Vibration response of track-bridge system and effects of crack depth at bridge top slab under a train speed of 400 km/h

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (3) : 91-98.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Vibration response of track-bridge system and effects of crack depth at bridge top slab under a train speed of 400 km/h

MENG Xin1,2, GAO Hao3, LIU Penghui*1,2, GOU Hongye3, WANG Yigan1,2, YANG Yiqian1,2

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Abstract

In order to explore the vibration response of high-speed railway track-bridge system under 400 km/h running speed, taking a high-speed railway bridge as the research object, the vertical acceleration measuring points are arranged at the key positions of the bridge-track system and the pier. The variation of the acceleration of the bridge-track system under multi-stage speed is explored. On this basis, with the help of structural sound intensity and train-track-bridge coupling vibration analysis, the influence of crack depth of the lower edge of the top slab is proposed from the perspective of vibration energy and acceleration. The results show that the peak acceleration of the rail, bridge top slab and pier is 800 m/s2, 4 m/s2 and 0.5 m/s2 respectively under the excitation of multiple unit train. The acceleration decreases from the rail to pier, with the increase of running speed, the acceleration of each measuring point is also linear increasing. The cracks will increase the peak acceleration of the lower edge of the bridge top slab and change the distribution of vibration energy. When the crack depth is greater than 45 mm, the acceleration and vibration energy are 1.1 times and 1.5 times of those without cracks, respectively, attention should be paid to strengthening the observation of the crack state. The research results can provide a basis for the train-track-bridge coupling analysis, and can also provide a guidance for the cracking maintenance of the lower edge of the simply supported box girder top slab of high-speed railway.

Key words

bridge-track response / train-track-bridge coupled analysis / structural sound intensity / vibration energy / crack

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MENG Xin1, 2, GAO Hao3, LIU Penghui1, 2, GOU Hongye3, WANG Yigan1, 2, YANG Yiqian1, 2. Vibration response of track-bridge system and effects of crack depth at bridge top slab under a train speed of 400 km/h[J]. Journal of Vibration and Shock, 2025, 44(3): 91-98

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