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Wind Field Measurements and Wind-induced Vibration Responses of Transmission Tower During Typhoon Wipha(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2009年02期
Page:
1-8
Research Field:
Publishing date:
2009-06-20

Info

Title:
Wind Field Measurements and Wind-induced Vibration Responses of Transmission Tower During Typhoon Wipha
Author(s):
LI Jie12 YAN Qi1 XIE Qiang12 CHEN Jun12
1. Department of Building Engineering, Tongji University, Shanghai 200092, China; 2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University,Shanghai 200092, China
Keywords:
typhoon Wipha field measurement homogeneousness of wind field transmission tower damping ratio dynamic characteristic
PACS:
TU311.3
DOI:
-
Abstract:
The multi-points field measurement results of boundary layer wind characteristics over typical country terrain and wind-induced response of transmission tower during the passage of typhoon Wipha were presented. Detailed analyses of the wind speed were conducted to investigate the spatial homogeneousness of wind field during windstorms. The measured wind data were analyzed to compare the information on mean wind speed and wind direction, wind profile parameters, turbulence intensity, gust factor, turbulence integral length scale and spectra of fluctuating wind, vertical decay factor and horizontal coherence. Besides the wind speed, lateral wind-induced acceleration responses at the middle and the top of the 43-meters high transmission tower were measured. Based on the field measurements, the natural vibration frequencies and damping ratios of the first two lateral vibration modes were identified by Hilbert-Huang transform(HHT). The results show that identified results of natural vibration frequencies are well matched with those of finite element method calculation, and identified results of damping ratios are more greater than that those of general steel structures.

References:

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Memo:
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Last Update: 2009-06-20