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为研究无砟轨道道床开裂后结构受力,将混凝土道床简化为黏弹性连续支承梁,引入损伤函数表达道床裂纹,基于轮轨系统动力学理论,建立考虑道床裂纹的车辆-双块式轨道垂向耦合动力学模型,计算分析了高速车辆通过具有半波余弦不平顺轨道时的振动响应,并分析了车辆速度对轨道有无裂纹时振动的影响。结果表明,道床裂纹对车辆和钢轨的振动影响很小,而对道床本身及其下部结构的振动影响较为显著,道床动弯应力和路基面动应力随着车辆速度的增大而明显增大。
In order to study the structural stress of the ballastless track bed after cracking, the concrete track bed is simplified as a viscoelastic continuous beam, the damage function is introduced to express the crack in the ballast bed. Based on the dynamic theory of the wheel-rail system, a two- To the coupled dynamic model, the vibration response of high-speed vehicle passing through the track with the half-wave cosine irregularity is calculated and analyzed, and the influence of vehicle speed on the vibration of the track with or without cracks is analyzed. The results show that the crack of the track bed has little effect on the vibration of the vehicle and the rail but has a significant impact on the vibration of the track bed itself and its substructure. The dynamic bending stress of the track bed and the dynamic stress of the road surface obviously increase with the increase of vehicle speed.