Influence of special additional deformation on high-speed train dynamic responses on an ultra-large span railway bridge

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (20) : 10-17.

SUN Zhi'ang1,2，YANG Xinwen1,2，ZHAO Wenbo3，QI Zhigang4

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Abstract

Special boundary conditions such as high temperature difference cause additional track-bridge deformation, which affects track geometry and increases instability risk of high-speed train. Based on the long-term monitoring data and field testing of a certain Yangtze River bridge in China, extremes of temperature and wind speed data since the operation were introduced and characteristics of track geometry and dynamic responses were analyzed. A finite element model to analyze the influence of additional deformation on track geometry was established. United simulation method, which is composed of Finite Element Method and Multi-body Dynamics Analysis, laid the foundation of explaining the influence of temperature difference on dynamic responses of high-speed train. The results show that: (1) The long-term monitoring data show that the maximum temperature is 41.3℃ and the minimum temperature is -8.9℃; the maximum temperature sudden rise is 4.9℃, and the maximum temperature sudden fall is -10.7℃. (2) Track geometry and TQI index of the Yangtze River Bridge was in a good state. Wheel-rail responses and vehicle vibration satisfied requirements. (3) The extreme temperature difference causes the rail expansion to reach a maximum of 630.19mm, and the maximum longitudinal level of rail to reach 19.89mm, which is beyond the limit, resulting in eccentric loadings. The vertical Sperling index in the areas of piers and Rail Expansion Joints reaches 2.72, and lateral swing of the vehicle also becomes more obvious.

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high-speed railway / long-span bridge / temperature difference / train dynamic response

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SUN Zhi'ang1, 2, YANG Xinwen1, 2, ZHAO Wenbo3, QI Zhigang4. Influence of special additional deformation on high-speed train dynamic responses on an ultra-large span railway bridge[J]. Journal of Vibration and Shock, 2024, 43(20): 10-17

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