【摘要】：近些年來,隨著橋梁設計和施工水平的不斷提高,橋梁跨徑急劇增加,橋梁結構趨于大跨、輕質、低阻尼,使得橋梁渦激振動的研究越來越重要。在橋梁設計中,Π型橋梁斷面因其具有良好的經濟性,開始廣泛應用于大跨徑橋梁中。對于Π型橋梁斷面的渦激共振問題,國內外很多學者做了大量研究,但對于欄桿構造因素對Π型橋梁斷面渦激振動的影響很少有學者進行較為系統(tǒng)的研究。因而對于欄桿構造因素對Π型橋梁斷面渦激振動影響的研究以及通過欄桿構造的設計避免渦激共振或者抑制其振動幅值的研究實際工程應用意義重大。論文選取鰲江特大橋Π型主梁斷面為工程背景,依托風洞試驗研究欄桿透風率對Π型橋梁斷面渦激振動的影響。并采用數值模擬技術就欄桿橫梁斷面型式、高度、傾角等風洞試驗較難實現(xiàn)的構造因素對Π型橋梁斷面渦激振動的影響進行研究,得到抑制Π型橋梁斷面渦激振動的欄桿優(yōu)化斷面、參數化高度因子λ、合理傾角θ及透風率φ,為該類斷面橋梁在抗風設計時提供參考。最后從繞流流場速度和渦量、表面壓力系數與根方差值等方面微觀解釋欄桿構造影響Π型橋梁斷面渦激振動的內在原因并驗證了數值計算結果的正確性。
[Abstract]:In recent years, with the continuous improvement of bridge design and construction level, the span of bridge increases dramatically, and the bridge structure tends to long span, light weight and low damping, which makes the study of vortex-induced vibration of bridge more and more important. In the design of bridge, due to its good economy, the cross section of 蟺 type bridge has been widely used in long span bridges. Many scholars at home and abroad have done a great deal of research on the vortex-induced resonance of the section of a 蟺 type bridge, but few scholars have systematically studied the influence of railing structure on the vortex-induced vibration of the section of the 蟺 type bridge. Therefore, it is of great significance to study the influence of railing structure factors on the vortex-induced vibration of the section of the 蟺 type bridge and to study the practical engineering application of avoiding the vortex-induced resonance or suppressing the vibration amplitude through the design of the railing structure. In this paper, based on wind tunnel test, the influence of railing air permeability on the vortex-induced vibration of the cross section of A large bridge is studied. Numerical simulation technique is used to study the influence of structural factors such as section type, height and inclination angle of railing beam on the vortex-induced vibration of the section of a 蟺 type bridge, which is difficult to realize in wind tunnel tests. The optimized section of railing, the parameterized height factor 位, the reasonable inclination 胃 and the air permeability 蠁, which can suppress the vortex-induced vibration of the section of the 蟺 type bridge, are obtained, which provides a reference for the design of this type of cross-section bridge in the wind-resistant design. Finally, the internal reasons of the influence of railing structure on the vortex-induced vibration of the cross section of a 蟺 type bridge are explained from the aspects of velocity and vorticity over the flow field, the difference between the surface pressure coefficient and the root square, and the correctness of the numerical results is verified.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3

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