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Wind and Structures
  Volume 29, Number 4, October 2019 , pages 279-297
DOI: https://doi.org/10.12989/was.2019.29.4.279
 


Driving safety analysis of various types of vehicles on long-span bridges in crosswinds considering aerodynamic interference
Yan Han, Jingwen Huang, C.S. Cai, Suren Chen and Xuhui He

 
Abstract
    Strong winds threaten the safety of vehicles on long-span bridges considerably, which could force traffic authorities to reduce speed limits or even close these bridges to traffic. In order to maintain the safe and economic operation of a bridge, a reasonable evaluation of the driving safety on that bridge is needed. This paper aims at carrying outdriving safety analyses for three types of vehicles on a long-span bridge in crosswinds by considering the aerodynamic interference between the bridge and the vehicles based on the wind-vehicle-bridge coupling vibration analysis. Firstly, CFD numerical simulations along with previously obtained wind tunnel testing results were used to determine the aerodynamic force coefficients of the three types of vehicles on the bridge. Secondly, the dynamic responses of the bridge and the vehicles under crosswinds were simulated, and based on those, the driving safety analyses for the three types of vehicles on the bridge were carried out for both cases considering and not considering the aerodynamic interference between the vehicles and the bridge. Finally, the effect of the aerodynamic interference on the safety of the vehicles was investigated. The results show that the aerodynamic interference between the bridge and the vehicles not only affects the accident critical wind speed but also the accident type for all three types of vehicles. Such effects are also different for each of the three types of vehicles being studied.
 
Key Words
    long-span bridges; driving safety analyses; crosswinds; aerodynamic interference; accident critical wind speed
 
Address
Yan Han and Jingwen Huang: School of Civil Engineering, Changsha University of Science & Technology, Changsha, China, 410004
C.S. Cai: Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
Suren Chen: Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80523, USA
Xuhui He: School of Civil Engineering, Central South University, Changsha, China, 410075
 

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