高速铁路温度场作用下桥上无缝道岔与桥梁相互作用研究

发布时间：2018-07-15 10:02

【摘要】：采用通用有限元软件MIDAS/CIVIL建立郑西客运专线渭南北站桥上单开和渡线无缝道岔—桥梁有限元模型,研究温度场作用下无缝道岔与桥梁的相互作用。结果表明:在温度荷载作用下,单开道岔和渡线道岔区钢轨的纵向位移远大于横向位移,最大横向位移约为1~2mm,最大纵向位移约为20~30mm,但均小于钢轨位移允许限值40mm;单开道岔和渡线无缝道岔区钢轨的最大温度纵向力分别为1 303和1 340kN,均发生在连续梁梁缝附近约20m范围内,因此应加强该区域钢轨的监测和养护,防止出现夏季胀轨、冬季断轨的现象,且建议在梁缝处适当减小扣件阻力;单开道岔和渡线道岔区梁体的横向位移非常接近且均较小,最大值分别为2.7和2.8mm,但梁体的纵向位移差异较大,最大值分别为5.3和26.8mm,且均发生在梁端部;无缝道岔区钢轨的温度变形对桥梁的纵向和横向位移影响均很小,梁体均匀温升是引起梁体变形的主要原因,因此桥梁的养护维修可不必过于关注道岔区温度力的影响。
[Abstract]:The finite element model of seamless turnout and bridge on the bridge of Weinan North Railway Station of Zhengxi passenger dedicated line is established by using Midas / CIVIL, and the interaction between seamless switch and bridge under the action of temperature field is studied. The results show that the longitudinal displacement of the rail in the single turnout and crossing turnout area is much larger than the transverse displacement under the action of temperature load. The maximum transverse displacement is about 1 ~ 2 mm, the maximum longitudinal displacement is about 20 ~ 30 mm, but they are all less than the allowable limit of rail displacement, and the maximum temperature longitudinal forces of rail in single turnout and crossing line seamless turnout are 1 303 and 1 340 kN, respectively, which occur in continuous beam joints. Within a distance of about 20m, Therefore, the monitoring and maintenance of rail in this area should be strengthened to prevent the phenomenon of rail expansion in summer and broken rail in winter, and it is suggested that the resistance of fastener should be reduced appropriately at the joint of beam, and the transverse displacement of beam body in the area of single switch and crossing turnout is very close and small. The maximum values are 2.7 and 2.8 mm respectively, but the longitudinal displacement of the beam body is different, the maximum values are 5.3 and 26.8mm respectively, and both occur at the end of the beam, and the temperature deformation of the rail in the jointless turnout area has little effect on the longitudinal and transverse displacement of the bridge. The uniform temperature rise of the beam is the main cause of the deformation of the beam, so the maintenance and repair of the bridge should not pay too much attention to the influence of the temperature force in the turnout area.
【作者单位】：中国铁道科学研究院铁道科学技术研究发展中心;
【基金】：中国铁道科学研究院科技开发基金资助项目(2016YJ140)
【分类号】：U441.7;U213.6

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