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Engineering    2017, Vol. 3 Issue (6) : 823 -838
Research |
A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges
Igor Kavrakov1(),Guido Morgenthal2
1. Research Training Group 1462, Bauhaus-University Weimar, Weimar 99423, Germany
2. Chair of Modeling and Simulation of Structures, Bauhaus-University Weimar, Weimar 99423, Germany

Wind-induced vibrations commonly represent the leading criterion in the design of long-span bridges. The aerodynamic forces in bridge aerodynamics are mainly based on the quasi-steady and linear unsteady theory. This paper aims to investigate different formulations of self-excited and buffeting forces in the time domain by comparing the dynamic response of a multi-span cable-stayed bridge during the critical erection condition. The bridge is selected to represent a typical reference object with a bluff concrete box girder for large river crossings. The models are viewed from a perspective of model complexity, comparing the influence of the aerodynamic properties implied in the aerodynamic models, such as aerodynamic damping and stiffness, fluid memory in the buffeting and self-excited forces, aerodynamic nonlinearity, and aerodynamic coupling on the bridge response. The selected models are studied for a windspeed range that is typical for the construction stage for two levels of turbulence intensity. Furthermore, a simplified method for the computation of buffeting forces including the aerodynamic admittance is presented, in which rational approximation is avoided. The critical flutter velocities are also compared for the selected models under laminar flow.

Keywords Buffeting      Flutter      Long-span bridges      Bridge aerodynamics      Bridge aeroelasticity      Erection stage     
Corresponding Authors: Igor Kavrakov   
Just Accepted Date: 13 December 2017   Issue Date: 02 March 2018
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Igor Kavrakov
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Igor Kavrakov,Guido Morgenthal. A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges[J]. Engineering, 2017, 3(6): 823 -838 .
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