환경 친화적 콘크리트 슬래브 철도교량의 변형 측정을 위한 연속사진측량 기법 적용

Railroad bridges of South Korea have been replaced by eco-friendly and highly safe concrete-slab structure, which is low noise and vibration, from steel plate-girder structure in the past. Nevertheless, the concrete-slab railroad bridge is constantly exposed to cyclic loading of trains during their life cycle. To ensure the safety of the bridges, it is necessary to inspect deformations periodically. This study proposed sequential-photogrammetric technique to measure deformation of railroad bridge. Consecutive stereo images of the bridge with multiple target marks are obtained by sequential photographing cameras, and then the spatial coordinates of each target as a function of time can be computed by applying the collinearity and space intersection theory. As the result, 3-dimensional dynamic motion of a bridge due to the cyclic loading of train can be measured by applying the proposed method.