摘要
为研究600 km/h高速磁浮简支箱梁桥方案的车致动力行为,基于柔性体动力学方法,建立并验证了磁浮列车通过桥梁的桥梁动力分析模型。以跨度30.96 m高速磁浮简支箱梁桥为研究对象,进行不同梁高的桥梁动力特性对比,分析不同梁高和车速对高速磁浮桥梁动力响应的影响。结果表明:所建立移动荷载过桥动力分析方法能较好地反映磁浮列车通过桥梁时的桥梁动力响应。针对2.8,3.0,3.2 m三种梁高,速度分别为200~480,200~500 km/h和200~540 km/h时,桥梁竖向位移随速度变化的幅度较小,当速度分别超过480,500 km/h和540 km/h时,桥梁竖向位移急剧增大。2.8 m梁高的桥梁动力系数最大为1.319。桥梁竖向加速度随速度变化出现3个极值点,320~360 km/h速度对应的桥梁竖向加速度最大,2.8 m梁高对应的加速度为4.040 m/s^2。
In order to study the dynamic performances of 600 km/h high-speed maglev simply-supported box girder bridge under vehicle loads, the bridge dynamic analysis model of maglev vehicle passing bridges is established and verified based on the flexible body dynamics method. A 30.96 m high-speed maglev simply-supported box girder bridge is taken as the research project, the dynamic characteristics of bridges with different girder heights are compared, and the effects of different girder heights and vehicle operating speeds on the dynamic responses of the high-speed maglev bridge are analyzed. The results show that the established dynamic analysis method of moving loads through bridge could reflect the dynamic responses of the bridge when the maglev train passes through the bridge. For the girder height of 2.8 m, 3.0 m and 3.2 m, when the speed is 200~480 km/h, 200~500 km/h and 200~540 km/h respectively, the vertical displacement of the bridge changes less with the change of the speed. When the speed exceeds 480 km/h, 500 km/h and 540 km/h respectively, the vertical displacement of the bridge increases sharply. The maximum dynamic coefficient of the bridge with 2.8 m girder height is 1.319. There are three extreme points of the vertical acceleration of the bridge in response to the change of speed. The vertical acceleration of the bridge is the largest corresponding to the speed of 320~360 km/h, and the acceleration corresponding to the 2.8 m girder height is 4.040 m/s^2.
作者
徐昕宇
杨国静
陈星宇
郑晓龙
XU Xinyu;YANG Guojing;CHEN Xingyu;ZHENG Xiaolong(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2020年第10期57-61,共5页
Railway Standard Design
基金
国家重点研发计划项目(2016YFB1200602-38)。
关键词
高速磁浮
简支箱梁
动力响应
柔性体动力学
车速
动力系数
high-speed maglev
simply-supported box girder
dynamic responses
flexible body dynamics
vehicle speed
dynamic coefficient
