Impact of Complex Temperature Fields on the Track-Bridge Stress Deformation Characteristics of Long-Span Suspension Bridges
To study the impact of complex temperature fields on the track-bridge stress deformation characteristics of long-span suspension bridges,this paper establishes a spatial coupling model of CWR-ballasted track-suspension bridge based on the theory of track-bridge interaction,and analyzes the track-bridge stress deformation characteristics of the long-span suspension bridge under the influence of complex temperature field.The characteristic wavelength of track irregularity is obtained by performing signal decomposition of line deformation on the bridge.Additionally,the 60m and 10m midpoint chord measurement method is employed to assess the longitudinal level and alignment regularity.The research results indicate that under the influence of complex temperature fields,there are no fixed zones for CWR on the bridge.The deformations of the track-bridge become more complex under these conditions.In the case of overall temperature rise,the track alignment is smoother,while the lateral deformation of the rails significantly decreases.Attention should be paid to the effects of local temperature gradients on lateral displacement.Under the influence of the temperature field,the vertical responses of the track-bridge are nearly completely mapped,and the lateral alignment shows good adherence to the bridge structure.The line exhibits characteristic wavelengths,with the wavelengths for longitudinal level and alignment irregularity primarily being 2.8 m,14.0 m,and 28.0 m,corresponding to the spacing of the bridge's transverse beams,the spacing between panels,and the standard panel length,respectively.Under complex temperature field,the longitudinal level and alignment regularity on the long-span suspension bridge remain in good condition.The research findings can provide references for line design on long-span suspension bridges,as well as for monitoring and maintenance of key areas.
NETL
NSTL
万方数据
