Computation of Impact Factor of High-Speed Railway Bridge by KTX Train Riding Test


The design live load of railway is divided into common railway and high-speed railway separately inKorea. Accordingly, the Korean design specification of railway specifies the impact factor for common railway and high-speed railway respectively. The impact factor for high-speed railway is based on Eurocode. Since the impact factor criteria inKoreawere established by adopting those of the Eurocode and without dedicated investigation relying on research results reflecting the domestic circumstances, thorough examination should be implemented on these criteria. Therefore the evaluation of impact factor based on field tests is required. Both dynamic and static vertical displacements are necessary to compute the impact factor. The dynamic response can be obtained from the measurement of deflection of the bridge slab crossed by the firstKoreahigh-speed train (KTX, Korea Train eXpress) running at high-speed. The main difficulties encountered are in obtaining static response because static response corresponds to the response of the bridge when the train remains immobile on the bridge or crosses the bridge at speed slower than5 km/hr. This study introduces the static response derived by applying the moving average method on the dynamic response signal. To that goal, field measurements was conducted under train speeds of5 km/hr and ranging from100 km/hr to300 km/hr on Yeonjae Bridge located in the trial section of the Gyeonbu High-Speed Railway Line before its opening. The validity of the application of the moving average method is verified from comparison of measured static response and derived static response by moving average method. Moreover, evaluation is conducted on the impact factor computed for a bridge crossed by the KTX train running at operational speed.

Share and Cite:

H. Yoon, W. Chin, J. Kang, J. Kwark and E. Hwang, "Computation of Impact Factor of High-Speed Railway Bridge by KTX Train Riding Test," Engineering, Vol. 5 No. 9, 2013, pp. 751-755. doi: 10.4236/eng.2013.59090.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Korea Railway Network Authority, “Design Specification of Railway,” Ministry of Construction Transportation, 2011.
[2] ERRI Specialists’ Committee D214, “Rail Bridges for Speeds > 2000 km/h, Final Report: Part B Proposed UIC Leaflet,” European Rail Research Institute, 1999.
[3] EUROCODE 1 Part 2, “Actions on Structures: General Actions—Traffic Loads on Bridges,” European Committee for Standardization.
[4] Korea Institute of Construction Technology, “Development of Safety Techniques for High Speed Railway Structures,” Ministry of Construction Transportation, 2002.
[5] Korea Institute of Construction Technology, “Development of Stabilization Techniques for Track Construction System of the High-Speed Railway,” Ministry of Construction Transportation, 2007.

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.