Journal of sound and vibration vol:320 issue:1-2 pages:201-220
This paper presents the in situ dynamic measurements and the experimental validation of the numerical model for the prediction of high-speed train-induced vibration. The Sesia viaduct is considered, which is a composite railway bridge consisted by seven spans. The responses of the bridge are measured both under ambient vibration and under the excitation of Italian ETR500Y high-speed trains. From the modal analysis of the ambient vibration data, two types of mode shapes are identified by operational modal analysis. Based on the dynamic behavior of the adjacent spans, the modes of the bridge can be distinguished its symmetrical and anti-symmetrical patterns, which indicates that although each span is statically decoupled, the ballast and the rails realize a connection between the adjacent spans of the bridge.