레일매립궤도 시스템이 적용된 판형교의 진동 및 소음특성에 대한 연구

Abstract

Most of the existing rail structures have undergone a lot of aging since a considerable period of time has passed from completion. In particular,among existing railway bridges, many of the plate girder bridges are older bridges that have lived 40 to 60 years or more. Since the treadmill is directlyconnected to the girder without the ballast, the running load of the vehicle is directly transmitted to the bridge. Therefore, the shock and noise appliedto the bridge are larger than those of the ballast bridge, and the dynamic shock and vibration are also relatively large. Therefore, it is very urgent todevelop appropriate maintenance, repair and reinforcement technology for existing steel plate bridge. In this study, the authors introduced thecharacteristics of embedded rail (ERS) developed for improving the performance of the existing plate girder bridge and the techniques solving thevibration and noise problems. In order to evaluate the vibration and noise reduction performance of ERS, a non-ballast plate girder bridge with 5mlength of sleepers installed and a plate girder bridge with ERS were fabricated. And, then, the vibration response generated under the same excitationcondition was measured and analyzed. Also, the radiated noise analysis was performed using the vibration response data obtained from the experimentas the input data of the acoustic analysis model. As a result of experiments and analyses, it was confirmed that the plate girder bridge’s vibration usingERS was reduced by 15.0~18.8dB and the average noise was reduced by 7.7dB(A) more than the non-ballast bridge.