有轨电车新型嵌入式轨道钢轨抗倾覆性能分析

新型钢轨嵌入式轨道中未设置扣件系统,而采用聚氨酯填充材料将钢轨嵌固于承轨槽内,故钢轨的抗倾覆性能很大程度上取决于聚氨酯材料的稳定性,必须对其进行检算。基于钢轨稳定性理论,建立三维有限元计算模型,分析列车垂向偏心荷载和横向荷载共同作用下钢轨的抗倾覆性能。研究结果表明:嵌入式轨道中钢轨的抗倾覆性能受诸多因素影响,其中垂向荷载偏心距和聚氨酯材料的弹性模量起控制作用,轨腰楔形块间距对钢轨抗倾覆性能的影响很小。荷载作用点处轨头横移量随偏心距的增大而增大,随聚氨酯材料弹模的增大而减小。为保证钢轨不致在组合荷载作用下发生倾覆,建议聚氨酯填充材料弹性模量的取值范围为5~15 MPa。

Analysis of Rail Anti-turnover Performance for New Tramcar Embedded Track

As the new rail-embedded track is not set in place with fastener system and is fixed in the rail groove with polyurethane materials,the rail anti-turnover performance is largely depended on the stability of polyurethane materials and must be calculated and confirmed. Based on the stability theory of rail,this paper establishes the three-dimensional finite element and analyzes rail anti-turnover performance under interaction of lateral load and vertical eccentric load. The results show that the rail anti-turnover performance of embedded track is affected by many factors and the vertical load eccentricity and the elastic modulus of polyurethane materials are critical; the impact of wedge block spacing is very small.The rail head traverse amount increases with the increase of load eccentricity and decreases with the increase of the elastic modulus of polyurethane materials. In order to prevent rail turnover,the suggested values of the elastic modulus of polyurethane materials are 5 ~ 15 MPa.