Study on the Effects of Structural Deformation on Flutter of Long-span Suspension Bridge

Long-span suspension bridge is most susceptive to wind action, and will be deformed significantly under the wind loading, which leads to the nonlinear variations of structural dynamic characteristics and the aeroelastic forces acting on the bridges.The flutter behaviors of long-span suspension bridges will be influenced remarkably by the nonlinear effects of structural deformation. Based on the deformed bridge structures, an approach of three-dimensional nonlinear flutter analysis is firstly presented, in which the nonlinear effects of structural deformation are fully considered.Numerical flutter analyses are then performed of a long-span suspension bridge.Finally, the role and mechanism of the nonlinear effects of structural deformation in the flutter behaviors of long-span suspension bridge are clarified.