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Wind and Structures
  Volume 24, Number 4, April 2017 , pages 367-384
DOI: https://doi.org/10.12989/was.2017.24.4.367
 


Wind tunnel investigation on flutter and buffeting of a threetower suspension bridge
Wen-ming Zhang and Yao-jun Ge

 
Abstract
    The Maanshan Bridge over Yangtze River in China is a new long-span suspension bridge with double main spans of 2x1080 m and a closed streamline cross-section of single box deck. The flutter and buffeting performances were investigated via wind tunnel tests of a full bridge aeroelastic model at a geometric scale of 1:211. The tests were conducted in both smooth wind and simulated boundary layer wind fields. Emphasis is placed on studying the interference effect of adjacent span via installing a wind deflector and a wind separating board to shelter one span of the bridge model from incoming flow. Issues related to effects of mid-tower stiffness and deck supporting conditions are also discussed. The testing results show that flutter critical wind velocities in smooth flow, with a wind deflector, are remarkably lower than those without. In turbulent wind, torsional and vertical standard deviations for the deck responses at midspan in testing cases without wind deflector are generally less than those at the midspan exposed to wind in testing cases with wind deflector, respectively. When double main spans are exposed to turbulent wind, the existence of either span is a mass damper to the other. Furthermore, both effects of mid-tower stiffness and deck supporting conditions at the middle tower on the flutter and buffeting performances of the Maanshan Bridge are unremarkable.
 
Key Words
    suspension bridge; double main spans; flutter; buffeting; wind tunnel test; full bridge aeroelastic model
 
Address
Wen-ming Zhang: Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, 2 Sipailou Road, Nanjing 210096, China

Yao-jun Ge: State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
 

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