Analysis of Vertical Deformation Mapping Relationship between Track and Kilometer Span High-speed Railway Suspension Bridge
In order to study the track-bridge verticle deformation mapping relationship of kilometer span suspension bridge,the interlayer force transmission mechanism of ballasted track was analyzed.The vertical deformation mapping analytical model between suspension bridge and the geometric shape of track surfaces was established with the accuracy and effectiveness of the analytical model being verified.The results show that in the case of the wavelength of bridge de-formation greater than 16 m,bridge deformation can be completely mapped to the rail surface.In the case of the wave-length less than 16 m,rail displacement is different from that of bridge.The stiffness of fastener and ballast bed mainly affects the vertical deformation mapping relationship of track-bridge below 16 m wavelength.The regularity of the track on the suspension bridge shows a significant temperature sensitivity.The main factors that affect the vertical irregularity of the track on the suspension bridge are in the order of the main cable,main tower,suspenders and main beam.The main areas of the track irregularity produced under the settlement condition of the pier and tower are concentrated near the side span and main tower of the bridge.The characteristic wavelengths of the track on the bridge are mainly 2.8 m,14 m,28 m and 56 m,which correspond to the cross beam spacing,deck section spacing,the length of the standard deck section and the four times length of the deck section spacing,respectively.
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