| 摘要: |
| 利用计算流体动力学(CFD)方法对泰州大桥中塔沉井进行数值分析,研究了不同流速条件下水流力引起的振动周期及振幅.研究表明,由于流体在沉井后侧发生交替的涡泄,引发了纵向的定常力和振荡力,以及垂直来流方向上的激振力,这两者的倍频关系决定了摆振的形态.在3.5×107≤Re<8.1×107时,升力周期出现较大变化,在此范围内施工,需加强锚缆力,防止沉井摆振. |
| 关键词: 沉井 数值模拟 振动特性 泰州大桥 |
| DOI： |
| 分类号:U443.13+1 |
| 基金项目:国家科技支撑计划资助项目，交通运输部2008年度部省联合攻关项目 |
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| Numerical simulation of vibration for Taizhou Bridge middle tower caisson |
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CHEN Ce
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CHEN Ce1,2(1.Civil and Transportation College,Hohai University,Nanjing 210098,China;2.Jiangsu Provincial Yangtze Highway Bridge Construction Commanding Department,Taizhou 225321,China)
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| Abstract: |
| Computational fluid dynamics(CFD) numerical simulation is employed on the middle tower caisson of Taizhou Bridge,analyzing its flow-force-induced vibration amplitude and cycle in different flow conditions.The vortex in the back of the caisson causes the vertical constant force and oscillation force and exciting force perpendicular to the flow direction.The volume of two kinds of forces decides the form of the vibration.A larger lift cycle amplitude change appears when 3.5×107≤Re<8.1×107.If the caisson is sinking in this Re scope,the anchor cable should be strengthened to prevent shimmy. |
| Key words: open caisson numerical simulation vibration characteristics Taizhou Bridge |
