Techno Press
Techno Press

Smart Structures and Systems   Volume 20, Number 2, August 2017, pages 197-205
Structural health monitoring-based dynamic behavior evaluation of a long-span high-speed railway bridge
D.P. Mei

Abstract     [Full Text]
    The dynamic performance of railway bridges under high-speed trains draws the attention of bridge engineers. The vibration issue for long-span bridges under high-speed trains is still not well understood due to lack of validations through structural health monitoring (SHM) data. This paper investigates the correlation between bridge acceleration and train speed based on structural dynamics theory and SHM system from three foci. Firstly, the calculated formula of acceleration response under a series of moving load is deduced for the situation that train length is near the length of the bridge span, the correlation between train speed and acceleration amplitude is analyzed. Secondly, the correlation scatterplots of the speed–acceleration is presented and discussed based on the transverse and vertical acceleration response data of Dashengguan Yangtze River Bridge SHM system. Thirdly, the warning indexes of the bridge performance for correlation scatterplots of speed–acceleration are established. The main conclusions are: (1) The resonance between trains and the bridge is unlikely to happen for long-span bridge, but a multimodal correlation curve between train speed and acceleration amplitude exists after the resonance speed; (2) Based on SHM data, multimodal correlation scatterplots of speed–acceleration exist and they have similar trends with the calculated formula; (3) An envelope line of polylines can be used as early warning indicators of the changes of bridge performance due to the changes of slope of envelope line and peak speed of amplitude. This work also gives several suggestions which lay a foundation for the better design, maintenance and long-term monitoring of a long-span high-speed bridge.
Key Words
    high-speed trains; long-span bridge; correlation of speed–acceleration; warning index of bridge performance
D.P. Mei: School of Civil Engineering, Southwest Jiaotong University, Chengdu 6177567, China;
China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan 430050, China

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