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국내 강판형 철도교는 1930년대에 가설되기 시작하여 다른 교량형식에 비해 상당한 공용기간을 가지고 있으며 많은 교량들이 노후화되고 있다. 또한 구조형식에 있어서도 리벳형 판형교에서 용접형 판형교 형식으로 변경되고 있으며 도상의 경우는 무도상에서 유도상으로 교체되고 있다. 도상형식이 무도상의 경우는 침목 등 궤도구조가 거더의 상부 플렌지에 직접적으로 놓여지기 때문에 열차하중이 거더에 직접적으로 전달되며 그에 따른 충격, 진동 및 소음 등이 크게 발생한다.


It analyzed the mechanical behaviors of non-ballasted railway bridge (steel plate girder type) with ballast reinforced on the finite element analysis, field test and laboratory test for the static and dynamic responses. The major objective of this study is to investigate the effects and application of reinforcement for steel plate girder railway bridge by the external post-tensioning method. The reinforcement of non-ballast railway bridge had obviously stable dynamic behaviors due to the additional dead force which was ballast. But in case of static behaviors, static displacements and stresses had increased nearly the allowable values. Therefore we analyzed the mechanical behaviors of non-ballasted railway bridge with ballast reinforced and external post-tensioning reinforced on the finite element analysis and laboratory test for the static and dynamic behavior. As a result, the reinforcement of ballasted railway bridge the external post-tensioning method are obviously effective for the additional dead force which is ballast. The analytical and experimental study are carried out to investigate the post-tension force decrease bending behavior and deflection in composite bridge for serviceability. The servicing railway bridge with ballast reinforced has need of the reasonable reinforcement measures which could be reducing the effect of additional dead load that degradation phenomenon of structure by an unusual stresses and a drop durability.