本文關(guān)鍵詞： 大跨度橋梁 抖振 抖振力相關(guān)性 三維抖振力 三維導(dǎo)納 雙指數(shù)相干函數(shù)　出處：《西南交通大學(xué)》2015年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：本文借鑒經(jīng)典紊流張量理論,通過(guò)三維抖振力模型,建立了兩波數(shù)抖振力和氣動(dòng)導(dǎo)納函數(shù)的風(fēng)洞試驗(yàn)直接識(shí)別方法。針對(duì)矩形斷面及大跨橋梁中常用的流線型箱梁斷面,通過(guò)大量風(fēng)洞試驗(yàn)深入研究了抖振力形成機(jī)理及能量傳遞模式,并提出了抖振力相干函數(shù)數(shù)學(xué)模型。并據(jù)此建立了適用于工程實(shí)際的三維實(shí)用抖振力模型,為精確分析大跨度橋梁抖振響應(yīng)提供重要依據(jù)。本文的主要研究?jī)?nèi)容有以下幾點(diǎn)：1.介紹了各向同性紊流張量分析理論以及薄機(jī)翼抖振力和三維傳遞函數(shù)(氣動(dòng)導(dǎo)納函數(shù))的分析方法,總結(jié)了橋梁風(fēng)工程中常用的抖振力和氣動(dòng)導(dǎo)納模型,并探討了目前抖振分方法論中存在的一些問(wèn)題。2.利用經(jīng)典的翼型抖振力三維分析方法,通過(guò)對(duì)抖振力互譜進(jìn)行二維Fourier變換,提出了兩波數(shù)抖振力譜及氣動(dòng)導(dǎo)納的通用識(shí)別方法。而且該方法可以通過(guò)現(xiàn)有風(fēng)洞試驗(yàn)技術(shù)直接識(shí)別。在此基礎(chǔ)上改進(jìn)了薄機(jī)翼三維實(shí)用抖振力模型,提出了具有嚴(yán)格物理意義的抖振力雙指數(shù)相干函數(shù)模型,從理論上證明了抖振力的相關(guān)性必定會(huì)高于脈動(dòng)風(fēng)速的相關(guān)性,并將該模型擴(kuò)展以使其能夠應(yīng)用于具有任意斷面的線狀細(xì)長(zhǎng)結(jié)構(gòu)。3.通過(guò)一系列節(jié)段模型測(cè)壓試驗(yàn),詳細(xì)研究了矩形斷面抖振力三維分布特性,流固相互作用機(jī)理以及能量傳遞模式。通過(guò)綜合考慮矩形斷面特征尺寸和紊流積分尺度對(duì)于抖振力空間相關(guān)性的影響,提出了矩形斷面抖振力相干函數(shù)數(shù)學(xué)模型。4.針對(duì)大跨橋梁中常用的流線型箱梁,通過(guò)不同幾何縮尺比的節(jié)段模型測(cè)壓試驗(yàn),提出了流線型箱梁抖振力相干函數(shù)數(shù)學(xué)模型。并完善了線狀細(xì)長(zhǎng)鈍體結(jié)構(gòu)三維實(shí)用抖振力模型。最后,以一大跨度斜拉橋?yàn)槔f(shuō)明了該模型在大跨度橋梁抖振響應(yīng)分析中的應(yīng)用。
[Abstract]:Based on classical turbulent Zhang Liang's theory and 3D buffeting force model, a direct identification method for wind tunnel test of two wave number buffeting force and aerodynamic admittance function is established in this paper. The formation mechanism and energy transfer model of buffeting force are studied through a large number of wind tunnel tests, and a mathematical model of buffeting force coherence function is proposed. Based on this model, a three-dimensional practical buffeting force model suitable for engineering practice is established. This paper provides an important basis for accurate analysis of buffeting response of long-span bridges. The main contents of this paper are as follows: 1.The theory of isotropic turbulent Zhang Liang analysis, the buffeting force of thin wing and three-dimensional transfer function (aerodynamic conductance) are introduced. Method of analysis, This paper summarizes the buffeting force and aerodynamic admittance models commonly used in bridge wind engineering, and discusses some problems existing in the buffeting component methodology at present .2.Using the classical three-dimensional analysis method of buffeting force of airfoil, the cross-spectrum of buffeting force is transformed by two-dimensional Fourier transform. A general identification method for buffeting force spectrum and aerodynamic admittance of two wavenumber is proposed, and the method can be directly identified by existing wind tunnel test techniques. Based on this, a three-dimensional practical buffeting force model for thin wing is improved. A double exponential coherent function model of buffeting force with strict physical meaning is proposed. It is proved theoretically that the correlation of buffeting force will be higher than that of fluctuating wind speed. The model is extended so that it can be applied to linear slender structures with arbitrary sections. The three-dimensional distribution of buffeting forces on rectangular sections is studied in detail by a series of segmental model tests. The mechanism of fluid-solid interaction and the energy transfer model. The effects of the characteristic size of rectangular section and the turbulent integral scale on the spatial correlation of buffeting force are considered synthetically. A mathematical model of coherent function of buffeting force on rectangular section is presented. 4. For the streamlined box girders commonly used in long span bridges, the pressure measurement tests are carried out by using segmental models with different geometric scale ratios. A mathematical model of buffeting force coherence function of streamlined box girder is presented, and the 3D practical buffeting force model of thin thin blunt body structure is improved. A long-span cable-stayed bridge is taken as an example to illustrate the application of the model to the buffeting response analysis of long-span bridges.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441.3

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