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Wind and Structures Volume 10, Number 3, May 2007, pages 215-232 DOI: http://dx.doi.org/10.12989/was.2007.10.3.215 |
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A study of wind effect on damping and frequency of a long span cable-stayed bridge from rational function approximation of self-excited forces |
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Shambhu Sharan Mishra, Krishen Kumar and Prem Krishna
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| Abstract | ||
| This paper presents an aeroelastic analysis procedure to highlight the influence of wind velocity on the structural damping and frequency of a long span cable-stayed bridge. Frequency dependent self-excited forces in terms of flutter derivatives are expressed as continuous functions using rational function approximation technique. The aeroelastically modified structural equation of motion is expressed in terms of frequency independent modal state-space parameters. The modal logarithmic dampings and frequencies corresponding to a particular wind speed are then determined from the eigen solution of the state matrix. | ||
| Key Words | ||
| cable stayed bridge; bridge aerodynamics; aeroelastic response; frequency; damping; rational function approximation. | ||
| Address | ||
| Shambhu Sharan Mishra; Department of Civil Engineering, NERIST, Nirjuli, Arunachal Pradsh-791109, India Krishen Kumar and Prem Krishna; Department of Civil Engineering, Indian Institute of Technology, Roorkee-247667, India | ||