Wind characteristics of a bridge site and wind-resistance key technology in complex mountains

The random variability of mountainous area terrain and the mutual aerodynamic interference between different terrain features make the wind field in bridge sites extremely complicated, which results in considerable challenges to the wind resistance of large-span bridges. In this study, the wind characteristics of a bridge site in a typical mountainous area were determined by field measurements. The design reference wind speed was derived from historical statistics, numerical wind tunnel simulations, field measurements, etc. According to the wind characteristics of the mountainous area, the flutter performances of a bridge under non-uniform and non-stationary inflow were analyzed, and the effects of common aerodynamic measures on flutter stability were analyzed at large angles of attack. The results showed that the integrated wind speed standard in complex mountainous terrains can derived in various ways, which is significantly different from a conventional plain area. The non-uniform, large angle of attack, and non-stationary inflow has a significant impact on the flutter performance of a bridge.