简支梁桥上嵌入式轨道无缝线路优化分析

Optimization analysis on embedded track continuous welded rail on simple supported beam bridge

为分析有轨电车嵌入式轨道桥上无缝线路梁轨相互作用机理并获得最优参数组合,根据梁轨相互作用原理,建立了多跨简支梁桥上嵌入式轨道桥上无缝线路力学分析模型,采用正交试验方法研究钢轨类型、高分子材料纵向阻力、桥墩纵向刚度、桥台纵向刚度和桥梁跨数这5种因素对嵌入式轨道桥上无缝线路力学特性的影响.研究结果表明：采用小阻力高分子材料可明显减小钢轨附加作用力,但轨板相对位移和断缝值有较大增长;当高分子材料纵向阻力约为5.0×10^6 N/m时,轨板相对位移达到限值,高分子材料产生拉裂破坏;最佳简支梁桥上有轨电车嵌入式轨道无缝线路设计方案为钢轨类型60R2槽型轨、高分子材料纵向阻力2.0×10^7 N/m、桥墩纵向刚度3.0×10^7 N/m、桥台纵向刚度2.0×10^8 N/m,桥梁跨数根据实际工程而定.

In order to study the beam-rail interaction mechanism and obtain the best combination of design parameters of tram embedded track continuous welded rail on bridge,according to the principle of beam-rail interaction,the mechanics analysis model of embedded track continuous welded rail on multi-span simply supported girder bridge was established.Influences of five factors,including rail type,longitudinal resistance of polymer material,longitudinal stiffness of pier,longitudinal stiffness of abutment and bridge span,on the mechanical properties of embedded track continuous welded rail on bridge were studied with orthogonal test method.Research results show that rail additional force can be obviously reduced by using small resistance polymer material,while rail-plate relative displacement and rail broken gap increase greatly.When longitudinal resistance of polymer material is about 5.0×10~6 N/m,rail-plate relative displacement reaches the limit and polymer material is cracked.The best design scheme of optimal tram embedded track continuous welded rail is as follows：rail type 60R2 grooved rail,longitudinal resistance of polymer material 2.0×10^7N/m,longitudinal stiffness of pier 3.0×10^7 N/m,longitudinal stiffness of abutment 2.0×10^8 N/m and bridge span depending on the actual project.