철도교량의 현장측정 감쇠비 산정에 따른 동적응답 비교

초록

Damping ratio is one of the most dominant factor for deciding dynamic responses of the railroad bridge especially in the vicinity of resonance. However, it is difficult to decide from results of measured responses of dynamic vertical displacements or accelerations. Therefore, for convenience of design and analysis of structures, damping ratio is assumed as one value. For example, Eurocode and Korean railroad bridge specification declare damping ratio as 1.0% for PSC structures. In the present study, we try to compare dynamic responses of field tests and analyses. To reduce relatively large differences between field tests and analyses, we re-estimate damping ratio with more credible method and dynamic displacements and dynamic accelerations of railroad bridge are investigated again.