高速铁路千米级主跨悬索桥线-桥垂向变形映射关系分析

Analysis of Vertical Deformation Mapping Relationship between Track and Kilometer Span High⁃speed Railway Suspension Bridge

为研究千米级悬索桥线-桥垂向变形映射关系,逐层分析有砟轨道层间传力特性,建立悬索桥垂向变形与轨面几何形态的映射解析模型,并对映射模型的准确性和有效性进行验证。研究结果表明:桥梁变形波长大于16 m时,线-桥垂向变形可视为完全映射,波长小于16 m时,线-桥位移有所差异;扣件和道床刚度主要影响波长16 m以下的线-桥垂向变形映射关系;悬索桥上线路平顺性表现出显著的温度敏感性,影响桥上线路垂向不平顺的主要因素依次为主缆、主塔、吊杆和主梁;墩塔沉降作用下桥上线路产生不平顺的主要范围集中在桥梁边跨和主塔附近;桥上线路特征波长主要为28、14、28、56 m,分别对应桥梁的横梁间距、节间间距、标准节间长度和4倍节间间距。

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 28 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.