@article{ref1,
title="Running safety assessment of a train traversing a three-tower cable-stayed bridge under spatially varying ground motion",
journal="Railway engineering science",
year="2020",
author="Gong, Wei and Zhu, Zhihui and Liu, Yu and Liu, Ruitao and Tang, Yongjiu and Jiang, Lizhong",
volume="28",
number="2",
pages="184-198",
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.<p /> <p>Language: en</p>",
language="en",
issn="2662-4745",
doi="10.1007/s40534-020-00209-8",
url="http://dx.doi.org/10.1007/s40534-020-00209-8"
}