【摘要】：顫振是一種具有極端破壞性的大跨度橋梁風(fēng)致振動(dòng),對(duì)于大跨橋梁風(fēng)致顫振的控制的研究一直是橋梁風(fēng)工程領(lǐng)域?qū)W者關(guān)注的重點(diǎn)。本文利用定常吸氣方法提升大跨度橋梁風(fēng)致顫振穩(wěn)定性,通過風(fēng)洞試驗(yàn)和基于計(jì)算流體動(dòng)力學(xué)的數(shù)值模擬相結(jié)合的方法研究定常吸氣對(duì)于大跨橋梁顫振控制的有效性,并探討橋梁顫振控制定常吸氣方法的流動(dòng)控制機(jī)理。具體研究工作包括:(1)定義了定常吸氣控制參數(shù),探討了橋梁箱型主梁結(jié)構(gòu)中定常吸氣的實(shí)現(xiàn)方式,基于分離流顫振理論及已有文獻(xiàn)研究結(jié)果分析了誘導(dǎo)大跨橋梁顫振發(fā)生的流場(chǎng)作用機(jī)理。(2)搭建了顫振導(dǎo)數(shù)識(shí)別自由振動(dòng)試驗(yàn)系統(tǒng),針對(duì)丹麥大貝爾特橋主梁剛性節(jié)段模型開展了顫振導(dǎo)數(shù)識(shí)別試驗(yàn),分析了定常吸氣對(duì)顫振導(dǎo)數(shù)及顫振臨界風(fēng)速的影響,驗(yàn)證了顫振穩(wěn)定性定常吸氣控制方法的有效性,探討了各個(gè)定常吸氣控制參數(shù)的變化對(duì)顫振控制效果的影響,獲得了最優(yōu)定常吸氣控制參數(shù)。(3)針對(duì)丹麥大貝爾特橋主梁剛性節(jié)段模型諧波振動(dòng)狀態(tài)繞流流場(chǎng)進(jìn)行了數(shù)值模擬,分析了定常吸氣作用下橋梁主梁繞流流場(chǎng)特性及氣動(dòng)力做功特點(diǎn),驗(yàn)證了定常吸氣方法對(duì)橋梁顫振控制的有效性,初步揭示了定常吸氣的顫振控制機(jī)理。
[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(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441.3

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