Aerodynamic shape optimization emphasizing static stability for a super-longspan cable-stayed bridge with a central-slotted box deck
Ledong Zhu,Cheng Qian,Yikai Shen,Qing Zhu
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.
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
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