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


The major objective of this study is to investigate the effects and application of external post-tensioning method for steel plate girder bridge. It analyzed the mechanical behaviors of steel plate girder bridge with applying external post-tensioning on the finite element analysis, field test and laboratory test for the lateral dynamic characteristics. As a result, the reinforcement of steel plate girder bridge the external post-tensioning method are obviously effective for the lateral dynamic response which is non-reinforced. The analytical and experimental study are carried out to investigate the post-tension force decrease lateral acceleration and deflection on steel plate girder bridge for serviceability. And the external post-tensioning method reduce dynamic maximum displacement(about 10~24%), the increase of dynamic safety is predicted by adopting external post-tensioning method. From the dynamic test results of the servicing steel plate girder bridge, it is investigated that the change degree of natural frequency is very low with applying the external post-tensioning method The servicing steel plate girder bridge with external post-tensioning has need of the reasonable reinforcement measures which could be reducing the effect of lateral dynamic behavior that degradation phenomenon of structure by an unusual response characteristic and a drop durability.