山區(qū)峽谷橋址處風(fēng)場特性實(shí)測研究與數(shù)值模擬
發(fā)布時間：2019-05-20 04:11
【摘要】：隨著西部戰(zhàn)略的逐步實(shí)施,在中西部山區(qū)峽谷地區(qū)將有越來越多的大跨度柔性橋梁被修建,為了保證此類橋梁的順利建造和正常的運(yùn)營,準(zhǔn)確的風(fēng)荷載輸入是大跨度柔性橋梁抗風(fēng)設(shè)計(jì)的先決條件。但是,山區(qū)峽谷地區(qū)地勢崎嶇、環(huán)境復(fù)雜,風(fēng)場特性各項(xiàng)參數(shù)很難確定,現(xiàn)行橋梁抗風(fēng)規(guī)范中關(guān)于峽谷地形條件下的風(fēng)場特性也沒有詳細(xì)的規(guī)定。因此,對山區(qū)峽谷風(fēng)場特性的研究是非常有必要的。本文依托交通部西部課題重大專項(xiàng)“特大型橋梁風(fēng)雨作用監(jiān)測與模擬技術(shù)研究”,對澧水大橋橋位處風(fēng)場特性進(jìn)行了如下研究：1、在澧水大橋上建立了橋位處山區(qū)峽谷風(fēng)環(huán)境的實(shí)時監(jiān)測系統(tǒng),對橋址峽谷風(fēng)場特性進(jìn)行了真實(shí)、有效的記錄。分析得到了包括平均風(fēng)速、風(fēng)向、風(fēng)速剖面、風(fēng)攻角等在內(nèi)的峽谷風(fēng)場平均風(fēng)特性以及湍流度、陣風(fēng)因子、湍流功率譜密度等在內(nèi)的脈動風(fēng)特性。并對各項(xiàng)特征參數(shù)的相關(guān)性進(jìn)行了擬合。澧水大橋橋位處風(fēng)場受山區(qū)峽谷地形的影響,其三維特性比較顯著。研究結(jié)果表明：由于澧水大橋峽谷呈彎曲狀,主要來流風(fēng)場并沒有發(fā)生穿流形成明顯的峽谷效應(yīng)；風(fēng)攻角范圍分布在-9°和+7°之間,波動較大；湍流度與規(guī)范中D類地表規(guī)定值接近。2、利用數(shù)值模擬技術(shù)與逆向工程軟件結(jié)合,建立了橋址處峽谷真實(shí)地形的大范圍CFD模型生成方法,對橋址峽谷地形風(fēng)場特性進(jìn)行了CFD數(shù)值模擬。得到了完整模擬真實(shí)地形的技術(shù)路線以及比較合理的入口邊界條件。研究表明單一的指數(shù)率風(fēng)剖面并不滿足峽谷地形風(fēng)速隨高度變化規(guī)律,風(fēng)攻角分布超出設(shè)計(jì)考慮范圍等結(jié)論,與實(shí)測結(jié)果形成對比。3、為了獲得具有普遍意義的峽谷風(fēng)場特性分布規(guī)律,建立了系列的簡易峽谷數(shù)值模型,分析了風(fēng)場分布規(guī)律與峽谷上下谷口寬度、坡度等參數(shù)的關(guān)系,并提出了擬合公式,可以作為此類地形橋址風(fēng)參數(shù)確定的參考。本文主要通過現(xiàn)場實(shí)測和數(shù)值模擬兩種研究方法,對澧水大橋橋位處山區(qū)峽谷風(fēng)場特性進(jìn)行研究。研究成果不僅對澧水大橋的正常運(yùn)營起到指導(dǎo)作用,對后續(xù)此類山區(qū)風(fēng)環(huán)境的研究工作也提供了參考。
[Abstract]:With the gradual implementation of the western strategy, more and more long-span flexible bridges will be built in the mountainous canyons of the central and western regions. In order to ensure the smooth construction and normal operation of such bridges, Accurate wind load input is a prerequisite for wind resistance design of long-span flexible bridges. However, the terrain of mountain canyon area is rugged and the environment is complex, so it is difficult to determine the parameters of wind field characteristics, and there is no detailed regulation on the wind field characteristics under the condition of canyon topography in the current bridge wind resistance code. Therefore, it is very necessary to study the wind field characteristics of mountain canyons. Based on the major project of the Ministry of Communications in the west of the Ministry of Communications, "Research on Monitoring and Simulation Technology of Wind and Rain effect of Super large Bridges", the characteristics of wind field at the location of Lishui Bridge are studied as follows: 1. A real-time monitoring system for the wind environment of the mountain canyon at the bridge site is established on the Lishui Bridge, and the characteristics of the canyon wind field at the bridge site are recorded truthfully and effectively. The average wind characteristics of canyon wind field, such as mean wind speed, wind direction, wind speed profile, wind attack angle, etc., as well as the fluctuating wind characteristics, such as turbulence degree, gust factor, turbulent power spectral density, etc., are obtained by analyzing the mean wind speed, wind direction, wind speed profile, wind attack angle and so on. The correlation of each characteristic parameter is fitted. The wind field at the bridge position of Lishui Bridge is affected by the terrain of mountain canyon, and its three-dimensional characteristics are remarkable. The results show that because the canyon of Lishui Bridge is curved, there is no obvious canyon effect in the main inflow wind field, and the wind attack angle is distributed between-9 擄and 7 擄, which fluctuates greatly. The turbulence degree is close to the specified value of Class D surface in the code. 2. Using the combination of numerical simulation technology and reverse engineering software, a large-scale CFD model generation method for the real terrain of the canyon at the bridge site is established. The CFD numerical simulation of the wind field characteristics of the canyon terrain at the bridge site is carried out. The technical route for simulating the real terrain and the reasonable entrance boundary conditions are obtained. The results show that the single exponential rate wind profile does not satisfy the conclusion that the wind speed varies with the height of the canyon terrain, and the distribution of wind attack angle exceeds the range considered in the design, which is compared with the measured results. 3, In order to obtain the characteristic distribution law of canyon wind field, a series of simple canyon numerical models are established, the relationship between the distribution law of wind field and the parameters such as the width and slope of the upper and lower valley mouth of the canyon is analyzed, and the fitting formula is put forward. It can be used as a reference for determining the wind parameters of this kind of topographic bridge site. In this paper, the wind field characteristics of mountain canyons at the bridge site of Lishui Bridge are studied by means of field measurement and numerical simulation. The research results not only play a guiding role in the normal operation of Lishui Bridge, but also provide a reference for the follow-up research work of this kind of mountain wind environment.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.59
[Abstract]:With the gradual implementation of the western strategy, more and more long-span flexible bridges will be built in the mountainous canyons of the central and western regions. In order to ensure the smooth construction and normal operation of such bridges, Accurate wind load input is a prerequisite for wind resistance design of long-span flexible bridges. However, the terrain of mountain canyon area is rugged and the environment is complex, so it is difficult to determine the parameters of wind field characteristics, and there is no detailed regulation on the wind field characteristics under the condition of canyon topography in the current bridge wind resistance code. Therefore, it is very necessary to study the wind field characteristics of mountain canyons. Based on the major project of the Ministry of Communications in the west of the Ministry of Communications, "Research on Monitoring and Simulation Technology of Wind and Rain effect of Super large Bridges", the characteristics of wind field at the location of Lishui Bridge are studied as follows: 1. A real-time monitoring system for the wind environment of the mountain canyon at the bridge site is established on the Lishui Bridge, and the characteristics of the canyon wind field at the bridge site are recorded truthfully and effectively. The average wind characteristics of canyon wind field, such as mean wind speed, wind direction, wind speed profile, wind attack angle, etc., as well as the fluctuating wind characteristics, such as turbulence degree, gust factor, turbulent power spectral density, etc., are obtained by analyzing the mean wind speed, wind direction, wind speed profile, wind attack angle and so on. The correlation of each characteristic parameter is fitted. The wind field at the bridge position of Lishui Bridge is affected by the terrain of mountain canyon, and its three-dimensional characteristics are remarkable. The results show that because the canyon of Lishui Bridge is curved, there is no obvious canyon effect in the main inflow wind field, and the wind attack angle is distributed between-9 擄and 7 擄, which fluctuates greatly. The turbulence degree is close to the specified value of Class D surface in the code. 2. Using the combination of numerical simulation technology and reverse engineering software, a large-scale CFD model generation method for the real terrain of the canyon at the bridge site is established. The CFD numerical simulation of the wind field characteristics of the canyon terrain at the bridge site is carried out. The technical route for simulating the real terrain and the reasonable entrance boundary conditions are obtained. The results show that the single exponential rate wind profile does not satisfy the conclusion that the wind speed varies with the height of the canyon terrain, and the distribution of wind attack angle exceeds the range considered in the design, which is compared with the measured results. 3, In order to obtain the characteristic distribution law of canyon wind field, a series of simple canyon numerical models are established, the relationship between the distribution law of wind field and the parameters such as the width and slope of the upper and lower valley mouth of the canyon is analyzed, and the fitting formula is put forward. It can be used as a reference for determining the wind parameters of this kind of topographic bridge site. In this paper, the wind field characteristics of mountain canyons at the bridge site of Lishui Bridge are studied by means of field measurement and numerical simulation. The research results not only play a guiding role in the normal operation of Lishui Bridge, but also provide a reference for the follow-up research work of this kind of mountain wind environment.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.59
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