论文部分内容阅读
利用有限元软件ANSYS建立温度荷载作用下桥上CRTS II型板式无砟轨道结构体系各部件纵向相互作用分析模型。模型中钢轨、轨道板、底座板、梁体、桥墩均采用梁单元模拟,各结构层之间的连接采用弹簧单元模拟。以一座高速铁路混凝土连续梁桥为例,分析桥梁温度荷载作用下,轨道及桥梁结构的力学特性,并针对相关因素对各结构层受力与变形的影响进行了研究。研究结果表明:当梁体温升幅度达到一定值以后,轨道结构纵向力不再明显增大;“分离板模型”能更好反映CA砂浆黏结状态对轨道和桥梁受力特性的影响;滑动层摩擦大数增大,将大幅度增加轨道与桥梁结构的受力;轨道板宽接缝开裂导致钢轨、底座板纵向受力以及轨道板位移的增大。
The finite element software ANSYS is used to establish the longitudinal interaction analysis model of each component of CRTS II slab ballastless track structure under the action of temperature load. The beam, the rail, the base plate, the beam body and the bridge piers are all modeled as beam elements in the model. The connection between the structural layers is simulated by spring elements. Taking a high-speed railway concrete continuous girder bridge as an example, the mechanical characteristics of the track and the bridge structure under the temperature load of the bridge are analyzed. The influence of the relevant factors on the stress and deformation of the structural layers is also studied. The results show that when the temperature rise of the beam reaches a certain value, the longitudinal force of the track structure no longer increases obviously. The “split-plate model” can better reflect the influence of CA mortar bonding state on the stress characteristics of the track and the bridge; The large number of friction increases, which will greatly increase the force of the track and the bridge structure. The cracking of the wide seam of the track slab leads to the longitudinal force of the rail and the base plate and the increase of the displacement of the track slab.