Flatternachweis von Brücken mittels Finiter Balkenelemente
Wind-induced flutter of bridges with streamlined, plate-like cross-section occurs as coupled torsional and vertical oscillation. Prediction can possibly be facilitated by representing the spatial system by a generalized 2-DOF system. This, however, may be unadmissible or extremely conservative if the modes of torsional and vertical vibration differ strongly. In this case, flutter prediction should be based on spatial modeling. Classical methods of aircraft engineering for solving the spatial problem proceed from partial differential equations of motion. For applications in bridge engineering, the finite-element concept proves more efficient. In this paper, two beam elements of differenct complexity are defined, and correspondend matrices are given. Formulation and solution of the resulting MDOF equations of motion is described. Results of a numerical study are presented and discussed.