简支梁桥上纵连板式轨道无缝道岔温度力研究

桥上纵连板式轨道借助底座板的纵连解决梁端转角对轨道结构的不利影响,通过设置滑动层来削弱梁轨相互作用,这种设计思想对桥上铺设无缝道岔具有积极的借鉴意义.基于梁轨相互作用原理和有限元方法,采用梁单元和弹簧单元模拟各结构层,建立桥上纵连板式轨道无缝道岔纵向力计算模型,对多跨简支梁桥进行温度力计算,分析轨道板和底座板伸缩刚度变化、滑动层摩擦系数的影响.

Study on temperature stress of welded turnout of continuous-slab-track on simple supported girder bridge

With the help of the longitudinal conjunctive base plate, continuous-slab-track on bridge could remove the unfavorable influence on track structure caused by the rotation angle of beam end. Setting slide layer was a good measure to reduce the interaction between the rail and bridge, this design could offer importance reference and directive significance to lay welded turnout on bridge. Based on the principle of bridge-track interaction and the finite element method, it was used beam element and spring element to simulate each structure sheaf, built the longitudinal force calculation model of welded turnout on bridge for continuous-slab-track, calculated the temperature stress of multi-span simply supported girder bridge, analysed the influence of expanding-contracting changes of stiffness of slab （bed plate） and sliding friction coefficient.