辅助墩对大跨度铁路悬索桥抗震性能及列车走行性的影响

发布时间：2018-01-10 20:24

本文关键词：辅助墩对大跨度铁路悬索桥抗震性能及列车走行性的影响　出处：《建筑科学与工程学报》2014年03期 　论文类型：期刊论文

【摘要】：为研究辅助墩对铁路悬索桥抗震性能及列车走行性的影响,以主跨828m的某单线铁路悬索桥方案为工程背景,建立了有限元模型,采用反应谱法和时程分析法对比研究了辅助墩对铁路悬索桥地震响应的影响。通过车-桥耦合振动分析,比较了不同位置辅助墩对桥梁和列车动态响应的影响。结果表明:设置辅助墩后,加劲梁的竖向地震反应明显减小,而桥塔的地震响应增大;车辆通过桥梁时,设置辅助墩后梁端竖向转角、车辆竖向加速度和轮重减载率均减小;当辅助墩位置向梁端移动时,梁端竖向转角、车辆竖向加速度及轮重减载率均逐渐减小,车辆响应对辅助墩纵向位置的变化不敏感。
[Abstract]:In order to study the influence of auxiliary piers on the seismic performance and train running behavior of railway suspension bridge, a finite element model is established based on a single track suspension bridge project with main span of 828m. The effect of auxiliary piers on the seismic response of railway suspension bridges is studied by means of response spectrum method and time-history analysis method, and the vehicle-bridge coupling vibration analysis is carried out. The effects of auxiliary piers in different positions on the dynamic response of bridges and trains are compared. The results show that the vertical seismic response of stiffened beams decreases obviously and the seismic response of bridge towers increases after setting auxiliary piers. When the vehicle passes through the bridge, the vertical rotation angle of the rear beam of the auxiliary pier is set, the vertical acceleration of the vehicle and the load reduction rate of the wheel are both reduced. When the position of the auxiliary pier moves to the beam end, the vertical turning angle of the beam end, the vertical acceleration of the vehicle and the load reduction rate of the wheel gradually decrease, and the vehicle response is not sensitive to the change of the longitudinal position of the auxiliary pier.
【作者单位】：西南交通大学土木工程学院;中国中铁二院工程集团有限责任公司;
【基金】：“十二五”国家科技支撑计划项目(2012BAG05B02) 国家自然科学基金项目(U1334201)
【分类号】：U448.25
【正文快照】： 0引言悬索桥作为重要的大跨度桥梁结构类型,以其卓越的跨越能力、简洁明确的受力特点被广泛应用于公路桥梁领域[1]。但是悬索桥是柔性结构,其刚度较弱,在列车荷载、地震荷载等因素作用下容易产生较大位移,降低了列车运行的安全性,因此各国铁路悬索桥的修建并不多见[2-3]。对于

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