Wind and Structures

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Aerodynamic shape optimization emphasizing static stability for a super-long-span cable-stayed bridge with a central-slotted box deck

  • Ledong, Zhu (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Cheng, Qian (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Yikai, Shen (Shanghai Research Institute of Building Sciences) ;
  • Qing, Zhu (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University)
  • Received : 2021.03.18
  • Accepted : 2022.09.22
  • Published : 2022.11.25
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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.

Keywords

Acknowledgement

The work described in this paper was jointly supported by the National Natural Science Foundation of China (Grant 51938012) and the Fundamental Research Fund for State Key Laboratories from the Ministry of Science and Technology of China (SLDRCE19-A-15), for which the authors are very grateful. The authors also would like to express their appreciation to Prof. Rucheng Xiao, Dr. Bin Sun and their graduate students, Ms Cong Wang from the Department of Bridge Engineering of Tongji University, for the preliminary design of the super-long cable-stayed bridges investigated in this study.

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