【摘要】：近些年來(lái),隨著橋梁設(shè)計(jì)和施工水平的不斷提高,橋梁跨徑急劇增加,橋梁結(jié)構(gòu)趨于大跨、輕質(zhì)、低阻尼,使得橋梁渦激振動(dòng)的研究越來(lái)越重要。在橋梁設(shè)計(jì)中,Π型橋梁斷面因其具有良好的經(jīng)濟(jì)性,開(kāi)始廣泛應(yīng)用于大跨徑橋梁中。對(duì)于Π型橋梁斷面的渦激共振問(wèn)題,國(guó)內(nèi)外很多學(xué)者做了大量研究,但對(duì)于欄桿構(gòu)造因素對(duì)Π型橋梁斷面渦激振動(dòng)的影響很少有學(xué)者進(jìn)行較為系統(tǒng)的研究。因而對(duì)于欄桿構(gòu)造因素對(duì)Π型橋梁斷面渦激振動(dòng)影響的研究以及通過(guò)欄桿構(gòu)造的設(shè)計(jì)避免渦激共振或者抑制其振動(dòng)幅值的研究實(shí)際工程應(yīng)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(fēng)洞試驗(yàn)研究欄桿透風(fēng)率對(duì)Π型橋梁斷面渦激振動(dòng)的影響。并采用數(shù)值模擬技術(shù)就欄桿橫梁斷面型式、高度、傾角等風(fēng)洞試驗(yàn)較難實(shí)現(xiàn)的構(gòu)造因素對(duì)Π型橋梁斷面渦激振動(dòng)的影響進(jìn)行研究,得到抑制Π型橋梁斷面渦激振動(dòng)的欄桿優(yōu)化斷面、參數(shù)化高度因子λ、合理傾角θ及透風(fēng)率φ,為該類(lèi)斷面橋梁在抗風(fēng)設(shè)計(jì)時(shí)提供參考。最后從繞流流場(chǎng)速度和渦量、表面壓力系數(shù)與根方差值等方面微觀(guān)解釋欄桿構(gòu)造影響Π型橋梁斷面渦激振動(dòng)的內(nèi)在原因并驗(yàn)證了數(shù)值計(jì)算結(jié)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(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441.3

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本文編號(hào)：2243514