The First Results for a New Layout of the Stay Cables for Great Span Bridges
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- 作者：L. Anania ; A. Badalà ; S. Costa ; G. D’ ; agata
- 关键词：Cable stayed bridge ; air-elastic effects ; pattern stay
- 刊名：Procedia Engineering
- 出版年：2011
- 出版时间：2011
- 年：2011
- 卷：14
- 期：Complete
- 页码：1493-1500
- 全文大小：604 K
文摘
The air-elastic vibrations of structures induce fluctuating stresses that lead to fatigue damage accumulation and may determine structural failure without exceeding ultimate strength This paper proposes a new layout of stay cables to be used in the construction or the retrofitting of long span bridges, capable of mitigating the air-elastic problems due to environmental vibrations such as the rain-wind excitations. The structural scheme adopted was derived from the critical conditions in terms of stability obtained by referring to lateral suspension cables stayed bridge with two planes of fan pattern stay cables. The new layout consists in implementing an additional plane of cable stays placed symmetrically just under the deck bridge. The final layout of the cable stays was identified as ¡°duplex? The numerical investigation was carried out in the frequency domain. The results obtained show a sensible increasing of stiffness, as well as a reduction of the natural period of vibrations. In the analysis the deck was considered as thin and very light. The Duplex layout had, also, permitted to mitigate the wind effects, because the presence of the inferior stay cables simulate the viscous dampers.