Abstract
The track structure has an effect on the dynamic characteristics of the bridge structure, which makes the seismic response of the bridge structure complicated. In this paper, an assessment method is proposed to evaluate the seismic risk of bridge structure, including over-limit risk and over-limit scale. Based on a newly proposed simplified model with high accuracy and high computational efficiency, a total of 3000 calculation conditions are analyzed and the sample stability of response is validated to ensure the reliability of the seismic risk analysis. The seismic risks in the longitudinal direction of the track-bridge model are compared with that of the trackless model, and the influence of the constraint effect of China Railway Track System II ballastless track structure on the seismic risk of the structure is obtained. The influence of the number of spans and PGA on track constraints is also revealed. The analysis results, based on a large number of samples, show that although track constraints can reduce the seismic risk of some phenomenon, such as girders' collision, the expected enhancement of longitudinal seismic safety of the system cannot be guaranteed in general, especially when the number of spans is large. However, it is noted that the track constraint can effectively control the over-limit scale of the system, which can reduce the expected repair cost after an earthquake. Therefore, it can be considered that the positive effect of the track constraints is more significant in economy than in structural safety when the bridge is subjected to a longitudinal earthquake excitation.
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This study was funded by the National Natural Science Foundations of China (U1934207, 52078487 and 51778630), the Innovation-driven Plan in Central South University (2020zzts159).
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Zhang, Y., Jiang, L., Zhou, W. et al. Study of the track constraint effect on the seismic risk in longitudinal direction of high-speed railway multi-span simply-supported beam bridge. Bull Earthquake Eng 22, 2739–2768 (2024). https://doi.org/10.1007/s10518-023-01845-1
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DOI: https://doi.org/10.1007/s10518-023-01845-1