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Wind and Structures Volume 27, Number 3, September 2018 , pages 175-186 DOI: https://doi.org/10.12989/was.2018.27.3.175 |
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Reliability analysis on flutter of the long-span Aizhai bridge |
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Shuqian Liu, C.S. Cai, Yan Han and Chunguang Li
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| Abstract | ||
| With the continuous increase of span lengths, modern bridges are becoming much more flexible and more prone to flutter under wind excitations. A reasonable probabilistic flutter analysis of long-span bridges involving random and uncertain variables may have to be taken into consideration. This paper presents a method for estimating the reliability index and failure probability due to flutter, which considers the very important variables including the extreme wind velocity at bridge site, damping ratio, mathematical modeling, and flutter derivatives. The Aizhai Bridge in China is selected as an example to demonstrate the numerical procedure for the flutter reliability analysis. In the presented method, the joint probability density function of wind speed and wind direction at the deck level of the bridge is first established. Then, based on the fundamental theories of structural reliability, the reliability index and failure probability due to flutter of the Aizhai Bridge is investigated by applying the Monte Carlo method and the first order reliability method (FORM). The probabilistic flutter analysis can provide a guideline in the design of long-span bridges and the results show that the structural damping and flutter derivatives have significant effects on the flutter reliability, more accurate and reliable data of which is needed. | ||
| Key Words | ||
| flutter reliability; critical flutter velocity; long-span suspension bridges; flutter derivatives; Monte Carlo method; first order reliability method | ||
| Address | ||
| Shuqian Liu and C.S. Cai: Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, USA, LA 70803 Yan Han and Chunguang Li: School of Civil Engineering, Changsha University of Science & Technology, Changsha, China, 410004 | ||