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针对32m简支梁桥上连续结合式无碴轨道结构,分别用换算截面法、有限元法及刚性简化计算法计算了列车活载、轨道板与底座板间温差及列车制动作用下的层间剪力,得到了层间剪力分布图,依据该图进行了层间连接件的设计。研究结果表明:在列车荷载作用下,层间剪力自梁端至跨中大致呈线性递减分布;轨道板与底座板间存在10℃温差时,层间剪力主要集中在桥梁两端5m范围内;制动力作用下,结合面上层间剪力沿跨长均匀分布,均等于作用在轨道板之上的扣件纵向分布阻力;当三者共同作用时,轨道板与底座板之间的温差起控制作用,因此,桥梁端部受温差影响较大的5m范围内应加密销钉与连接钢筋设置。
Aiming at the continuous combined ballastless track structure on 32m simply supported girder bridge, the parameters of live load, temperature difference between track plate and base plate, and the layer under train braking are calculated by using the method of section transformation, finite element method and simplified stiffness calculation respectively Between the shear force, get the shear distribution map, according to the map for the design of the interlayer connector. The results show that under the load of train, the interlaminar shear force distributes linearly and decreasingly from the beam end to the midspan. When there is a temperature difference of 10 ℃ between the track plate and the base plate, the interlaminar shear force mainly concentrates in the range of 5m ; Under the action of braking force, the shear force between the upper layers of the bonding surface is evenly distributed along the span length, which are equal to the longitudinal distribution resistance of the fastener acting on the rail plate; when the three functions together, the distance between the rail plate and the base plate The temperature difference plays a controlling role. Therefore, the end of the bridge should be protected by the temperature difference between the greater range of 5m pin and connecting steel reinforcement settings.