Wind Induced Vibration of Braces Adjacent to a High Circular Stack

When a strong wind blows a high circular stack, the braces located around the stack vibrated violently. The vibration was induced by winds whose directions are in some particular range. Assuming the flow is potential, fluid dynamic forces acting on a brace are obtained. Dynamic behavior of the brace is analyzed. Analytical results show that the brace vibration may be unstable due to cross coupling spring terms related to fluid dynamics forces. They also agree weH with the observed phenomena