Aerodynamic Admittance Identification for Nonstreamline Section by Method of Zeroseparation

Abstract:

Buffeting response of a longspan bridge is an important part in the study of bridge vibration due to stochastic wind loads.Moreover,aerodynamic admittance functions are important parameters on buffeting force expression.At present,there is only an analytical expression for streamline section.The aerodynamic admittance for nonstreamline section is still on the exploration stage.This paper presents a zeroseparation method using the separated action of zero of steady state aerodynamic coefficient to orthogonal turbulence components to identify six aerodynamic admittances of the Scanlan’s modified buffeting force expression group by group.Six aerodynamic admittances are integral identified for the first time,which opens up a new way for aerodynamic admittance testing study.With the pressure measurement method,the stochastic buffeting force were measured with wind tunnel testing.

Key words:buffeting response; aerodynamic admittance; zeroseparation method; pressure measure; quasi flat section