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Structural Engineering and Mechanics   Volume 54, Number 2, April7 2015, pages 199-219
Condition assessment for high-speed railway bridges based on train-induced strain response
Zhonglong Li, Shunlong Li, Jia Lv and Hui Li

Abstract     [Buy Article]
    This paper presents the non-destructive evaluation of a high-speed railway bridge using train-induced strain responses. Based on the train-track-bridge interaction analysis, the strain responses of a high-speed railway bridge under moving trains with different operation status could be calculated. The train induced strain responses could be divided into two parts: the force vibration stage and the free vibration stage. The strain-displacement relationship is analysed and used for deriving critical displacements from theoretical stain measurements at a forced vibration stage. The derived displacements would be suitable for the condition assessment of the bridge through design specifications defined indexes and would show certain limits to the practical application. Thus, the damage identification of high-speed railways, such as the stiffness degradation location, needs to be done by comparing the measured strain response under moving trains in different states because the vehicle types of high-speed railway are relatively clear and definite. The monitored strain responses at the free vibration stage, after trains pass through the bridge, would be used for identifying the strain modes. The relationship between and the degradation degree and the strain mode shapes shows certain rules for the widely used simply supported beam bridges. The numerical simulation proves simple and effective for the proposed method to locate and quantify the stiffness degradation.
Key Words
    condition assessment; train-induced responses; high=speed railway bridges; strin modes; structural health monitoring
Zhonglong Li, Shunlong Li and Hui Li: School of Transportation Science and Engineering, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, People\'s Republic of China
Jia Lv: Harbin Municipal Engineering Design Institute, Building 217, Dafangli, Daowai District, Harbin 150000, People\'s Republic of China

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