환경소음 저감을 위한 판형교 성능개선 연구

In the railway bridges, steel plate girder types are preferred due the high stability. Nevertheless, it has been pointed out that this type of bridge has problems such as, structural damages in the rail and girder seat, noise problem due to impact at the rail joint and excessive vibration. This vibration and/or deflection are mainly because insufficient stiffness of steel plate type of bridge. This problems can not be avoided because the long rail system is applied in the modern railway structures. From 2010 the railway bridge noise also would be regulated by the law and the counter plan shall be prepared. In the current practice, the plate girder bridge strengthen can be performed either by plate strengthen, girder replacement or applying ballast, but all of these alternates have limitation for application and cost. To resolve these problems, PC composite plate girder type is proposed in this study. By this method, long rail technique can be applied with axial force reduced bearings. Using this method, economic rail maintainers, girder stiffness increase, and also speed/ride improvement even for existing rail could be expected by dynamic performance improvement. Additionally noise due to impact, deflection and vibration caused from long rails can be reduced. Also this method could be applied to the tilting train's speed improvement in the plate girder bridge which is introduced to improve existing rail's speed improvements.