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

Autor: Yu Liu, Ruitao Liu, Lizhong Jiang, Wei Gong, Zhihui Zhu, Yongjiu Tang
Rok vydání: 2020
Předmět:
Zdroj: Railway Engineering Science, Vol 28, Iss 2, Pp 184-198 (2020)
ISSN: 2662-4753
2662-4745
DOI: 10.1007/s40534-020-00209-8
Popis: 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.
Databáze: OpenAIRE
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