Wind and Structures

Techno-Press (테크노프레스)
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Wind tunnel study of wind structure at a mountainous bridge location

  • Yan, Lei (Department of Bridge Engineering, Tongji University) ;
  • Guo, Zhen S. (Department of Bridge Engineering, Tongji University) ;
  • Zhu, Le D. (Department of Bridge Engineering, Tongji University) ;
  • Flay, Richard G.J. (Department of Mechanical Engineering, The University of Auckland)
  • Received : 2015.10.22
  • Accepted : 2016.06.18
  • Published : 2016.09.25
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Abstract

Wind tunnel tests of a 1/2200-scale mountainous terrain model have been carried out to investigate local wind characteristics at a bridge location in southeast Tibet, China. Flows at five key locations on the bridge at deck level were measured for 26 directions. It was observed that wind characteristics (including mean wind velocity and overall turbulence intensity) vary significantly depending on the approaching wind direction and measurement position. The wind inclination angle measured in the study fluctuated between $-18^{\circ}$ and $+16^{\circ}$ and the ratio of mean wind velocity to reference wind velocity was small when the wind inclination angles were large, especially for positive wind inclination angles. The design standard wind speed and the minimum critical wind speed for flutter rely on the wind inclination angle and should be determined from the results of such tests. The variation of wind speed with wind inclination angles should be of the asymmetry step type. The turbulence characteristics of the wind were found to be similar to real atmospheric flows.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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