结构振动对风特性测试结果的影响研究

程怀宇 王浩 肖士者 郭彤 邓稳平

振动与冲击 ›› 2014, Vol. 33 ›› Issue (15) : 49-53.

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PDF(1748 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (15) : 49-53.
论文

结构振动对风特性测试结果的影响研究

  • 程怀宇 王浩 肖士者 郭彤 邓稳平
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Study on the Influence of Structural Vibration on Measured Results of Wind Characteristics

  • Cheng Huaiyu, Wang Hao, Xiao Shizhe, Guo Tong, Deng Wenping
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摘要

现场实测是获得结构所在地风特性的主要途径,因而实测数据的准确性至关重要。为了开展风特性精细化研究,本文重点分析了结构振动对所测数据的影响。通过实验测出相同风场内考虑和不考虑风速仪基底振动的风特性时程数据,分析对比了不同工况下获得的平均风速、紊流强度、紊流积分尺度及功率谱密度,其中基底分别输入了“韦帕”台风作用下润扬大桥主梁跨中横向振动和白噪声。结果表明,在基底输入主梁振动信号时,基底振动对实测平均风速以及紊流特性的影响程度均很小,但会导致实测紊流强度和顺风向功率谱密度略高于真实值。结论可为结构风场测试及数据分析提供参考。

Abstract

Field measurement is the main way to obtain the wind characteristics of structure site, thus the accuracy of measured data is very important. In order to conduct refinement researches on wind characteristics, the influence of structural vibration on wind characteristics was analyzed specifically in this paper. The time-history wind data in the same wind field are measured with and without anemometer-base vibration. The wind characteristics including the mean wind speed, turbulence intensity, turbulence integral scale and power spectral density under different cases are analyzed and compared. In this experiment, the measured lateral vibration of the deck of Runyang Bridge during typhoon Wipha and the white noise are employed as the anemometer-base signal inputs. Results show that structural vibration has little influence on the measured mean wind speed and turbulent wind characteristics when the measured lateral vibration of the deck is input. However, it may cause the turbulence intensity and power spectral density in along-wind direction slightly larger than the corresponding true value. Conclusions can provide reference for wind field measurement and data analysis of engineering structures.


关键词

结构振动 / 风特性 / 平均风速 / 紊流强度 / 紊流积分尺度 / 风速功率谱密度

Key words

structural vibration / wind characteristic / mean wind speed / turbulence intensity / turbulence integral scale / wind speed power spectral density

引用本文

导出引用
程怀宇 王浩 肖士者 郭彤 邓稳平. 结构振动对风特性测试结果的影响研究[J]. 振动与冲击, 2014, 33(15): 49-53
Cheng Huaiyu;Wang Hao;Xiao Shizhe;Guo Tong;Deng Wenping. Study on the Influence of Structural Vibration on Measured Results of Wind Characteristics[J]. Journal of Vibration and Shock, 2014, 33(15): 49-53

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