Influence of temperature on transverse dynamic displacement amplitude of a hanger in a railway arch bridge under high-speed trains

The excessive vibration of arch bridge hangers may be a potential threat for the driving safety of high-speed trains. Therefore, it is important to study the dynamic characteristics of hanger vibration under moving train loads and ambient excitations. This paper presents an analysis for the influence of temperature on high-speed railway arch bridge hangers’ transverse vibration responses using long-term field monitoring data. Firstly, the train-induced hanger’s transverse dynamic displacement amplitude is obtained through the integration of velocity, which is collected from the structure health monitoring system installed on Nanjing Dashengguan Yangtze River Bridge. Then, eight train load cases are classified, and the factors of train speed and ambient wind are excluded. Finally, the relationship of temperature and the hanger’s transverse dynamic displacement amplitude is obtained. The conclusion shows that the hanger’s transverse dynamic displacement amplitude is negative associated with the temperature. Therefore, the driving safety of high-speed trains should be paid more attention in winter.