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

Hyejin Yoon, Won Jong Chin, Jae Yoon Kang, Jongwon Kwark, Eui-Seung Hwang

Department of Civil Engineering, Kyung Hee University, Goyang, South Korea.
Structural Engineering Research Division, Korea Institute of Construction Technology, Goyang, South Korea.

DOI: 10.4236/eng.2013.59090                

Abstract

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.

Keywords

High-Speed Railway; Dynamic Response; Impact Factor; Moving Average Method

Conflicts of Interest

The authors declare no conflicts of interest.

References

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[5]	Korea Institute of Construction Technology, “Development of Stabilization Techniques for Track Construction System of the High-Speed Railway,” Ministry of Construction Transportation, 2007.