To establish dynamic FEM model of cable-stayed bridge with double-ribs girder, the dynamic stiffness distribution rules and methods of 'three main girders' model are studied, which relate to flexural rigidity, shearing rigidity, free torsion rigidity and restricted torsion rigidity. Based on the former work, dynamic FEM analysis is made on the dynamic properties of the longest-span concrete cable-stayed bridge in Asia with geometric nonlinear effects considered. On the base of modal test of cable-stayed bridge, applying two points method under ambient excitation, a method to identify modal par...
