장기 공용 후, 디스크받침이 설치된 판형교의 동적 거동 평가

This study conducts two field tests of a steel railway bridge supported disk bearings to assess the long-term dynamic behavior of the steel railway bridge and a disk bearing in the service for 5.5 years; the length of the bridge is 12 m. Displacement and acceleration in vertical direction, deformation of disk bearings and natural frequency of the first mode are measured and analyzed. In addition, the vertical stiffness of the disk bearing is estimated, and the deformation of the disk bearing due to static loading is calculated using the estimated stiffness and compared to the measured dynamic response. Vertical displacement at mid-span, deformation of a fixed disk bearing, and the first natural frequency do not vary due to the 5.5 year service. However, deformation of an expansion disk bearing increases sharply comparing to other components.