Effect of Strong Typhoon on Windinduced Performance of LongSpan Steel Truss Arched Bridge

Abstract:

Based on the MonteCarlo typhoon simulation results of typhoon field characteristics and the wind parameters of normal climate field from wind loading Codes, both the typhoon and the normal climate field are simulated in the atmospheric boundary layer wind tunnel by the passive turbulence generators. Taken as an example, wind resistant performance of Guangzhou Xinguang Bridge,a longspan arched bridge located in the south Mainland China, is compared under the above two climate modes based on the full aeroelastic model wind tunnel testing and the threedimensional numerical algorithm of static wind displacement and its stability with the help of static aerodynamic force coefficients of sectional model of the main girder and the arc rib in midspan. In the process of analysis, more emphases are focused on the effects of design wind speeds of return period, vertical profiles about average wind velocity and turbulence intensity on arc bridge windresistant performance.

Key words:steel truss arched bridge; normal climate; typhoon climate; windresistant performance; wind tunnel test