纵连板式轨道在墩台位移作用下梁轨相互作用规律研究

摘要

针对简支梁和连续梁，建立整桥系统的计算模型，对墩台位移引起的作用力作用下桥上纵连板式无砟轨道的梁轨耦合作用规律进行分析研究。研究表明：墩台位移引起的作用力是纵连式无砟轨道梁轨相互作用较重要的附加作用力，建议受日照及风荷载影响较大的高墩桥设计中考虑墩台位移引起的作用力的影响；连续梁与简支梁桥墩向右位移时所受的外荷载大致相当，轨道及桥梁各部件所受附加力也大致相等，且桥墩纵向位移越大，各部件所受附加力越大；考虑桥梁伸缩及桥墩位移的共同作用时，轨道及桥梁各部件的受力与变形均较单因素作用时量值大，且连续梁上各部件的受力与变形较简支梁大；从梁体位移方向的比较来看，当桥墩位移与桥梁伸缩方向相同时，钢轨、轨道板、端刺的受力及轨道各部件的位移较大，而当桥墩位移与桥梁伸缩方向相反时，剪力齿槽、墩台、底座板所受纵向力较大；从荷载耦合方式来看，桥梁伸缩及桥墩位移两种荷载耦合时，轨道及桥梁各部件的受力与变形要小于两种荷载单独作用后将计算结果叠加的情况，主要是由于滑动层摩阻力等线路约束阻力的塑性极限造成的。%In this paper, for the simply supported bridge and continuous bridge, the calculation model of integral bridges is established to analyze the rules of bridge-track interaction subject to the force caused by pier displacement. The results show that the force caused by pier displacement is a significant additional force between bridge and track. Thus, it is recommended that the force caused by pier displacement should be considered in the design of high-pier bridge due to great impact of sunshine and wind load. The continuous beams and simply supported beams are subjected to much the same force when their piers are shifted rightward, and various components of tracks and bridges suffer roughly equal additional forces, and larger the longitudinal displacement of piers, greater the force each additional member suffers. In case of simultaneous bridge stretching and pier shifting, the force and deformation of each member of the track and bridge are larger than those when only single factor is considered, and the force and deformation of continuous beams are larger than those of the simply supported beams. in comparison of beam displacement direction, when the displacement of bridge stretching the and pier moving are in the same direction, the force of rails, track plate, barbed end are relatively larger and the deformation of various components of tracks are relatively larger;when the bridges stretching and piers moving in the opposite direction, the shear gullet, the pier, and the base plate bear bigger longitudinal force. With respect to the point of loads coupling, when the coupling of bridges stretching and piers moving is considered, the force and displacement of track and bridge component are smaller than those when two loads are separated with the calculation of the results superposed, which is mainly due to the fact that the friction resistance of sliding layer and other tract restraining forces reach the plastic limits.