Running safety of high-speed railway kilometre-level suspension bridge under earthquake

LEI Hujun1,2, LIU Wei1, HUANG Bingkun1

Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 249-255.

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PDF(1889 KB)
Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 249-255.

Running safety of high-speed railway kilometre-level suspension bridge under earthquake

  • LEI Hujun1,2, LIU Wei1, HUANG Bingkun1
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Abstract

In order to study the running safety of trains on a super-long-span railway suspension bridge under earthquake, taking the scheme of a highway-railway suspension bridge with a main span of 1 120 m as the research object, the full bridge lattice model was established by using the virtual crossbeam method, and the correctness of the grillage model was verified by the plate-beam combination model.On this basis, by inputting seven seismic waves, the train-track-bridge-seismic analysis program TTBSAS was used for simulation calculation, the dynamic response characteristics of suspension bridge-train system under uniform excitation and traveling wave excitation were studied, and the running safety of the train crossing the bridge was analyzed.The results show that for the suspension bridge-train system, the influence of the earthquake on the dynamic response of the bridge and track is greater than that of the vehicle, and the lateral earthquake not only causes the large lateral vibration of the steel truss girder and the track on the bridge, but also induces the additional torsional vibration of the main girder.Without considering the seismic traveling wave effect, the safety index of the train will be seriously underestimated.According to the calculation conditions of this paper, the most unfavorable traveling wave speed for the study of train safety on the bridge is 500 m, and the safe speed threshold of the train passing through the main span 1 120 m suspension bridge under the action of 0.15 g design earthquake is 300 km/h.

Key words

high-speed railway / suspension bridge / vehicle-bridge coupled vibration / traveling wave effect / running safety

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LEI Hujun1,2, LIU Wei1, HUANG Bingkun1. Running safety of high-speed railway kilometre-level suspension bridge under earthquake[J]. Journal of Vibration and Shock, 2020, 39(10): 249-255

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