连续梁桥上无缝道岔合理化布置研究

为了进一步研究连续梁桥上无缝道岔-梁-墩合理布置形式,基于梁轨相互作用关系,建立了"岔-板-桥-墩"一体化空间计算模型,并鳊制了相应程序.计算分析表明:连续梁跨度应适中,建议取为32 m+48 m+32 m的一联三跨连续梁,岔前或岔后距离梁端宜在20 m以上,固定支座宜布置在连续梁中间跨的两端,尽可能离岔心近一些.在需要增大桥墩刚度且又难以实现时,可考虑将连续梁相邻桥墩支座设置成双固定支座,这样同时可以起到减小桥上无缝道岔受力与变形的作用.

Study on reasonable layout of continuous welded turnout on continuous beam bridge

To the further research on the reasonable layout of the continuous welded turnout-beam-pier on continuous beam bridge,based on the beam-rail interaction,t"urnout – track slab – bridge – pier"integration model was established.The corresponding calculation program was made.The calculation showed that: the span of the continuous beam should be moderate,it was recommended to take the 32 m+48 m+32 m of a joint three-span continuous beam,the distance between the front or the end of the continuous welded turnout and tip of the beam should be 20 m or more,fixed bearing should be arranged in both ends of a continuous beam across the middle,close to the centre of the turnout as much as possible.When it was needed to increase the stiffness of the pier but was difficult to achieve,the adjacent piers of the continuous beam could be considered to set double fixed bearing,and it could also serve to decrease the force and the deformation of the continuous welded turnout on the bridge.