 위치에 따른시뮬레이션 결과
 6. 결 론
 7. References
 저 자 소 개

• 이유엽(호원대학교 자동차기계공학과) | You Yub Lee Corresponding author