本文選題：峽谷風(fēng) + CFD��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：風(fēng)特性是抗風(fēng)研究的基礎(chǔ),尤其對(duì)于西部山區(qū)來(lái)說(shuō),峽谷風(fēng)場(chǎng)特性的研究對(duì)于工程抗風(fēng)設(shè)計(jì)有著非常重要的參考價(jià)值。目前,風(fēng)洞試驗(yàn)和數(shù)值模擬是風(fēng)參數(shù)研究的主要手段。對(duì)于山區(qū)橋梁工程的抗風(fēng)問(wèn)題,雖然國(guó)內(nèi)外都曾進(jìn)行過(guò)一些探討和研究,但是實(shí)測(cè)資料嚴(yán)重匱乏,相關(guān)的文獻(xiàn)資料也較少,山區(qū)峽谷風(fēng)特性的研究也較為膚淺,值得更為深入的探究。本文以山區(qū)峽谷橋址區(qū)的風(fēng)場(chǎng)為研究目標(biāo),為了便于利用風(fēng)洞試驗(yàn)和數(shù)值模擬研究峽谷的形式和坡度變化對(duì)其內(nèi)部風(fēng)場(chǎng)的影響,將峽谷抽象為簡(jiǎn)化的U型谷,變換峽谷底部寬度與斜坡傾斜角度以得到不同峽谷形式,通過(guò)數(shù)值模擬方法,建立立體幾何模型,劃分網(wǎng)格并添加邊界條件,計(jì)算其內(nèi)部平均風(fēng)速的大小,分析風(fēng)場(chǎng)的分布特征以及不同峽谷形式之間的關(guān)聯(lián),給出風(fēng)速剖面的計(jì)算結(jié)果,推出峽谷內(nèi)部平均風(fēng)的空間分布規(guī)律。通過(guò)風(fēng)洞試驗(yàn),測(cè)量峽谷模型內(nèi)部的平均風(fēng)速的大小和方向,驗(yàn)證數(shù)值模擬方法的科學(xué)性和合理性。對(duì)數(shù)值計(jì)算結(jié)果和風(fēng)洞試驗(yàn)結(jié)果進(jìn)行整理和擬合,并參考相關(guān)文獻(xiàn)和前人的經(jīng)驗(yàn),提出山區(qū)峽谷橋梁抗風(fēng)設(shè)計(jì)基準(zhǔn)風(fēng)速的修正的經(jīng)驗(yàn)公式。針對(duì)峽谷內(nèi)部風(fēng)速垂直分布的相關(guān)規(guī)律,分析驗(yàn)證了峽谷內(nèi)部不同高度位置處橋梁抗風(fēng)設(shè)計(jì)基準(zhǔn)風(fēng)速的修正的經(jīng)驗(yàn)公式。根據(jù)相關(guān)資料對(duì)該風(fēng)速經(jīng)驗(yàn)公式進(jìn)行驗(yàn)證,取得良好的結(jié)果。
[Abstract]:Wind characteristic is the foundation of wind resistance research, especially for western mountainous area, the study of canyon wind field characteristics has very important reference value for engineering wind-resistant design. At present, wind tunnel test and numerical simulation are the main means of wind parameter research. As for the wind-resistant problem of bridge engineering in mountainous areas, although there have been some discussions and studies both at home and abroad, the measured data are seriously scarce, the relevant literature is also less, and the study of wind characteristics of mountain canyons is also superficial. It is worth exploring more deeply. In this paper, the wind field in the mountain canyon bridge site is taken as the research object. In order to study the influence of the canyon form and slope change on the inner wind field by wind tunnel test and numerical simulation, the canyon is abstracted as a simplified U-shaped valley. Different canyon forms are obtained by changing the width of the canyon bottom and the slope inclination angle. Through the numerical simulation method, the three-dimensional geometry model is established, the grid is divided and the boundary conditions are added to calculate the magnitude of the average wind speed inside the canyon. The distribution characteristics of wind field and the correlation between different canyons are analyzed. The results of wind speed profile are given and the spatial distribution of mean wind in canyons is deduced. Through wind tunnel test, the magnitude and direction of the mean wind speed inside the canyon model were measured to verify the scientific and reasonable of the numerical simulation method. The numerical calculation results and wind tunnel test results are arranged and fitted. With reference to relevant literature and previous experience, an empirical formula for revising the wind speed of wind resistant design of mountain canyon bridges is put forward. According to the correlation law of vertical distribution of wind speed in canyons, the modified empirical formula of wind resistance design benchmark wind speed of bridges at different heights in canyons is analyzed and verified. According to the relevant data, the empirical formula of wind speed is verified and good results are obtained.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U442

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

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本文編號(hào)：1861621