大跨铁路斜拉桥模态特性研究

陈锐林;;曾庆元;黄云清;向俊;文颖;肖映雄;郭小刚;张俊彦

振动与冲击 ›› 2010, Vol. 29 ›› Issue (2) : 7-10.

PDF(1855 KB)
PDF(1855 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (2) : 7-10.
论文

大跨铁路斜拉桥模态特性研究

  • 陈锐林1,2,3 ,曾庆元3,黄云清2,向俊3,文颖3,肖映雄1,郭小刚1,张俊彦1

作者信息 +

Study on the characteristic of large span railway cable-stayed bridge mode

  • Chen Rui-lin1,2,3 , Zeng Qin-yuan3, huang yun-qing2,xiangjun3,weng ying3,xiao yingxiong
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摘要

建立了大跨铁路斜拉桥的三维有限元整桥模型。利用子空间迭代法求解无阻尼自由振动的特征方程。分析计算了整桥频率和有车频率及其振型的变化趋势,模拟计算结果显示各阶有车整桥频率低于相应的无车整桥频率,并且振型也由整桥无车时,垂直面与水平面两个独立平面的振动,演变成有车时,竖向挠曲与横向弯扭的空间藕合,本文亦研究了不同停车位置和不同列车长度对斜拉桥的自振频率的影响,随着停车位置的变化,有车整桥频率发生波动,列车进桥、出桥时,整桥频率分别单调下降、上升;列车停于桥中和桥塔处,整桥频率出现驻值点,随着拖车数目的变化,有车整桥频率亦发生变化,一般趋势是:随着拖车数目的增加各阶有车整桥频率将会降低,而其变化趋势不受拖车数目影响。
关键词:铁路斜拉桥;有限元法;自振频率;振型

Abstract

A 3D finite elements model of the whole bridge has been built up,The characteristic equation of free vibration was solved with subspace iterative method.The changing trend of frequencies and vibration modes of the whole bridge without or with train is computed and analysed.The results of simulation and calculation show every order natural frequencies of the whole bridge with train is lower than the corresponding one of natural frequencies of the whole bridge without train .moreover, Vibration modes evolve spatial coupled modes of vertical bend and coupled mode of lateral bend and torsion from vibration in independence plane including vertical and horizontal. The study includes the influences on natural frequency of cable-stayed bridge in different parking position and diffenert length of train.as a result of bridge tower, With the change of parking positions,natural frequencies of the whole bridge with train fluctuate.when train enters or leaves the bridge , natural frequencies of the whole bridge monotonously drop or rise separately ; when train stops in the middle of bridge or near bridge tower, natural frequencies of the whole bridge have extremum With variety of the number of trailing vehicles. natural frequencies of the whole bridge change too . It is the common rules that natural frequencies of the whole bridge shall reduce while the number of trailing vehicles increase . however, the changing trend of natural frequencies isn’t influenced by the number of trailing vehicles .

关键词

铁路斜拉桥 / 有限元法 / 自振频率 / 振型

Key words

railway cable-stayed bridge / FEM / free vibration frequency / vibration mode

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导出引用
陈锐林;;曾庆元;黄云清;向俊;文颖;肖映雄;郭小刚;张俊彦. 大跨铁路斜拉桥模态特性研究[J]. 振动与冲击, 2010, 29(2): 7-10
Chen Rui-lin;;Zeng Qin-yuan;huang yun-qing;xiangjun;weng ying;xiao yingxiong. Study on the characteristic of large span railway cable-stayed bridge mode[J]. Journal of Vibration and Shock, 2010, 29(2): 7-10

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