Studies Of The Continuously Welded Rail On Bridge With Embedded Track For Metro

Embedded track for metro has many advantages such as:vibration and noise reduction,wheel-rail wear reduction.So that,it has vast application prospect.Laying continuously welded rail on bridge with embedded track for metro can improve the riding quality,reduce the maintenance,and also extend the service life of bridge.But we must do the reseach because there is no precedent.Based on summarizing the previous research,the feasibility and influence factor of laying continuously welded rail on bridge with embedded track for metro has been analyzed.The uplift force of embedded track for metro at the end of bridge has been studied.The main work of this thesis as follows:(1)Analyzed the principle of the continuously welded rail on bridge with emdedded track for metro.The parameter test of emdedded track for metro was carried out.And a finite element model of the continuously welded rail on bridge with emdedded track for metro has been established.(2)Determined the rail strength,the relative displacement between track slab and rail,and the rail break as the control indexes.(3)Analyzed the feasibility of laying continuously welded rail with embedded track for metro on 32m simply supported beam bridge,and compared with the normal ballastless track in metro.Meanwhile,studied the influence of bridge temperature difference,longitudinal resistance,longitudinal stiffness of piers,and bridge span on BCWR with embedded track for metro.Proposed the corresponding limits,and provided a method for designing when the bridge span is beyond the limits.(4)Reseached the influence on uplift force at beam end when laying continuously welded rail on bridge with embedded track for metro,and provided the limits of vertical rotation angle and vertical displacement at the beam end of the bridge.