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Comparison of numerical techniques for 3D flutter analysis of cable-stayed bridges |
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| Authors: | S H Cheng D T Lau M S Cheung |
| Affiliation: | a Department of Civil and Environmental Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, Ont., Canada K1S 5B6 b Department of Civil and Environmental Engineering, Ottawa-Carleton Bridge Research Institute, Carleton University, Ottawa, Ont., Canada K1S 5B6 |
| Abstract: | This paper presents the results of a comparison study of the numerical techniques of structural and aerodynamic force models developed based on the spline finite strip method with the conventional finite element approach in three-dimensional flutter analysis of cable-stayed bridges. In the new formulation, the bridge girder is modelled by spline finite strips. The mass and stiffness properties of the torsional behaviour of complex bridge girder, which have a significant influence on the wind stability of long-span bridges, are modelled accurately in the formulation. The effects of the spatial variation of the aerodynamic forces can be taken into account in the proposed numerical model by distributing the loads to the finite strips modelling the bridge deck. The numerical example of a 423 m long-span cable-stayed bridge is presented in the comparison study. The accuracy and effectiveness of the proposed finite strip model are compared to the results obtained from the equivalent beam finite element models. The advantages and disadvantages of these different modelling schemes are discussed. |
| Keywords: | Cable-stayed bridges Dynamics Finite element method Finite strip method Flutter analysis Aerodynamics Long-span structures Wind stability |
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