论文部分内容阅读
CRTSIII型板式无砟轨道底座板上设置限位凹槽与上部自密实混凝土凸台相结合,以实现结构层之间的传力、限位功能。该文利用有限元软件建立了路基上CRTSIII型板式无砟轨道空间静力分析模型,并利用自主开发的FOSYS动力分析程序建立了车辆-轨道耦合动力学模型,对两种主要凹槽设置方案的轨道结构静、动力学特性进行了对比研究。结果表明:1)温度、车辆、基础沉降荷载作用下,两种方案的结构受力变形略有差异,但均在合理范围内;2)当自密实混凝土与底座板间土工布层摩擦作用不足时,双槽方案结构横向稳定性明显强于单槽方案;3)动力荷载作用下,两方案的动力学指标均满足高速铁路设计规范要求,凹槽设置方式对于轨道结构动力学特性影响较小。综上,两种凹槽设置方案均具有一定可行性,考虑长期使用条件下双槽方案横向稳定性更佳,推荐使用双槽方案。
CRTSIII plate ballastless track base plate set limit grooves and the upper self-compacting concrete bosses combined in order to achieve the transmission between the structure layer, the limit function. In this paper, the finite element software was used to establish the space static analysis model of CRTSIII ballastless track on subgrade, and the vehicle-track coupling dynamics model was established by using the self-developed FOSYS dynamic analysis program. The two main groove setting schemes The static and dynamic characteristics of orbit structure are compared. The results show that: 1) the structure deformation of the two schemes is slightly different under the load of temperature, vehicle and foundation subsidence, but all of them are within a reasonable range; 2) When the friction between the self-compacting concrete and the base plate is insufficient , The lateral stability of double-deck scheme is obviously stronger than that of single-slot scheme. (3) Under the dynamic loads, the dynamic indexes of the two schemes all meet the requirements of high-speed railway design code. The groove arrangement has little effect on the dynamic characteristics of orbital structure . In summary, the two kinds of groove arrangement scheme are feasible, considering the long-term use of dual-groove scheme lateral stability better, we recommend the use of dual-slot scheme.