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Wind and Structures Volume 28, Number 3, March 2019 , pages 171-180 DOI: https://doi.org/10.12989/was.2019.28.3.171 |
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An iterative approach for time-domain flutter analysis of bridges based on restart technique |
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Wen-ming Zhang, Kai-rui Qian, Lian Xie and Yao-jun Ge
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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. | ||
| Key Words | ||
| long-span bridge; flutter; time domain; aeroelastic force; finite element (FE) model; ANSYS | ||
| Address | ||
| Wen-ming Zhang and Kai-rui Qian: Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 211189, P.R. China Lian Xie: T. Y. Lin International Engineering Consulting (China) Co., Ltd, Chongqing 401121, P.R. China Yao-jun Ge: State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, P.R. China | ||