大跨钢桁拱桥局部杆件动力特性及涡振发生风速的影响因素研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (6) : 174-181.

论文

遆子龙, 李永乐, 徐昕宇

作者信息 +

Influencing factors of dynamic characteristics and onset wind speed of the vortex induced vibration of local members in a long span steel truss arch bridge

TI Zilong,LI Yongle,XU Xinyu

Author information +

文章历史 +

摘要

大跨钢桁拱桥的部分杆件较为细长，对风的作用较为敏感。为考察大跨钢桁拱桥中局部杆件的涡振发生风速，以沿海某大跨度钢桁拱桥为工程背景，基于有限元和计算流体动力学的方法，研究了典型细长杆件在全桥约束下的自振频率、截面气动特性与涡振发生风速。基于有限元方法，提出考虑了全桥约束、结构内力及节点板长度的大跨度钢桁拱桥“零密度”建模方法，对局部杆件的自振频率进行求解。基于计算流体动力学方法，对杆件截面的气动参数进行了计算，并对杆件涡振发生风速进行了分析与讨论。研究表明，使用“零密度”法建模能合理反应局部杆件在全桥约束下的动力特性，杆件约束条件、结构内力、节点板长度均会对自振频率和涡振发生风速产生明显影响，以往使用杆端固结等简单约束条件可能偏危险地高估了涡振发生风速。

Abstract

In longspan steel truss arch bridges, some of the slender local members are sensitive to wind forces. In order to investigate the onset wind speed of the vortexinduced vibration of local members in longspan steel truss arch bridges, a longspan steel truss bridge built in the coastal region was regarded as an engineering example. Based on the finite element method (FEM), a modelling approach called “zerodensity”, considering the stiffness of the entire bridge, the structural internal force and the length of gusset plates, was proposed to calculate the natural frequency of the local members. Based on the method of computational fluid dynamics (CFD), the aerodynamic characteristics of the sections of the local members were calculated and the lockin wind speed of vortexinduced vibration of the local members were analyzed and discussed. It is shown that using the “zerodensity” approach gives reasonable results of the dynamic characteristics of local members. The boundary conditions, structural internal force and length of gusset plates have notable influences on the natural frequency and lockin wind speed of the local members and using rigid boundary conditions in previous studies may overestimate the lockin wind speed, which may cause unsecurity.

导出引用

遆子龙, 李永乐, 徐昕宇. 大跨钢桁拱桥局部杆件动力特性及涡振发生风速的影响因素研究[J]. 振动与冲击, 2018, 37(6): 174-181

TI Zilong,LI Yongle,XU Xinyu. Influencing factors of dynamic characteristics and onset wind speed of the vortex induced vibration of local members in a long span steel truss arch bridge[J]. Journal of Vibration and Shock, 2018, 37(6): 174-181

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