本文選題：主梁　切入點：風(fēng)致雪漂移　出處：《西南交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：風(fēng)致雪漂移現(xiàn)象已經(jīng)成為目前研究熱點。本文回顧了風(fēng)致雪漂移運動的研究現(xiàn)狀及其分析過程中存在的問題。采用FLUENT數(shù)值模擬軟件分析橋面積雪的二維分布,并通過風(fēng)洞試驗重點研究積雪對主梁顫振導(dǎo)數(shù)、渦激振動性能的影響,具體內(nèi)容以及結(jié)果如下：1、以截面為流線形的鋼箱梁斜拉橋為例,使用通用軟件Gambit建模以及劃分網(wǎng)格,通過FLUENT軟件數(shù)值模擬得到橋面積雪分布形狀。結(jié)果表明：積雪的沉積侵蝕與壁面摩擦速度有緊密的聯(lián)系,橋面背風(fēng)側(cè)積雪侵蝕量明顯比迎風(fēng)側(cè)侵蝕量小,在尾流處侵蝕量最小。2、通過風(fēng)洞試驗研究積雪對主梁三分力系數(shù)的影響：由于積雪作用,主梁升力系數(shù)與扭矩系數(shù)的曲線的斜率變大同時增幅在40%左右；阻力系數(shù)增大15%左右,且三分力系數(shù)變化趨勢基本不變。3、通過試驗分析積雪對主梁渦激振動性能的影響。試驗發(fā)現(xiàn)：由于積雪作用,主梁在+3。時的豎向渦激振動消失且三個風(fēng)速下的積雪的影響基本一致。4、經(jīng)風(fēng)洞試驗研究后認(rèn)為積雪對主梁顫振導(dǎo)數(shù)有一定的影響。由于積雪作用,由豎向運動位移引起的氣動慣性和氣動剛度對自激升力和扭矩的貢獻(xiàn)由負(fù)變正；由扭轉(zhuǎn)運動位移引起的氣動慣性和氣動剛度對自激扭矩的貢獻(xiàn)減小,且風(fēng)速20m/s時影響相對較大；折減風(fēng)速增大到2左右時,由扭轉(zhuǎn)運動速度引起的氣動阻尼對自激升力的貢獻(xiàn)變?yōu)樨?fù)。
[Abstract]:The wind-induced snow drift phenomenon has become the focus of research. This paper reviews the present situation and analysis of drift motion of wind-induced snow in question. By using FLUENT numerical simulation software to analyze the two-dimensional distribution of snow on the bridge, and through the research on the snow wind tunnel tests of flutter derivatives, vortex induced vibration performance influence, concrete contents and results are as follows: 1, to streamline the cross section of steel box girder cable-stayed bridge as an example, using Gambit software modeling and meshing, through FLUENT software numerical simulation of bridge snow distribution. The results showed that: there are closely related to erosion and deposition of snow wall surface friction velocity, deck erosion than the leeward side of the snow the windward side erosion, erosion of the minimum amount of.2 flow in the tail, through snow wind tunnel test on influence on beam three component coefficient: due to snow, Lord Liang Sheng The slope coefficient and torque coefficient curve becomes larger and an increase of about 40%; the resistance coefficient increased about 15%, and the three component coefficient trend unchanged.3, through the experimental analysis of influence of snow on the main beam of vortex induced vibration performance. Experiment results showed that: because of the snow, the effect of vertical vortex induced vibration disappeared when +3. beam and the three wind under the snow is consistent with the.4, the wind tunnel tests that snow has certain effects on the flutter derivatives. Because of the snow, the contribution caused by the vertical displacement of pneumatic inertia and aerodynamic stiffness of self-excited force and torque rise from negative to positive; caused by torsional displacement pneumatic inertia and aerodynamic stiffness on the self-excited torque contribution decreases, and the speed of 20m/s when the impact is relatively large; the reduced velocity increases to about 2, caused by torsional velocity of aerodynamic damping of self-excited rise The contribution of the force becomes negative.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3
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本文編號：1573484