TITLE:
Comparison of Measured and Dynamic Analysis Vertical Accelerations of High-Speed Railway Bridges Crossed by KTX Train
AUTHORS:
Hyejin Yoon, Won Jong Chin, Jeong-Rae Cho, Jae Yoon Kang, Jongwon Kwark
KEYWORDS:
High-Speed Railway Bridge; Vertical Acceleration; Dynamic Response
JOURNAL NAME:
Engineering,
Vol.5 No.9,
August
29,
2013
ABSTRACT: Since high-speed railway bridges are subjected to cyclic
loading by the continuous wheel loads traveling at high speed and regular
spacing, their dynamic behavior is of extreme importance and has significant
influence on the riding safety of the trains. To secure the
riding safety of the trains, advanced railway countries have limited the
vertical acceleration of the bridge slab below critical values at specific
frequency domains. Since these limitations of the vertical acceleration
constitute the most important factors in securing the dynamic safety of the
bridges, these countries have opted for a conservative approach. However, the
Korean specifications limit only the size of the peak acceleration without
considering the frequency domain, which impede significantly rational
evaluation of the high-speed railway bridges in Korea. In addition, the
evaluation of the acceleration without consideration of the frequency domain is
the cause of disagreement between the dynamic analysis and measurement results.
This study conducts field monitoring and dynamic analysis on high-speed railway
bridges to gather the acceleration signals and compare them. Significant
difference in the size of the vertical acceleration was observed between the
measured and dynamic analysis accelerations when discarding the frequency
domain as done in the current specifications. The comparison of the
accelerations considering only low frequencies below 30 Hz showed that the
dynamic analysis reflected accurately the measured vertical acceleration.