桥上无缝道岔纵向力计算理论与试验研究

Research on Longitudinal Force Computation Theory and Experiment of Welded Turnout on Bridge

根据桥上无缝道岔受力和变形特点,建立道岔-桥梁-墩台一体化计算模型,并利用有限元法对模型求解。以浙赣线湄池1号大桥为例,分析桥上无缝道岔的受力与变形的特性,测试桥上无缝道岔的温度力和位移。试验结果表明,理论计算结果和实测数据相吻合。理论分析和实验研究表明:所建立的道岔-桥梁-墩台一体化模型用于计算桥上无缝道岔纵向力和位移是合理可行的;桥上无缝道岔与桥上无缝线路的受力和变形差别很大,在计算桥上无缝道岔时应考虑实际的钢轨温度变化幅度、道岔布置方式和岔、桥相对位置。在道岔布置密集的区域,如车站咽喉区,道岔间的相互影响较大,为准确计算道岔及桥梁的受力和位移,应建立包括所有道岔和桥梁的整体模型。

According to the stress-deformation characteristics of welded turnouts on a bridge,the integrated turnout-bridge-abutment computation model was established;the model was solved by the finite element method.Taking the Meichi No.1 Bridge of the Zhejiang and Jiangxi Railway as an example,the stress-deformation characteristics of the welded turnouts on the Bridge were analyzed and the temperature force and displacement of the welded turnouts on the Bridge were measured.The theoretical analysis and site tests prove as follows： The calculated results are consistent with the site measurements;the integrated turnout-bridge-abutment computation model is feasible to calculate the longitudinal force and displacement of welded turnouts on a bridge;the stresses and deformations of welded turnouts on a bridge and those of CWR on a bridge differ a great deal;when calculating welded turnouts on a bridge,the actual changing magnitude of rail temperatures,the turnout layout and the relative position of turnout and bridge should be taken into consideration;the interaction between turnouts is considerable in areas with densely arranged turnouts,such as the throat zone at a station,so the integrated computation model including all the turnouts and bridges should be established,so as to calculate the stresses and displacements of the turnouts and the bridge accurately.