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Study on the Vertical Dynamic Characteristics of the Elastic Sleeper on Bridge

Author: DiZuo
Tutor: WangPing
School: Southwest Jiaotong University
Course: Road and Railway Engineering
Keywords: Ballasted track Elastic sleeper Wheel-rail system dynamics
CLC: U211.3
Type: Master's thesis
Year: 2009
Downloads: 91
Quote: 3
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Abstract


Ballasted track bridges and culverts of the existing railway line speed , heavy-duty development process , the problem of insufficient thickness of ballast that ballasted track , which just had a big lack of flexibility , which not only have a negative impact on ride comfort , but also increase the dynamic response of the bridge structure . In order to reduce the adverse effects of the bridge structure caused due to insufficient thickness of ballast , and improve stability by train and passenger car comfort , usually elastic sleeper laying on the bridge to be improved. Elastic sleeper pillow shape of the plate appearance , technical requirements , respectively, with the theoretical formula and the finite element method to calculate the static stiffness of the occipital plate ; elastic sleeper molding method and production process . Vehicles - orbit coupling dynamics theory , using ANSYS finite element software, analyzed and calculated elastic sleeper ballasted track and sleeper ballasted track in the same conditions as wheel-rail system components as well as the power of the bridge structure response . Comparative analysis of a case-by-case basis in response to the driving force of the of two sleeper track and bridge structure . The analysis shows that : elastic sleeper laying the bridge able to guarantee the safety of driving and smooth ; elastic sleeper track rail displacement is slightly larger than an ordinary sleeper track , but after laying heavy rail and heavy pillow can eliminate the adverse effects of the rail displacement track disease ; elastic sleeper track sleepers acceleration than the ordinary track slightly increased , but does not affect the performance of the work ; elastic sleeper can significantly reduce the the Road bed vibration acceleration , top of the track bed surface pressure , and thus can reduce the residual deformation of the track bed , ballast powder technology , etc. ; laying the elastic sleeper bridge mid-span vibration displacement than the average sleeper track reduced by 13.7 % , the vibration acceleration decreased by 8.3 % . The above work has shown that , for ballasted track bridge Road insufficient thickness of ballast , track , which just had a big problem , the laying of elastic sleeper is an effective technical countermeasures . Elastic sleeper laying on the bridge , to ensure traffic safety and comfort , and can significantly improve the dynamic performance of the beam , and help to improve the stability and durability of the bridge .

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CLC: > Transportation > Rail transport > Railway Line Project > Line theory > Line vibration
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