特征紊流对桥梁断面抖振力贡献的力谱移植法

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (13) : 306-314.

论文

特征紊流对桥梁断面抖振力贡献的力谱移植法

周豪威，张志田

作者信息 +

Force spectrum transplanting method for contribution of signature turbulence to bridge section buffeting force

ZHOU Haowei, ZHANG Zhitian

Author information +

文章历史 +

摘要

为研究特征紊流对钝体断面抖振力的贡献，以双边肋桥梁断面为例，基于CFD数值模拟计算了均匀流场以及四种不同紊流场中的气动力，研究了不同风场条件下特征紊流对气动力的影响。提出特征紊流气动力谱移植法，得到考虑特征紊流影响的准定常理论气动升力谱。在此基础上，以节段模型为例对比研究了特征紊流对抖振响应的贡献。结果表明，特征紊流会使得气动力谱呈现出不同影响程度的波峰，造成的抖振响应高于准定常理论值；随着风场中紊流度的增大，特征紊流效应逐步减弱直至最后消失。

Abstract

In order to study the contribution of signature turbulence to buffeting force on blunt body sections, taking the double-girder bridge section as an example, aerodynamic force of a double-girder section is investigated by computational fluid dynamics (CFD) simulation. Five types of oncoming flow fields, a smooth and 4 turbulent ones, are considered to investigate their effects on significance turbulence induced aerodynamic loads. An aerodynamic spectrum transfer method is put forward to consider the effects of signature turbulence, and hence obtain the adapted quasi-steady aerodynamic load spectrum including the signature turbulence effects. Based on this and taking a sectional model as an example, the effects of signature turbulence on buffeting responses are studied. The results reveal that, the signature turbulence adds peaks to the load spectra, resulting in higher buffeting responses than those from the quasi-steady theory. As the turbulent intensity increases, the effects of signature turbulence attenuate progressively and finally disappear completely.

导出引用

周豪威, 张志田. 特征紊流对桥梁断面抖振力贡献的力谱移植法[J]. 振动与冲击, 2024, 43(13): 306-314

ZHOU Haowei, ZHANG Zhitian. Force spectrum transplanting method for contribution of signature turbulence to bridge section buffeting force[J]. Journal of Vibration and Shock, 2024, 43(13): 306-314

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