Galloping critical conditions on yawed square cylinders

This paper concerns the study of galloping critical conditions on square cylinders having an arbitrary attitude in the wind flow. It is based on a consistent theoretical model of wind actions which permits the analysis of a generic-shaped cross-section. The availability of specific experimental data allows a sound definition of aerodynamic actions. The analysis of critical conditions can be performed in closed form in the plane of the aerodynamic damping matrix invariants. Preliminary results concerning laminar wind flow point out that yaw effects can influence critical conditions, leading to values of critical velocities that can also be remarkably different from those in classical crossflow conditions.