Flutter mitigation of a superlong-span suspension bridge with a double-deck truss girder through wind tunnel tests
| Autor: | Yanguo Sun, Mingshui Li, Haili Liao, Ming Li, Yongfu Lei |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
business.industry
Mechanical Engineering Aerospace Engineering Truss 020101 civil engineering 02 engineering and technology Structural engineering Span (engineering) 0201 civil engineering Deck Vibration 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Girder Automotive Engineering Flutter General Materials Science business Suspension (vehicle) Geology Wind tunnel |
| Zdroj: | Journal of Vibration and Control. 27:1584-1594 |
| ISSN: | 1741-2986 1077-5463 |
| Popis: | As flutter is a very dangerous wind-induced vibration phenomenon, the mitigation and control of flutter are crucial for the design of long-span bridges. In the present study, via a large number of section model wind tunnel tests, the flutter performance of a superlong-span suspension bridge with a double-deck truss girder was studied, and a series of aerodynamic and structural measures were used to mitigate and control its flutter instability. The results show that soft flutter characterized by a lack of an evident divergent point occurred for the double-deck truss girder. Upper central stabilizers on the upper deck, lower stabilizers below the lower deck, and horizontal flaps installed beside the bottoms of the sidewalks are all effective in suppressing flutter for this kind of truss girder. By combining the structural design with aerodynamic optimizations, a redesigned truss girder with widened upper carriers and sidewalks, and double lower stabilizers combined with the inspection vehicle rails is identified as the optimal flutter mitigation scheme. It was also found that the critical flutter wind speed increases with the torsional damping ratio, indicating that the dampers may be efficient in controlling soft flutter characterized by single-degree-of-freedom torsional vibration. This study aims to provide a useful reference and guidance for the flutter design optimization of long-span bridges with double-deck truss girders. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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