Flutter Stability Studies of Long Span Bridge with Active Control Wing Plate by CFD Numerical Simulation

摘要

Long span suspension bridges, due to their flexibility and lightness, are much prone to flutterrninstability. A relatively new research area on aerodynamic stability for very long span bridges isrnbased on actively controlled flaps attached along the girders. Different from previous research, thisrnpaper proposes a new method to study the question. By secondary development of commercialrncomputational fluid dynamics software FLUENT, the paper establishes two-dimensional bendingrnand torsional fluid-structure interaction numerical model to study flutter stability of a long spanrnsuspension bridges with active control wing plate which is located beneath the deck. The paperrnstudy the flutter stability by controlling the rotational velocity of the wing plates with respect to thatrnof the bridge deck. Numerical results show: The flutter critical wind speed of girder without wingrnplate is agreement with wind tunnel test. It is an optimal control law that the leading surface rotatesrnin the opposite direction and the trailing surface rotates in the same direction with respect to therndeck motion. The maximum torsional displacement amplitude decrease when increasing thernrotational velocity of the winglet with respect to that of the deck.