복합파셜거더 고속철도교량 적용을 위한 동적안정성 검토

초록

The purpose of this study is to analyze the dynamic characteristics and the dynamic stability for the application of the complex partial girder for railway bridges. The complex partial girder is a girder in which a box girder is applied to the support part and an I-shaped steel girder is applied to the central part of a span. The complex partial girder has been applied to road bridges, but it has not yet been applied to railway bridges, and basic studies on dynamic characteristics and dynamic stability for application to railway bridges are insufficient. A finite element model of a simply supported complex partial girder railway bridge with a span length of 60 m was established, and a static analysis applying a KTX design train load and a dynamic analysis applying a numerical 3-dimensional train model with multi-degree of freedom were performed. The dynamic stability was analyzed by comparing the vertical deflection of the bridge, the vertical acceleration of the deck slab, and the distortion of the track calculated from the structural analysis with the limit values ​​for ride comfort and running safety presented in the Korean Design Standard (KDS). As a result, it was concluded that the complex partial girder can be applied to railway bridges with a span of 60 m and has sufficient dynamic stability.

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