궤도구조 변경에 따른 열차 진동 추정식 제안

This research estimated decreased vibration level as quantitative according to change of track system on Seoul Subway Line No. 1 from existing ballasted track system(Pandrol type clip) to concrete track system(Youbgdan type isolation rubber clip). Following change to concrete system, vibration level at tunnel floor decreased between 4-8dB(V). Vibration equations suggested in this paper consider the velocity of train and can estimate quantitative vibration response. These are divided by ultimate limit state(β=0), serviceability limit state(β=1.28) and safety state(β=3), respectively The reliability index, β=0, means 50% data line obtained by least squares best-fit line. The reliability index β=1.28 and 3 represent boundaries below 90% and 99.9% respectively.