大跨度连续梁拱组合桥梁轨互制特征

为研究大跨度连续梁拱组合桥梁轨相互作用特征,以梅汕线上某(34+160+34)m刚架系杆拱钢箱连续梁组合桥为背景,采用理想弹塑性模型模拟线路纵向阻力,建立"轨-拱-梁-墩"一体化空间模型,对钢轨纵向力的分布规律进行分析,对是否考虑轨道作用下的主梁应力、梁端转角、墩底纵向反力进行比较。结果表明:连续梁拱组合桥远离固定支座的梁端处钢轨纵向力较大,其中最大伸缩应力达到114.0 MPa,在不设钢轨伸缩调节器时钢轨强度仍满足要求;轨道结构对温度荷载和制动力作用下的主梁应力影响较大;轨道结构对梁端转角及墩底纵向反力的分配亦有较大影响。

Track-bridge Interaction of Combination Bridge with Long-span Continuous Beam Arch

To study the characteristics of track-beam interaction of the combination bridge with long-span continuous beam arch,a rigid frame arch combination bridge with( 34 + 160 + 34) m continuous steelbox girder tied-arch on Meizhou- Chaoshan railway line is referenced. A track-arch-beam-pier integration space model is established to simulate track longitudinal resistance with ideal elastic-plastic model. The distribution of track longitudinal force is analyzed. The girder stress,the rotation angle at bridge end,and the longitudinal reaction at pier bottom are compared with or without track effects.Results show that rail longitudinal force is great at the beam end farther away from the fixed support of the combination bridge with continuous beam arch; the maximum expansion stress reaches to 114. 0 MPa,but the rail strength meets the requirements without rail expansion devices; the track structure has great impact on the stress of girder under the action of temperature load or braking force and it also has great impact on rotation angle at bridge end and on the distribution of longitudinal reaction at pier bottom.