钢桁梁桥上套轨线路板式无砟轨道结构与力学性能研究
发布时间：2018-12-29 17:17
【摘要】：本文所研究的钢桁梁桥上套轨线路板式无砟轨道位于我国黑龙江省与俄罗斯交界处。对于在钢桁梁桥上直接放置无砟轨道板,以及钢桁梁桥上套轨线路的轨道形式,目前都缺乏理论研究和工程实践。因此,本文针对钢杵梁桥上套轨线路板式无砟轨道这一结构形式,通过理论计算和室内试验的方式进行研究,得到了以下结论:1.建立了套轨线路轨道板的垂向受力分析模型,在对轨道结构的受力进行计算后,针对轨道板的承载力和配筋进行检算。轨道板的各项检算指标均在容许范围内,其在设计弯矩作用下的承载能力得到了验证。建立了钢桁梁桥上套轨线路无砟轨道系统的模态分析模型,对轨道结构的模态进行计算分析后,得到了系统前30阶模态。轨道系统的自振频率在138Hz以上,由于轨道较短,且约束状态较高,轨道的自振频率较高。轨道系统的自振频率避开了桥梁的自振频率以及列车荷载的激振频率,可以有效避免共振。2.建立了钢桁梁桥上套轨线路无砟轨道的无缝线路计算模型,对桥梁伸缩、列车制动、桥梁挠曲三种工况下的钢轨纵向力分布进行了计算分析和钢轨强度检算,对钢轨断轨工况下的断缝值进行了检算。结果显示,在桥梁温度变化幅度以及钢轨温度变化幅度较低时,能够直接铺设无缝线路;轨温及桥梁温度变化超过50℃时,就需要考虑采用特殊工程措施。另外,对特殊工况下的计算分析发现,轨道板与纵梁之间的联接阻力对各工况下的计算结果都有较为显著的影响;钢桁梁桥的下平纵联的横杆及斜杆刚度较小,在列车荷载条件下纵梁的挠度过大,会引起梁缝附件扣件的上拔力超限,建议在梁缝附近的扣件采用扣压力较大的特殊扣件或者增加下平纵联横杆及斜杆的刚度。3.通过一系列室内试验,对钢桁梁桥上套轨线路无砟轨道的安全性、稳定性、耐久性进行了验证。通过轨道板静载抗裂试验,验证了轨道板在设计弯矩下的静载抗裂性能;通过轨道结构施工工艺演示试验,验证了轨道结构施工的可行性;通过轨道结构组装疲劳性能试验,验证结构在疲劳荷载下的安全性、稳定性和耐久性;通过轨道结构应力及位移测试,在静载和动载作用下,观测轨道结构的应力和位移情况,进一步明确轨道结构的受力与变形规律。
[Abstract]:The board type ballastless track on the steel truss bridge is located at the junction of Heilongjiang Province and Russia. There is a lack of theoretical research and engineering practice for the direct placement of ballastless track slabs on steel truss bridges and for the track form of steel truss bridges. Therefore, according to the structure form of the track board type ballastless track on the steel pestle beam bridge, through theoretical calculation and laboratory test, the following conclusions are obtained: 1. The vertical force analysis model of track slab is established, and the bearing capacity and reinforcement of track slab are calculated after the calculation of the load on track structure. The load capacity of track slab under the action of design moment is verified. The modal analysis model of the ballastless track system of the track jacketed track on a steel truss bridge is established. After the modal analysis of the track structure is carried out, the first 30 modes of the system are obtained. The natural vibration frequency of track system is above 138Hz, because of the short track and high constraint state, the natural vibration frequency of track is higher. The natural vibration frequency of the track system avoids the natural vibration frequency of the bridge and the exciting frequency of the train load, which can effectively avoid the resonance. In this paper, the calculation model of seamless track for the ballastless track on the steel truss bridge is established. The longitudinal force distribution of the rail under the three working conditions of bridge expansion and expansion, train braking and bridge deflection is calculated and the rail strength is checked and calculated. The fracture value of rail under the condition of rail breaking is checked and calculated. The results show that the jointless track can be laid directly when the variation of bridge temperature and rail temperature is low, and the special engineering measures should be considered when the temperature of rail and bridge is more than 50 鈩，
本文编号：2395124
[Abstract]:The board type ballastless track on the steel truss bridge is located at the junction of Heilongjiang Province and Russia. There is a lack of theoretical research and engineering practice for the direct placement of ballastless track slabs on steel truss bridges and for the track form of steel truss bridges. Therefore, according to the structure form of the track board type ballastless track on the steel pestle beam bridge, through theoretical calculation and laboratory test, the following conclusions are obtained: 1. The vertical force analysis model of track slab is established, and the bearing capacity and reinforcement of track slab are calculated after the calculation of the load on track structure. The load capacity of track slab under the action of design moment is verified. The modal analysis model of the ballastless track system of the track jacketed track on a steel truss bridge is established. After the modal analysis of the track structure is carried out, the first 30 modes of the system are obtained. The natural vibration frequency of track system is above 138Hz, because of the short track and high constraint state, the natural vibration frequency of track is higher. The natural vibration frequency of the track system avoids the natural vibration frequency of the bridge and the exciting frequency of the train load, which can effectively avoid the resonance. In this paper, the calculation model of seamless track for the ballastless track on the steel truss bridge is established. The longitudinal force distribution of the rail under the three working conditions of bridge expansion and expansion, train braking and bridge deflection is calculated and the rail strength is checked and calculated. The fracture value of rail under the condition of rail breaking is checked and calculated. The results show that the jointless track can be laid directly when the variation of bridge temperature and rail temperature is low, and the special engineering measures should be considered when the temperature of rail and bridge is more than 50 鈩，
本文编号：2395124
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