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  本文關鍵詞：復雜山地風場及角鋼輸電塔風荷載數(shù)值模擬研究　出處：《合肥工業(yè)大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 數(shù)值模擬 復雜地形 平衡大氣邊界層 風載體型系數(shù) 風荷載標準值

【摘要】：數(shù)值模擬是掌握山地風場詳細信息的有力手段,可以為建筑結(jié)構(gòu)抗風分析提供資料。建筑結(jié)構(gòu)荷載規(guī)范已經(jīng)就典型山體狀況的風荷載進行了規(guī)定。鑒于復雜山地地形更加多變,復雜地形風場不能依靠典型山體風場的規(guī)定進行計算。因此,為進一步加強對復雜地形風場的了解,彌補建筑結(jié)構(gòu)荷載規(guī)范的不足,有必要進行復雜地形風場數(shù)值模擬。本文首先通過數(shù)值模擬獲得了平衡大氣邊界條件,確定了各種場地類型下的風場參數(shù)獲取方法,接著通過數(shù)字高程數(shù)據(jù)建立三維復雜山地地形模型,利用FLUENT針對湍流求解的雷諾平均法,實現(xiàn)了復雜地形風場的數(shù)值模擬,分析了不同類型風場中考慮復雜地形影響后的風速比及風向角變化情況,同時計算得到了不同風向角下研究位置處的風速剖面。研究結(jié)果表明,同一種場地下風速比及風向不受入口來流風速的改變影響,不同場地下兩者取值不同,其中風速比差別均在12%以上,風向差別更大,達到了40%。通過UG及GAMBIT建模軟件建立了窄基角鋼輸電塔的整體模型,研究了窄基角鋼輸電塔風荷載體型系數(shù)隨不同參考風速、來流風向的變化情況,對考慮復雜地形影響后的輸電塔風荷載標準值與規(guī)范值進行了對比。研究結(jié)果表明,體型系數(shù)的取值幾乎不受來流參考風速的影響,輸電塔塔身段順與垂直線路方向的體型系數(shù)隨風向角均是先增大后減小,橫擔體型系數(shù)變化基本與塔身變化一致,規(guī)范規(guī)定的體型系數(shù)比模擬值至少小于20%。在某些風向角下,由于地形對風速的加速效應及規(guī)范的體型系數(shù)取值偏低等問題,復雜地形風場下風荷載標準值比規(guī)范取值大接近一倍,此結(jié)果對復雜地形輸電塔風荷載的確定具有參考價值。
[Abstract]:The numerical simulation is to master the mountain wind field detailed information of the powerful means, can provide the information for wind resistance of building structure analysis. Building structure has been carried out on the provisions of the typical mountain wind load conditions. In view of the complicated terrain more changeable, complex terrain can not rely on the provisions of the typical mountain wind field is calculated. Therefore, for to further strengthen the understanding of complex terrain, compensate for the lack of code for the design of building structures, it is necessary to simulate the complex terrain wind field. This paper has been numerically simulated by equilibrium atmosphere boundary conditions, wind field parameters of various site types were determined under the acquisition method, and then through the digital elevation data to establish a three-dimensional complex terrain model by using the method of FLUENT, the Reynolds averaged turbulence for solving the complex terrain, numerical simulation of wind field, wind field analysis of the different types of senior high school entrance examination The wind speed ratio and considering effect of complex terrain after the wind direction changes, and calculate the velocity profile under different wind angles of position. The results show that changing the effect of one kind of wind speed and wind direction than the ground from the entrance flow velocity, different ground two different values, which are in the different wind speed ratio more than 12% of the wind, the greater the difference reached 40%., establish the overall model of the narrow base angle of transmission tower by UG and GAMBIT software, the narrow base angle of transmission tower wind load shape coefficient with different reference wind speed of change of flow direction, the transmission tower wind load standard value after considering the influence of complex terrain and the standard values were compared. The results show that the shape coefficient is almost not affected by the current wind speed, transmission tower body shape coefficient and vertical wind along the direction of the line to the angle is Increased first and then decreased, crossarm shape coefficient changes consistent with the change of tower body, shape coefficient of specification than analog value at less than 20%. in some wind direction, due to the problem of shape coefficient of low wind speed and acceleration effect of topography on complex terrain specification, wind load standard value than the standard value close to as the results to determine the complex terrain of wind load on transmission tower has reference value.

【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75

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