本文選題：半開(kāi)口分離雙箱梁 + 渦激振動(dòng)��； 參考：《土木工程學(xué)報(bào)》2017年03期

【摘要】：基于某主跨820m混合梁斜拉橋,利用剛體節(jié)段模型風(fēng)洞試驗(yàn)結(jié)合計(jì)算流體動(dòng)力學(xué)(CFD)數(shù)值模擬,系統(tǒng)研究了半開(kāi)口分離雙箱梁的渦振性能并進(jìn)行一系列氣動(dòng)控制措施的探討。該斷面成橋狀態(tài)在+3°或+5°風(fēng)攻角下會(huì)產(chǎn)生大幅豎彎渦振,來(lái)流上游側(cè)檢修道欄桿處的氣流分離起主導(dǎo)作用,檢修車(chē)軌道對(duì)豎彎渦振有放大作用,這主要源于其后方連續(xù)產(chǎn)生的小尺度漩渦在斷面下部開(kāi)口內(nèi)匯聚,形成了能量集中的大尺度漩渦。采用不同形式的檢修道欄桿或改變風(fēng)嘴角度對(duì)豎彎渦振控制效果不理想,將風(fēng)嘴向外延伸可以有效降低振幅,但要保證檢修道欄桿不移動(dòng),工程實(shí)用性較差。下中央穩(wěn)定板基本沒(méi)有抑制效果;水平翼板和抑流板都能有效控制豎彎渦振,其中水平翼板可以延緩漩渦能量的集中降低渦振振幅,但不能完全抑制振動(dòng),而且大攻角下會(huì)延長(zhǎng)渦振風(fēng)速區(qū)間;抑流板則直接通過(guò)抑制斷面上表面漩渦的形成而有效控制渦振發(fā)生。
[Abstract]:Based on a cable-stayed bridge with 820m main span hybrid beam, the vortex vibration performance of a semi-open separated double box girder is systematically studied by using a rigid segment model wind tunnel test combined with the numerical simulation of computational fluid dynamics (CFD), and a series of aerodynamic control measures are discussed. Under the condition of 3 擄or 5 擄wind attack, the cross-section will produce large vertical bending vortex vibration, and the flow separation at the railing of the overhauling track on the upstream side of the incoming flow will play a leading role, and the vehicle repair track will amplify the vertical bending vortex vibration. This is mainly due to the small scale vortex which is produced continuously behind the cross section and converges in the opening of the lower section, forming a large scale swirl of energy concentration. It is not ideal to control the vertical bending vortex vibration by adopting different forms of overhaul rail or changing the angle of the wind nozzle. The amplitude can be effectively reduced by extending the wind nozzle outward, but the engineering practicability is poor to ensure that the railing of the overhaul track does not move. The horizontal flange and flow suppression plate can effectively control the vertical bending vortex vibration, in which the horizontal wing plate can delay the concentration of vortex energy and reduce the amplitude of vortex vibration, but it can not completely suppress the vibration. Moreover, the wind speed range of vortex vibration will be prolonged at high angle of attack, and the vortex vibration can be effectively controlled by suppressing the formation of vortex on the surface of the section directly.
【作者單位】： 同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：科技部國(guó)家重點(diǎn)基礎(chǔ)研究973計(jì)劃(2013CB036300) 國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(51323013) 國(guó)家重點(diǎn)實(shí)驗(yàn)室自主課題(SLDRCE 10-B-05)
【分類(lèi)號(hào)】：U441.3

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