MULTI-MODE FLUTTER ANALYSIS AND TWO & THREE DIMENSIONAL MODEL TESTS ON BRIDGES WITH NON-ANALOGOUS MODAL SHAPES

Coupled flutter of non-analogous vertical and torsional modes, which may typically occur in mono-cable suspension or single plane cable-stayed bridges, for example, and multimode flutter including higher modes are studied both analytically and experimentally. In such cases, the lateral locations of rotational center of girder vary along the span, so that a two-dimensional or spring mounted model test loses its validity. The proposed multi-mode flutter analysis using the flutter derivatives is expected to be useful to predict the coupled non-analogous and/or multi-mode flutter along with the three-dimensional model tests.