Study on the Influence of Late-stage Creep Sensitivity of High-speed Railway Ballastless Track Bridges on the Pre-camber of the Completed Bridge
In order to study the influence of concrete creep deformation on the pre-camber of the bridge structure,the Wangjiahe Bridge in Tongchuan City,Shaanxi Province,which has the largest structural span and the highest pier of the same type of high-speed railway ballastless track bridge in China,the finite element model of the full bridge was established by Midas civil software.The sensitivity of parameters of prestress and concrete self-weight on creep deformation and stress were studied by orthogonal design method.Then,the bridge suspender force was opti-mized by the unknown load coefficient method.The influence of the optimization plan on the later creep deformation was studied.Finally,the pre-camber of the completed bridge considering the late creep and the standard calculation value were compared and analyzed.The analysis results show that when multiple parameters work together,prestress and concrete self weight have a significant impact on creep deformation;That extending the beam storage time and loading age make the later creep deformation small and slow,which is more conducive to controlling the track smoothness;The optimized boom force can significantly reduce the bending moment and deformation of the main beam and main arch,and the late-creep is also significantly reduced;Considering the creep effect,the pre-camber amplitude significantly reduces,and the linear shape of the bridge structure is smoother.
high-speed railway bridgeballastless trackscreep deformationparameter sensitivitythe suspender force optimizationpre-camber of the completed bridge
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