A Study of Optimum Section of PSC Girder Railway Bridge according to Variation of Span Length

지간장 변화에 따른 프리스트레스트 콘크리트 거더 철도교의 최적단면에 관한 연구

Prestressed concrete girder(PSC girder) bridges have been used widely at the railway as well as highway because they are great in the functional and economical efficiency. Also they have the advantage of convenience of design and construction. Generally, the PSC girder railway bridges with span length 25m are adopted in the country and it could be easily verified that the section of PSC girder using railway bridge is excessive design, which has much redundancy against design loads. Thus, in this paper the optimum design for PSC girder railway bridge with span length 30m is performed. And from the results of analysis it is suggested to denote the optimum section which satisfies the structural safety and economical efficiency all together.