As the Koror-Babeldaob bridge(KB bridge) collapsed abruptly due to creep in 1996, long-term behavior problem for creep has been increased in prestressed concrete(PSC) bridge. However, the prediction of long-term behavior in PSC bridge is inaccurate due to the inaccuracy of prediction model, simplified long-term behavior analysis method, non-consideration of crack and durability.
In the meantime, the prediction for the long-term behavior is more important to railway bridge than the highway bridge(KB bridge). Recently, concrete track with more economical and excellent workability than ballasted track has been applied to railway bridge. As the deformation occurring in the prestressed concrete railway bridge deck may cause the deformation of the rail track system, long-term behavior of PSC girder should be predicted for the runnability and serviceability of railway bridge. Therefore, in this study, creep test and long-term behavior analysis were performed to obtain data to predict the long-term behavior of railway bridge. The creep test included comparative result of each parameters and creep coefficient prediction for the time-dependent deformation, creep deformation, specific creep and creep coefficient to confirm the creep properties according to concrete strength, loading age and shape of specimen. In the analysis result, long-term and maximum deflection of railway bridge were included according to the creep test parameters
In conclusion, CEB MC 90-99 model predicts more similar to that of KCI2012 in high-strength concrete. In order to apply high-strength concrete in railway bridge, KCI2012 model should be adjusted for the high-strength concrete and it is observed that concrete strength and loading age were effective to decrease deflection of railway bridge.