轨道结构与桥梁共同作用力学计算模型的研究

Investigation of Mechanics Model of Interaction between Bridge and Track

轨道结构与桥梁共同作用的力学计算模型是解决轨道纵向位移阻力与梁轨相对位移相互作用计算问题的关键。本文采用平面杆系建立轨道结构与桥梁共同作用的力学计算模型 ,将轨道结构、梁体、支座、墩台、基础作为整体来考虑。桥梁和轨道的联结采用非线性梁单元模拟 ,其材料弹性模量和屈服应力通过轨道纵向位移阻力与梁轨相对位移关系的双折线化确定 ;同时为考虑梁跨挠曲对无缝线路钢轨受力的影响 ,梁跨高度采用刚臂模拟。通过对梁轨相互作用模型结构的试验结果和《铁路无缝线路》(1995年修订版 )一书中桥上无缝线路钢轨力的钢轨变形微分方程解计算算例作比较 。

The key is that to resolve the interaction between bridge and track, that the mechanics model of this interaction, as well as rail longitudinal resistance to displacement between rail and beam. This paper sets up the mechanics model of the interaction by plane bar unit. The track, beam, support, pier and base are regarded as one integrated part. The coupling between bridge and track adopts by beam unit, modulus of electricity of and yielding stress according to the broken line of the non-liner rail longitudinal resistance of displacement.The height of beams is simulated by rigid bars in consideration of the influence of the flexure of beam to CWR rails. The rationality of comparing the laboratory test and the calculation is proved.