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Wind and Structures
  Volume 30, Number 6, June 2020 , pages 649-662

Non-uniform wind environment in mountainous terrain and aerostatic stability of a bridge
Xingyu Chen, Junjie Guo, Haojun Tang, Yongle Li and Lei Wang

    The existence of a dam has potential effects on the surrounding wind environment especially when it is located in mountainous areas. In this situation, the long-span bridge over the reservoir can easily be exposed to non-uniform incoming flows, affecting its wind-resistance performance. This paper presents a study on the aerostatic stability of such a bridge. Wind tunnel tests were first carried out to investigate the wind environment above a mountainous reservoir. The results show that the angle of attack and the wind speed along the bridge axis show obvious non-uniform characteristics, which is related to the inflow direction. When winds come from the south where the river is winding, the angle of attack varies along the span direction significantly. The finite element model for the bridge was established using ANSYS software, and effects of non-uniform wind loads on the aerostatic stability were computed. Non-uniform angle of attack and wind speed are unfavorable to the aerostatic stability of the bridge, especially the former. When the combined action of non-uniform angle of attack and wind speed is considered, the critical wind speed of aerostatic instability is further reduced. Moreover, the aerostatic stability of the bridge is closely related to the dam height.
Key Words
    Aerostatic stability; wind characteristics; non-uniform inflow; dam; mountainous terrains; long-span bridge
Xingyu Chen, Junjie Guo, Haojun Tang, Yongle Li :Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China
Lei Wang:Broadvision Engineering Consultants, 650041 Kunming, China

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