随着CRTSⅡ型板式无砟轨道结构服役时间的延长,层间离缝发生发展对轨道结构和行车安全的影响成为迫切需要解决的问题之一.为厘清不同程度的层间离缝对车辆-无砟轨道系统动力特性的影响程度,建立了考虑层间离缝的车辆-CRTSⅡ型轨道板的耦合动力学模型,用ABAQUS和Simpack联合仿真,研究了不同尺寸的单一离缝以及多离缝不同位置组合对车辆及轨道结构动力响应的影响.结果表明,单一离缝横向深度和纵向长度分别在 522 mm、1.275 m 及以上时,离缝发展明显加快;多离缝的不同位置组合中板端与板边组合为最不利情况.研究结论为高速铁路轨道结构运维提供参考价值.
Study on Dynamic Characteristics of Vehicle-CRTS Ⅱ Slab Ballastless Track Coupling System Under Interlayer Split
With the extension of service time of CRTS Ⅱ slab ballastless track structure,the impact of inter-layer joints on track structure and traffic safety has become one of the urgent problems to be solved.In order to clarify the degree of influence of different degrees of interlayer separation on the dynamic characteristics of the vehicle-ballastless track system,a coupled dynamics model of vehicle-CRTS Ⅱ track slab considering interlayer joints is established,and the effects of single joints with different sizes and multiple joints with different combi-nations of positions on the dynamic response of the vehicle and the track structure are investigated through the joint simulation of ABAQUS and Simpack.The results showed that the development of a single departure seam was significantly accelerated when the transverse depth and longitudinal length of the seam were 522 mm and 1.275 m and above,respectively.The most unfavorable combination of different positions of the multi-seam is the combination of the plate end and the edge of the slab.The conclusions of the study provide a reference value for the operation and maintenance of high-speed railroad track structures.
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