Abstract
Introduction of new high-speed trains and low stiffness girders such as PRC ones requires reviewing the present technical design standards of railway bridges and viaducts from a viewpoint of dynamic response of girders as well as of train run comfort. In this study, dynamic interaction of train and continuous concrete girders is formulated and parametric simulations are made extensively. The results are compared with the dynamic responses of 21 existing bridges and good agreement is presented. The resonance of the girder under the passage of train with the speed of 500km/h is also confirmed. The damping ratio of concrete girders is found to be as low as 0.01 and the value of 0.02 is suggested to use in simulations and design. Dynamic response of running trains is compared with the results of the field measurement of 17 bridges and good agreement is also found. The filed measurement shows that the maximum acceleration of trains during the passage of bridges is below 1.5m/s2, indicating good ride condition and implication of this result in conjunction with the design standards is discussed.
