Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Wind and Structures Volume 10, Number 1, January 2007 , pages 61-82 DOI: https://doi.org/10.12989/was.2007.10.1.061 |
|
|
|
Flutter analysis of long-span bridges using ANSYS |
||
X. G. Hua, Z. Q. Chen, Y. Q. Ni and J. M. Ko
|
||
| Abstract | ||
| This paper presents a novel finite element (FE) model for analyzing coupled flutter of long-span bridges using the commercial FE package ANSYS. This model utilizes a specific user-defined element Matrix27 in ANSYS to model the aeroelastic forces acting on the bridge, wherein the stiffness and damping matrices are expressed in terms of the reduced wind velocity and flutter derivatives. Making use of this FE model, damped complex eigenvalue analysis is carried out to determine the complex eigenvalues, of which the real part is the logarithm decay rate and the imaginary part is the damped vibration frequency. The condition for onset of flutter instability becomes that, at a certain wind velocity, the structural system incorporating fictitious Matrix27 elements has a complex eigenvalue with zero or near-zero real part, with the imaginary part of this eigenvalue being the flutter frequency. Case studies are provided to validate the developed procedure as well as to demonstrate the flutter analysis of cable-supported bridges using ANSYS. The proposed method enables the bridge designers and engineering practitioners to analyze flutter instability by using the commercial FE package ANSYS. | ||
| Key Words | ||
| long-span bridge; coupled flutter; instability; complex eigenvalue analysis; finite element (FE) model; ANSYS. | ||
| Address | ||
| X. G. Hua; Dept. of Civil and Structural Eng., The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong Z. Q. Chen; College of Civil Eng., Hunan University, Changsha, Hunan 410083, P. R. China Y. Q. Ni and J. M. Ko; Dept. of Civil and Structural Eng., The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong | ||