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[1]GAN Lin,GUO Endong,WU Houli,et al.Geometrical Irregularity of High-speed Railway Bridge Tracks Considering Seismic Spectrum Characteristics[J].Journal of Seismological Research,2024,47(01):27-36.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0027 ]

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Geometrical Irregularity of High-speed Railway Bridge Tracks Considering Seismic Spectrum Characteristics

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 47 Number of periods: 2024 01 Page number: 27-36 Column: Public date: 2023-11-20

Title:: Geometrical Irregularity of High-speed Railway Bridge Tracks Considering Seismic Spectrum Characteristics

Author(s):: GAN Lin¹; 2; GUO Endong¹; 2; WU Houli¹; 2; LI Changhong¹; 2; LIU Cong¹; 2; (1.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China)(2.Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,Heilongjiang,China)

Keywords:: high-speed railway bridge tracks; residual deformation; spectral characteristics; nonlinear time history analysis

CLC:: U212.35

DOI:: 10.20015/j.cnki.ISSN1000-0666.2024.0027

Abstract:: Taking a typical five-span simply supported beam bridge of the high-speed railway as an example,a refined finite element model of high-speed railway bridge-track is established.According to the spectral characteristics of different types of ground motions,near-field-pulse type,near-field non-pulse type,far-field long-period type and ordinary type are selected.The ground motions with different spectral characteristics are input,and the nonlinear time-history analysis of the structure is carried out to explore the influence of different types of ground motions on the residual deformation of the track.The results show that the ground motions with different spectral characteristics have different effects on the residual deformation of the track,and the structure is most sensitive to the near-fald pulsetype ground motion.Under the action of various types of ground motion,the transverse residual deformation law of the rail is similar,and the residual deformation is the largest in the middle part of the whole bridge.The vertical residual deformation in the mid-span of each span bridge is much larger than that of the pier(abutment)position.The position of the beam joint is the weak part of the track,and the residual deformation of the gauge has an obvious sharp mutation at the connection of the beam body of each span.When PGA>0.2 g,the track deformation under the action of various types of ground motion increases with the increase of PGA.When PGA=0.38 g,the bridge has entered the plastic state,and the influence of ground motion type on track residual deformation is reduced.

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Last Update: 2023-12-20