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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 (辛大波)1 and Ou Jinping (欧进萍)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−ε 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

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Copyright 2009 IEM. Journal of Earthquake Engineering and Engineering Vibration. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as described below, without written permission from the Publisher. Copying of articles is not permitted except for personal and internal use, to the extent permitted by national copyright law, or under the terms of a license issued by the National Reproduction Rights Organization of China.