During a construction of a road, a temporary bridge is often connected to a existing bridge. In this case, a fatigue stability problem, which is not considered in the design of the bridge, can be occurred in the main girder of the existing bridge due to the vehicle load direction change. In this study, the fatigue stability of the main girder and cantilever slab of the bridge was tested with the allowable fatigue stress of the design specifications of the road bridge. The big stress change was occurred at 55m away from the support, and the middle point of the span. Furthermore, the excess of the allowable fatigue stress of the design specifications of the road bridge was confirmed at the cross section. Hence, it was concluded that the reinforcements for the cantilever slab and main girder of the bridge are required. The bridge after the reinforcement was tested for the fatigue stability, and it was confirmed that the bridge is safe.

ABSTRACT
 1. 서 론
 2. 검토 방향
  2.1 기존 교량 개요
  2.2 해석 모델링 하중 산정
  2.3 설계 피로 응력 검토 단면과 위치에 따른 구조상세
  2.4 주형의 설계 피로 응력 산정
 3. 해석 결과
  3.1 설계 피로 응력 검토
  3.2 보강 후 해석 결과
  3.3 보강 후 설계 피로 응력 검토
 4. 결 론
 References

• 이규세(선문대학교 토목공학과) | Yi Gyu Sei