Influence of aerodynamic force matrix and aerodynamic derivatives on flutter stability for bridge

Two forms of aerodynamic force matrix, ie the lumped aerodynamic force matrix and the consistent aerodynamic force matrix were presented. The influence of aerodynamic force matrix on critical flutter state with aerodynamic derivatives of four different sections was studied. The influence of each aerodynamic derivative on critical flutter state using aerodynamic derivative of idealized zero-height plate was also studied. Results show that lumped aerodynamic force matrix can be used to decrease critical flutter speed and make it conservative; aerodynamic derivatives have influence on dimensionless wind speed and critical flutter speed to a certain extent, but have a little influence on flutter frequency. It approves that the streamline-deck bridge is prone to classical or binary flutter forming from the coalescence of bending and torsional modes.