Citation

Tokunaga M, Ikeda M. J. JSCE 2023; 79(1): 22-00185.

Copyright

(Copyright © 2023, Japan Society of Civil Engineers)

DOI

10.2208/jscejj.22-00185

PMID

unavailable

Abstract

In the railway continuous girder, the knowledge about the dynamic response in the high-speed region has not been organized, and rational design by a practical evaluation method has been difficult. This study firstly organized and generalized the structural specifications of general railway continuous girders and, secondly, carried out comprehensive dynamic response analysis of continuous girders during train passage. The impact coefficient of the deflection of the continuous girder shows multiple maximum points at the resonance speed of each natural vibration mode. When the number of spans is odd, the 1st and 3rd modes are amplified at the resonance speed, and the number of spans is even, the 2nd mode is amplified at the resonance speed. Dominant vibration modes become unclear with the increase in the number of spans and the span length, and the impact coefficient of deflection tends to decrease in the region where the train speed is less than 400 km/h. Based on the clarified dynamic response characteristics of continuous girder, a simple evaluation method of the impact coefficient with the applicable range up to 400 km/h has been proposed, and its validity has been demonstrated.

Language: ja

Keywords

continuous girder; dynamic response; high speed railway; impact factor; resonance