Crosswind safety analysis for atrain running on abridge based on reliability theory

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 226-231.

ZHANG Tian1,2, ZHANG Nan3, WANG Shaoqin4, XIA He3

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Abstract

Based on the theory of reliability, the running safety of a high-speed train on a bridge under wind loadswas analyzed, and the failure probability was used to evaluate the crosswind safety of the train on the bridge.Firstly,aerodynamic coefficients of the train and bridge obtained withwind tunnel testswereused to calculate aerodynamic forces acting on the train and the bridge.Then, the analysis model for the train-bridge coupled system under wind loadswas established, and safety evaluation indices for the train running on the bridgeat different velocitieswere calculated under different average wind speeds.Finally, the failure probability of the high speed train running on the bridgewas calculated based on the reliability theory.A 10-span simply-supported U-shape girder bridge of Lanxin Railway was taken as an example to analyze the failure probability of the high speed train running on the bridge under crosswind.The results were compared with those using the deterministic analysis method.The results showed that with increase in train running velocity and average wind speed, the failure probability of the train-bridge coupled system increases; failure probability of trail-car is larger than that of motor-car at the same train running velocity and average wind speed;the train characteristic wind curve for motor-carobtained with the deterministic methodis roughly equivalent to theprobabilistic characteristic wind curve of the train with failure probability of 0.1, whilethat for trail-car is corresponding to one with lower failure probability.

Key words

bridge engineering / high-speed train / running safety / reliability theory / wind load / failure probability

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ZHANG Tian1,2, ZHANG Nan3, WANG Shaoqin4, XIA He3. Crosswind safety analysis for atrain running on abridge based on reliability theory[J]. Journal of Vibration and Shock, 2019, 38(17): 226-231

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