Host: Japan Association for Wind Engineering
Pages 191-192
Wake galloping and wake-induced flutter appear in such parallel circular cylinder structures such as cables which are stayed long-span bridges. The research on these aerodynamic instabilities have been done so far, however, the mechanism of that has not perfectly been revealed. Here we show the relationships between the arrangement of 2 cylinders and mechanisms and between the reduced wind velocity and mechanisms of these aerodynamic instabilities gained from forced vibration tests and 2 DOF flutter analysis. It is revealed that the mechanisms of aerodynamic vibrations depending on a slight difference in the arrangement of 2 cylinders. Moreover, It is found that due to the change of the value of the unsteady aerodynamic derivative H1* as the reduced wind velocity changes, there is an arrangement in which vibration of different mechanisms of aerodynamic vibrations occurs.
