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Numerical simulation of aerodynamic derivatives and critical wind speed for long-span bridges based on simplified steady wind field

Xin Dabo (ÐÁ´ó²¨)¹ and Ou Jinping (Å·½øƼ)^1,2

1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
2. Dalian University of Technology, Dalian, 116024, China

Abstract: Combining the computational fluid dynamics-based numerical simulation with the forced vibration technique for extraction of aerodynamic derivatives, an approach for calculating the aerodynamic derivatives and the critical flutter wind speed for long-span bridges is presented in this paper. The RNG k−¦Å turbulent model is introduced to establish the governing equations, including the continuity equation and the Navier-Stokes equations, for solving the wind flow field around a two-dimensional bridge section. To illustrate the effectiveness and accuracy of the proposed approach, a simple application to the Hume Bridge in China is provided, and the numerical results show that the aerodynamic derivatives and the critical flutter wind speed obtained agree well with the wind tunnel test results.

Keywords: aerodynamic derivatives; critical flutter wind speed; numerical simulation; wind tunnel test; long-span bridges