Wind and Structures

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An iterative approach for time-domain flutter analysis of bridges based on restart technique

  • Zhang, Wen-ming (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Qian, Kai-rui (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Xie, Lian (T. Y. Lin International Engineering Consulting (China) Co., Ltd) ;
  • Ge, Yao-jun (State Key Lab for Disaster Reduction in Civil Engineering, Tongji University)
  • Received : 2018.03.07
  • Accepted : 2018.09.07
  • Published : 2019.03.25
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Abstract

This paper presents a restart iterative approach for time-domain flutter analysis of long-span bridges using the commercial FE package ANSYS. This approach utilizes the recursive formats of impulse-response-function expressions for bridge's aeroelastic forces. Nonlinear dynamic equilibrium equations are iteratively solved by using the restart technique in ANSYS, which enable the equilibrium state of system to get back to last moment absolutely during iterations. The condition for the onset of flutter instability becomes that, at a certain wind velocity, the amplitude of vibration is invariant with time. A long-span suspension bridge was taken as a numerical example to verify the applicability and accuracy of the proposed method by comparing calculated results with wind tunnel tests. The proposed method enables the bridge designers and engineering practitioners to carry out time-domain flutter analysis of bridges in commercial FE package ANSYS.

Keywords

Acknowledgement

Supported by : National Science Foundation of China, Natural Science Foundation of Jiangsu Province

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