Taking a typical five-span simply supported beam bridge of the high-speed railway as an example,a refined fi-nite element model of high-speed railway bridge-track is established.According to the spectral characteristics of dif-ferent types of ground motions,near-field-pulse type,near-field non-pulse type,far-field long-period type and or-dinary 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 ver-tical residual deformation in the mid-span of each span bridge is much larger than that of the pier(abutment)po-sition.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 re-duced.
high-speed railway bridge tracksresidual deformationspectral characteristicsnonlinear time history analysis
NETL
NSTL
万方数据
维普
