雙開槽箱梁斷面懸索橋的抗風(fēng)性能及氣動措施研究
本文選題:雙開槽箱梁 + 顫振; 參考:《振動與沖擊》2017年10期
【摘要】:為研究雙開槽箱梁斷面橋梁的抗風(fēng)性能,并提出合理的顫振和渦振氣動控制措施,本文以擬建的某鋼箱梁懸索橋為研究對象,開展了一系列節(jié)段模型風(fēng)洞試驗,并結(jié)合二維三自由度方法和CFD數(shù)值模擬分別分析了不同措施下顫振和渦振機理的改變。研究表明:相比于單箱梁斷面,雙開槽斷面能有效的改善顫振性能;防撞欄桿基座的有無,對該類橋的顫振臨界風(fēng)速影響顯著;中央穩(wěn)定板作為改善顫振穩(wěn)定性的常用手段,對提高雙開槽斷面顫振臨界風(fēng)速同樣適用,且在一定范圍內(nèi),臨界風(fēng)速與穩(wěn)定板高度正相關(guān);二維三自由度分析結(jié)果顯示,中央穩(wěn)定板和較優(yōu)形式的欄桿均能減緩氣動阻尼隨風(fēng)速的變化趨勢。針對開槽引起渦振的問題,嘗試采用各種控制措施,試驗證明,均勻間隔的縱向格柵能有效的抑制渦振。結(jié)合CFD模擬,其根本原因為縱向格柵明顯改變了流場繞流特性,阻礙了大規(guī)模渦脫的形成。
[Abstract]:In order to study the anti-wind performance of double-slotted box girder cross-section bridges and to put forward reasonable aerodynamic control measures for flutter and vortex vibration, a series of segmental model wind tunnel tests were carried out in this paper, taking a steel box girder suspension bridge as an object of study. The changes of flutter and vortex vibration mechanism under different measures are analyzed by using two-dimensional three-degree-of-freedom method and CFD numerical simulation. The results show that: compared with single box girder section, double slotted section can effectively improve flutter performance, the existence of anti-collision railing base has a significant effect on the flutter critical wind speed of this kind of bridge, and the central stabilizer board is used as a common means to improve flutter stability. It is also applicable to increase the critical flutter velocity of double slotted section, and in a certain range, the critical wind speed is positively correlated with the height of the stabilizing plate, and the results of 2-D three-degree-of-freedom analysis show that, Both the central stabilizing plate and the better type of railing can slow down the trend of aerodynamic damping with wind speed. Aiming at the problem of vortex vibration caused by grooving, various control measures are used. The experiment shows that the longitudinal grid with uniform spacing can effectively suppress the vortex vibration. Combined with CFD simulation, the main reason is that the longitudinal grid obviously changes the flow characteristics around the flow field and hinders the formation of large-scale vortex detachment.
【作者單位】: 同濟大學(xué)土木工程防災(zāi)國家重點實驗室;
【基金】:土木工程防災(zāi)國家重點實驗室“973計劃”項目(2013CB036301)
【分類號】:U448.25
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