漩涡脱落引起的悬索桥耦合颤振分析  

ANALYSIS OF COUPLED FLUTTERING OF SUSPENSION BRIDGE CAUSED BY VORTEX SHEDDING

作　　者：孙芳锦[1] 殷志祥[1] 张大明[2] 

机构地区：[1]辽宁工程技术大学土建学院,阜新123000 [2]辽宁工程技术大学技术与经济学院,阜新123000

出　　处：《钢结构》2008年第6期44-47,共4页Steel Construction

基　　金：辽宁省教育厅基金(202183391)

摘　　要：对由漩涡脱落引起的悬索桥耦合颤振进行分析。采用动网格,将流体、结构和动网格三者形成的耦合系统方程用任意拉格朗日-欧拉形式表示,并采用带有预测值的序列交错法求解该耦合系统。以塔科马大桥为例,采用弹簧类比方法建立动黏性流体网格,对由漩涡脱落引起的大桥耦合颤振进行分析,得到大桥发生扭转气弹失稳和弯曲气弹失稳的临界风速,找出大桥气弹失稳的规律,结果与试验结果符合良好。证明该方法对漩涡脱落引起的悬索桥耦合颤振分析的正确性和有效性。Coupled fluttering of suspension bridge caused by vortex shedding is analyzed. The three-field coupled system composed of fluid, solid and dynamic meshes are formulated in Arbitrary Lagrange Eulerian form. And conventional serial staggered procedure with predictor is adopted to solve the coupled system. Taking Tacoma Narrows Bridge for example, dynamic viscous fluid meshes established using a robust spring analogy method, the methodology is applied to the coupled fluttering analysis of the bridge deck. The critical wind speeds when the deck becomes aero elastically unstable in torsion and bending are predicted separately. And characteristics of aero elastic instability are found. The results obtained in this work agree well with the existing experimental results. The methodology presented here is proved to be accurate and stable in analyzing coupled fluttering of suspension bridge caused by vortex shedding.

关 键 词：悬索桥 漩涡脱落 耦合系统 序列交错法 颤振 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]