重载铁路非等跨简支梁桥上无缝线路纵向力研究

发布时间：2018-01-25 11:25

本文关键词： 重载铁路铁路桥梁简支梁无缝线路纵向力　出处：《铁道标准设计》2017年05期 　论文类型：期刊论文

【摘要】：为研究重载铁路非等跨简支梁桥上无缝线路纵向力的分布规律,建立6-32 m+40 m+6-32 m(30 t轴重)重载铁路简支T梁与轨道相互作用有限元模型,与13-32 m简支梁桥相对比,研究温度、竖向活载、列车制动及地震作用下系统的受力和变形特征,探讨非等跨简支梁(40 m简支梁)对系统的影响规律。研究表明,各类荷载作用下,钢轨应力峰值多集中在各简支梁相接处及跨中位置;地震作用下,钢轨和墩底承受着极大的纵向力;非等跨简支梁桥对伸缩力和挠曲力影响较大,将使钢轨伸缩拉应力增大70%、钢轨挠曲应力增大50%、部分桥墩墩顶挠曲力增大50%;非等跨简支梁桥对制动力和地震力影响较小。
[Abstract]:In order to study the distribution law of longitudinal force of jointless track on non-equal-span simple supported beam bridge of heavy haul railway. The finite element model of the interaction between simply supported T beam and track of heavy load railway is established. The temperature is studied compared with that of 13-32 m simple supported beam bridge. The effects of vertical live load, train braking and seismic action on the system are discussed, and the influence of the non-equal-span simply supported beam (40 m) on the system is discussed. The results show that the system is subjected to various kinds of loads. The peak value of rail stress is mostly concentrated in the joint of simply supported beams and in the middle of span. Under the action of earthquake, the rail and the bottom of the pier bear great longitudinal force. The non-equal-span simply supported beam bridge has a great influence on the stretching force and flexural force, which will increase the tensile stress of rail by 70, the flexural stress of rail by 50, and the flexural force at the top of some piers by 50. Non-equal-span simply supported beam bridge has little effect on braking force and seismic force.
【作者单位】：中交第二公路勘察设计研究院有限公司;
【基金】：国家自然科学基金项目(51268016)
【分类号】：U441;U213.91
【正文快照】： 近年来,轴重30 t重载铁路已成为我国铁路建设的发展重点[1]。重载铁路桥梁的设计特点表现为轴重大、运量高,桥上广泛采用75 kg/m钢轨。我国学者已针对重载铁路的结构特点,研究了重载铁路的设计标准、结构形式、桥梁动力特征等[2-4],并对30 t重载铁路桥上无缝线路纵向力的分布

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