小阻力扣件桥上无缝线路附加力

在铁路桥梁上铺设无缝线路，为了降低梁跨结构和钢轨之间的相互作用力，往往采用小阻力扣件。在有碴桥上无缝线路采用小阻力扣件，在钢轨、轨枕及梁跨结构三者之间将产生较明显相对位移，以往的计算模型没有考虑轨枕和钢轨相对位移的影响，与有碴轨道小阻力扣件桥上无缝线路工况存在较大偏差。在吸收国内外研究成果的基础上，建立了一种能综合考虑钢轨、轨枕、梁体三者相互作用的有碴轨道小阻力扣件桥上无缝线路附加力计算力学模型，给出了算例，对不同力学模型计算结果作了对比。计算结果表明，新模型计算结果要小于既有模型，对于柔性墩台结构，差分尤其明显。不考虑轨枕位移，该模型也适用于无碴轨道小阻力扣件桥上无缝线路附加力计算，相比有碴桥，小阻力扣件无碴桥上无缝线路附加力有较大幅度增加。

Additional longitudinal forces transmission between bridges and continuously welded rails with small resistance fasteners

To lay continuously welded rails on railway bridges,small resistance fasteners are used to be applied to reduce the mutual interaction forces between the rails and the bridges.To the ballast track,there are distinct relative displacement among the rail,sleeper and beam. However, the former mechanics model in this aspect didn't take the influence of the displacement of the sleeper into account. Thus, there are obvious discrepancy between the theory and the practice cases. A new mechanics model revealing additional longitudinal forces transmission between the continuously welded rails and the bridges, which takes the influence of the mutual relative displacement between the rail, sleeper and beam into account,is established. An example is presented and the results are compared. The results show that the calculated results of the new model are less than that of the formers,especially in the case of the flexible pier bridges. Without the consideration of the displacement of the sleeper,this model is also suited for the analysis of the additional longitudinal forces transmission between the rails and bridges of ballastless track with small resistance fasteners. The calculated results also show that compared to the ballast bridge, the ballastless bridges have a much stronger additional longitudinal forces transmission between the continuously welded rails and bridges. 1 tab,6 figs,6 refs.