Running safety assessment of a train traversing a three-tower cable-stayed bridge under spatially varying ground motion

Wei Gong, Zhihui Zhu, Yu Liu, Ruitao Liu, Yongjiu Tang, Lizhong Jiang

Railway Engineering Science ›› 2020, Vol. 28 ›› Issue (2) : 184-198.

Railway Engineering Science ›› 2020, Vol. 28 ›› Issue (2) : 184-198. DOI: 10.1007/s40534-020-00209-8
Article

Running safety assessment of a train traversing a three-tower cable-stayed bridge under spatially varying ground motion

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Abstract

To explore the influence of spatially varying ground motion on the dynamic behavior of a train passing through a three-tower cable-stayed bridge, a 3D train–track–bridge coupled model is established for accurately simulating the train–bridge interaction under earthquake excitation, which is made up of a vehicle model built by multi-body dynamics, a track–bridge finite element model, and a 3D rolling wheel–rail contact model. A conditional simulation method, which takes into consideration the wave passage effect, incoherence effect, and site-response effect, is adopted to simulate the spatially varying ground motion under different soil conditions. The multi-time-step method previously proposed by the authors is also adopted to improve computational efficiency. The dynamic responses of the train running on a three-tower cable-stayed bridge are calculated with differing earthquake excitations and train speeds. The results indicate that (1) the earthquake excitation significantly increases the responses of the train–bridge system, but at a design speed, all the running safety indices meet the code requirements; (2) the incoherence and site-response effects should also be considered in the seismic analysis for long-span bridges though there is no fixed pattern for determining their influences; (3) different train speeds that vary the vibration characteristics of the train–bridge system affect the vibration frequencies of the car body and bridge.

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Wei Gong, Zhihui Zhu, Yu Liu, Ruitao Liu, Yongjiu Tang, Lizhong Jiang. Running safety assessment of a train traversing a three-tower cable-stayed bridge under spatially varying ground motion. Railway Engineering Science, 2020, 28(2): 184‒198 https://doi.org/10.1007/s40534-020-00209-8

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Funding
the National Natural Science Foundation of China(51678576); the National Key R&D Program of China(2017YFB1201204); China Railway Corporation R&D Project(2015G001-G); Fundamental Research Funds for Central Universities of the Central South University(2018zzts031)

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