The Association Study Of The Static Aerodynamic Coefficient And The Flutter Stability

The existing research apply static aerodynamic coefficient not only to judging static stability but also judging galloping stability, calculating buffeting response and estimating displacement amplitude of the vortex-excited resonance. but there is few study on the relationship between static aerodynamic coefficient and flutter stability. This paper will draw a conclusion about the relationship between static aerodynamic coefficient and flutter stability via the analysis of the experimental data based on three typical section:all closed-steel box girder section, central-slotted box girder section, truss section.Applying the relationship of the static aerodynamic coefficient and the flutter derivatives, we can associate the static aerodynamic coefficient with flutter stability using the flutter derivatives as an intermediary agent. i.e. using the air damping of the system calculated by static aerodynamic coefficient we can analysis the flutter stability. Thus we relate the static aerodynamic coefficient to the flutter stability, then we use flutter mechanism to illustrate the reason of this relationship. different girder section have the different flutter mechanism, so we should discuss these working conditions that have the same flutter mechanism when we study the relationship between static aerodynamic coefficient and flutter stability. This text only study the working condition that have the twisting motion.The text reach a conclusion about the relationship of the static aerodynamic coefficient and the flutter stability among the three typical girder section which have same flutter mechanism. In order to illustrate this conclusion for further steps we also compare other bridges that have larger span in foreign countries.