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Wind and Structures Volume 35, Number 5, November 2022 , pages 337-351 DOI: https://doi.org/10.12989/was.2022.35.5.337 |
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Aerodynamic shape optimization emphasizing static stability for a super-longspan cable-stayed bridge with a central-slotted box deck |
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Ledong Zhu, Cheng Qian, Yikai Shen and Qing Zhu
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| Abstract | ||
| As central-slotted box decks usually have excellent flutter performance, studies on this type of deck mostly focus on the vortex-induced vibration (VIV) control. Yet with the increasing span lengths, cable-supported bridges may have critical wind speeds of wind-induced static instability lower than that of the flutter. This is especially likely for bridges with a central-slotted box deck. As a result, the overall aerodynamic performance of such a bridge will depend on its wind-induced static stability. Taking a 1400 m-main-span cable-stayed bridge as an example, this study investigates the influence of a series of deck shape parameters on both static and flutter instabilities. Some crucial shape parameters, like the height ratio of wind fairing and the angle of the inner-lower web, show opposite influences on the two kinds of instabilities. The aerodynamic shape optimization conducted for both static and flutter instabilities on the deck based on parameter-sensitivity studies raises the static critical wind speed by about 10%, and the overall critical wind speed by about 8%. Effective VIV countermeasures for this type of bridge deck have also been proposed. | ||
| Key Words | ||
| aerodynamic shape optimization; central-slotted box deck; flutter; super-long-span cable-stayed bridge; vortexinduced vibration; wind-induced static stabi | ||
| Address | ||
| Ledong Zhu,Cheng Qian and Qing Zhu:1)State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China 2)epartment of Bridge Engineering, Tongji University, Shanghai 200092, China 3)Key Laboratory of Transport Industry of Bridge Wind Resistance Technology, Tongji University, Shanghai 200092, China Yikai Shen:Shanghai Research Institute of Building Sciences, Shanghai 200092, China | ||