Comfort Evaluation of Railway Bridge Vibration using Bridge-Train Transfer Function

초록

This paper aims for analyzing bridge vibration serviceability due to a train by simply expressing its vertical vibration when it passes a railway bridge for proposed comfort deflection limit of railway bridge. Therefore, the bridge-train transfer function was developed with the assumption that train model is a single mass-spring system, and bridge-train interaction analysis was performed by moving constant force, SDOF(single degree of freedom) and 3-dimensional systems of KHST(Korea High-Speed Train) passenger car. And the vertical acceleration signals of passenger cars obtained from bridge-train interaction analysis were compared with each acceleration signal. Next, the vertical velocities, vertical accelerations and maximum vertical accelerations were developed with the assumption that deflections of bridge were sin waves. Then maximum vertical deflections converted from maximum vertical accelerations. Finally, apply transfer function and bridge comfort limit considering serviceability due to bridge vibration to maximum vertical accelerations. As a result, comfort deflection limit of railway bridge was developed.