本文關(guān)鍵詞： 斜拉索 雷諾數(shù)效應(yīng) 氣動力系數(shù) 馳振 相關(guān)性　出處：《石家莊鐵道大學》2015年碩士論文　論文類型：學位論文

【摘要】：斜拉橋斜拉索的風致振動問題一直以來都是風工程界的研究熱點,其中斜拉索風雨激振和干索馳振等問題更是研究中的難點。在實際斜拉索運輸、安裝過程中,由于擠壓等各種原因,斜拉索有可能變成非標準圓形截面,其氣動力和風致振動特性是值得研究的問題。針對這種情況,因此,本次研究選取了長軸與短軸比值分別為1.05:1、1.1:1、1.15:1和1.3:1四種非標準圓形斜拉索模型進行了剛性模型風洞測壓試驗,通過試驗得到了斜拉索的氣動性能在不同風向角下隨雷諾數(shù)的變化情況。本文的主要研究內(nèi)容如下:(1)介紹了研究斜拉索氣動性能的重要性和斜拉索風致振動的形式,總結(jié)了目前國內(nèi)外專家、學者對斜拉索風致振動的振動機理和抑制振動的方法的研究。(2)通過對雷諾數(shù)與斜拉索模型氣動力之間的關(guān)系研究,獲得了四種非標準圓截面斜拉索模型的平均阻力系數(shù)、平均升力系數(shù)、平均扭矩系數(shù)隨雷諾數(shù)變化的情況,比較了每一種拉索模型在不同風向角下三分力系數(shù)的雷諾數(shù)效應(yīng),比較了四種截面拉索模型在不同風向角下三分力系數(shù)的雷諾數(shù)效應(yīng)。(3)利用Den Hartog馳振判據(jù)和Nigol馳振判據(jù),分析了四種非標準圓截面斜拉索模型的Den Hartog馳振判據(jù)系數(shù)和Nigol馳振判據(jù)系數(shù)在臨界雷諾數(shù)范圍內(nèi)變化的情況,比較了不同風向角下每一種拉索模型馳振穩(wěn)定性與雷諾數(shù)的關(guān)系。比較了四種截面拉索模型在不同風向角下雷諾數(shù)對兩種馳振判據(jù)系數(shù)的影響。(4)研究了雷諾數(shù)與斜拉索模型展向升力系數(shù)相關(guān)性之間的關(guān)系,分析了四種非標準圓截面斜拉索模型的不同測壓部位相關(guān)系數(shù)隨雷諾數(shù)變化的情況,比較了每一種拉索模型在不同風向角下升力系數(shù)相關(guān)系數(shù)隨雷諾數(shù)的變化情況。比較了四種截面拉索模型在不同風向角下雷諾數(shù)對升力系數(shù)相關(guān)系數(shù)系數(shù)的影響。
[Abstract]:The problem of wind-induced vibration of cable-stayed bridge has always been a hot research topic in wind engineering field, among which wind-stayed cable wind-induced vibration and dry cable galloping vibration are even more difficult. As a result of extrusion and other reasons, the cable may become a non-standard circular section. The aerodynamic and wind-induced vibration characteristics of the cable are worth studying. In this study, four kinds of non-standard circular cable-stayed cable models with long axis and short axis ratios of 1.05: 1: 1.1: 1: 1.15: 1 and 1.3: 1 were selected for wind tunnel pressure measurement with rigid model. The variation of aerodynamic performance of stay cables with Reynolds number at different wind angles is obtained by experiments. The main contents of this paper are as follows: 1) the importance of studying the aerodynamic performance of stay cables and the wind-induced vibration of stay cables are introduced. In this paper, experts and scholars at home and abroad have studied the mechanism of wind-induced vibration of stay cables and the methods to suppress vibration. The relationship between Reynolds number and aerodynamic force of cable model has been studied. The average drag coefficient, average lift coefficient and average torque coefficient of four kinds of non-standard circular section cable models are obtained. The Reynolds number effects of the three-point force coefficients of each cable model under different wind direction angles are compared. The Reynolds number effect of the three-point force coefficient of four cross-section cable models under different wind direction angles is compared by using Den Hartog galloping criterion and Nigol galloping criterion. The variation of Den Hartog criterion coefficient and Nigol galloping criterion coefficient in the range of critical Reynolds number for four kinds of non-standard circular section cable models are analyzed. The relation between the galloping stability and Reynolds number of each cable model at different wind direction angles is compared. The effects of Reynolds number on the two galloping criterion coefficients of four cross-section cable models at different wind direction angles are compared. The relationship between the spanwise lift coefficient of the cable model, In this paper, the variation of the correlation coefficient of different pressure measuring parts with Reynolds number in four kinds of non-standard cable models with circular section is analyzed. The variation of the coefficient of lift coefficient with Reynolds number at different wind angles for each cable model is compared, and the influence of Reynolds number on the coefficient of lift coefficient at different angles of wind direction is compared.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U446;U448.27

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本文編號：1499741