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机构地区:[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031
出 处:《中国安全科学学报》2011年第10期131-136,共6页China Safety Science Journal
基 金:国家自然科学基金资助(51078320);铁道部科技开发计划项目资助(2008G002-b)
摘 要:为研究轨下刚度对合金钢组合辙叉安全性能的影响规律,并选取合适的刚度值,用以指导生产设计,以12号单开道岔合金钢组合辙叉为研究对象,建立辙叉整体模型及叉心模型。基于有限单元法,分析不同轨下刚度对列车动荷载作用下辙叉的受力及变形的影响规律,且对叉心燕尾部位进行疲劳检算。结果表明,随轨下刚度增加,列车对钢轨的冲击荷载逐渐增大,钢轨所受内部拉应力及竖向变形逐渐减小。经比较,刚度值选择50 kN/mm为宜,此时,叉心燕尾处应力及疲劳检算结果显示辙叉可以满足安全使用要求。综合各安全性指标选取合适的合金钢组合辙叉轨下刚度,有助于保证辙叉自身强度和行车安全性,以改善其使用性能,延长使用寿命。To study the influence law of sub-rail stiffness on bolted alloy steel frog safety performance, and select appropriate stiffness, the No. 12 bolted alloy steel frog of single-way turnout was taken as an ex- ample in this paper to carry out all the following work. The integral model of frog and the model of the frog centre were established respectively. The rules of frog stresses and deformations influenced by different sub-rail stiffness under the train dynamic load were analyzed and compared based on the finite element method. A fatigue calculation was executed in the weak zone of the fi'og centre. Results show that, with the sub-rail stiffness increasing, the rail impact load caused by trains increases, rail tensile stress and vet- tical deformation both decrease. With the changing rule obtained from the results, appropriate sub-rail stiffness of 50kN/mm is applied. In this case, the stress and fatigue calculation results of the weak zone of the frog centre show that the frog structure can meet safety requirements. With consideration on all safety indexes, selecting proper sub-rail stiffness is greatly beneficial to guarantee frog intensity and ride comfort, which finally will improve the frog performance and lengthen its service life.
关 键 词:合金钢组合辙叉 轨下刚度 动力响应 疲劳检算 安全评估
分 类 号:X913.4[环境科学与工程—安全科学]
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