Abstract
The structure of a high-speed railway (HSR) bridge with a track system is complex, and the computational efficiency of seismic analysis for a refine HSR bridge with a track system model (BM) is low. This study considers an HSR bridge with CRTS II slab ballastless track system as a case study and develops a simplified model (SM) based on a method for simulating track constraints with equivalent springs. To obtain the optimal equivalent springs stiffness of SM, a finite element structural parameters updating framework utilizing an improved genetic algorithm is established, and the updated SM's dynamic characteristics and seismic response are compared to BM's. In addition, it uses SM to analyze the over-limit state and applicability of the bridge structural essential components. The results indicated that the model simplification ratio of SM reaches 95%. The seismic response results of SM and BM accurately agree with an average relative error of 3% and a maximum relative error of less than 5%. The over-limit state of the structure seismic response tends to be stable as the number of ground motion samples increases. The shear and bending capacity of the pier and the deformation of the fixed support have a high over-limit risk under longitudinal seismic, which is worth noting in the engineering design.
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Funding
This study was funded by the National Natural Science Foundations of China (U1934207, 52078487, 52178180, 52268074), the National key research and development plan project (2022YFC3004300), the China Railway Corporation Limited Science and technology research and development program (2020-major-02), the Transportation Science and Technology Project of Hunan (202011), the Frontier cross research project of Central South University (2023QYJC006).
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Jiang, L., Zhong, B., Zhou, W. et al. Simplified linear analysis model of longitudinal constraint effect of high-speed railway simply-supported bridge under frequent earthquake. Bull Earthquake Eng 22, 1827–1853 (2024). https://doi.org/10.1007/s10518-023-01839-z
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DOI: https://doi.org/10.1007/s10518-023-01839-z