Abstract
The validity of wind tunnel procedure with sectional models used to investigate the aerodynamic stability of long-span bridges was examined by several wind tunnel tests. The vortex induced bending oscillations of some rectangular cylinders were discussed comparing the bending amplitudes, aerodynamic forces, surrounding flow patterns and unsteady pressure distributions of the sectional models with those of the taut strip models. After that, it becomes clear that there is a significant difference between the responses of 2D and 3D models for the reason of the non-linear dependence of unsteady aerodynamic force on amplitude and the existence of spanwise flow.
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