大跨度铁路箱型混合梁斜拉桥钢轨伸缩调节器的设置研究

Based on the principle of interaction between beam and rail and taking a new long-span railway box hybrid girder cable-stayed bridge as the engineering background, a "tower-cable-beam-track" space finite element calculation model is established for researching rail expansion joint reasonable settings. Firstly, the calculating model and related parameters are introduced. Then, the influence of rail expansion joint on additional longitudinal force and displacement is analyzed. Finally， it is concluded that setting rail expansion joint at mid-span has little impact on additional longitudinal force, setting rail expansion joint at one end of the bridge should not be considered in the practical engineering and setting rail expansion joint at both ends of the bridge can effectively reduce rail additional longitudinal forces and the relative longitudinal displacement between rail and beam.