基于定常吸氣的大跨橋梁風(fēng)致顫振流動控制
[Abstract]:Flutter is an extremely destructive wind-induced vibration of long-span bridges. The research on wind-induced flutter control of long-span bridges has always been the focus of attention in the field of bridge wind engineering. In this paper, the steady suction method is used to improve the wind-induced flutter stability of long-span bridges. The effectiveness of steady suction on flutter control of long-span bridges is studied by wind tunnel test and numerical simulation based on computational fluid dynamics. The flow control mechanism of the steady suction method for bridge flutter control is also discussed. The specific research work includes: (1) the parameters of steady inspiratory control are defined, and the realization mode of steady inspiratory in bridge box girder structure is discussed. The mechanism of flutter induced flutter in long-span bridges is analyzed based on the flutter theory of separated flow and the results of previous literatures. (2) A flutter derivative identification system for free vibration is established. A flutter derivative identification test is carried out for the rigid segment model of the main girder of the Grand Belt Bridge in Denmark. The effect of steady suction on flutter derivative and flutter critical wind speed is analyzed, and the effectiveness of the steady suction control method for flutter stability is verified. The influence of the parameters of steady suction control on flutter control is discussed, and the optimal parameters of steady inspiratory control are obtained. (3) the numerical simulation of the flow field around the harmonic vibration state of the rigid segment model of the main girder of the Grand Belt Bridge in Denmark is carried out. The characteristics of flow field and aerodynamic work around the bridge main beam under steady suction are analyzed. The effectiveness of the steady suction method for bridge flutter control is verified and the flutter control mechanism of steady suction is preliminarily revealed.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U441.3
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