【摘要】：隨著橋梁技術(shù)的發(fā)展，跨越復(fù)雜地形的大跨度橋梁不斷涌現(xiàn)，受到復(fù)雜地形的干擾，抗風(fēng)設(shè)計(jì)規(guī)范均已不再適用。本文基于湖南省矮寨大橋橋址區(qū)的峽谷地形為工程背景，采用現(xiàn)場實(shí)測和數(shù)值模擬相結(jié)合的方法，研究山區(qū)峽谷平均風(fēng)速特性，總結(jié)峽谷平均風(fēng)場特性變化規(guī)律。主要研究內(nèi)容包括： （1）基于MATLAB軟件編程功能，對矮寨大橋橋位區(qū)現(xiàn)場實(shí)測數(shù)據(jù)進(jìn)行了讀取與數(shù)值處理；推導(dǎo)了三維風(fēng)速傳感器的風(fēng)軸坐標(biāo)轉(zhuǎn)換；分析了兩次強(qiáng)風(fēng)記錄的平均風(fēng)特性，如瞬時風(fēng)速、脈動風(fēng)速、10分鐘平均風(fēng)速、風(fēng)玫瑰圖、風(fēng)攻角等參數(shù)。 （2）采用國家科學(xué)數(shù)據(jù)服務(wù)平臺獲取了橋位附近較大范圍內(nèi)的地形高程數(shù)據(jù)，，借助Global Mapper和Civil3D進(jìn)行數(shù)據(jù)傳遞，獲得橋位地形高程點(diǎn)云；利用逆向工程軟件NX Imageware的曲面擬合功能擬合橋位地形曲面；根據(jù)六面體網(wǎng)格劃分方法，減小了網(wǎng)格的數(shù)量及計(jì)算的時間；編寫了UDF邊界輸入程序，進(jìn)行了八個不同來流風(fēng)向的工況分析。 通過兩次強(qiáng)風(fēng)實(shí)測記錄與數(shù)值模擬的風(fēng)剖面指數(shù)對比，驗(yàn)證了本文的數(shù)值模擬是一種建模方便、精度較高的方法。同時證明了峽谷風(fēng)的來流風(fēng)向不同，峽谷風(fēng)特性的地表粗糙系數(shù)、風(fēng)攻角以及沿橋軸向的風(fēng)速分布等參數(shù)明顯不同。
[Abstract]:With the development of bridge technology, long-span bridges spanning complex terrain are emerging constantly, and the wind resistant design code is no longer applicable to the disturbance of complex terrain. Based on the engineering background of the canyon topography in the bridge area of the Paizhai Bridge in Hunan Province, this paper studies the characteristics of the mean wind speed in mountain canyons and summarizes the variation law of the average wind field characteristics of the canyons by using the method of field measurement and numerical simulation. The main research contents are as follows: (1) based on the programming function of MATLAB software, the field measured data in the bridge area of Aizhai Bridge are read and processed, and the coordinate transformation of the wind axis of the three-dimensional wind speed sensor is deduced. The average wind characteristics of two strong wind records are analyzed, such as instantaneous wind speed, pulsating wind speed, 10-minute mean wind speed, wind rose chart. (2) using the national scientific data service platform to obtain the topographic elevation data in a large area near the bridge, and to transfer the data by means of Global Mapper and Civil3D to obtain the topographic elevation point cloud of the bridge position; The surface fitting function of reverse engineering software NX Imageware is used to fit the topographic surface of bridge position. According to the method of hexahedron mesh generation, the number of meshes and the time of calculation are reduced, and the UDF boundary input program is written. The operating conditions of eight different flow directions are analyzed. The comparison of wind profile exponents between the measured records of two strong winds and the numerical simulation shows that the numerical simulation in this paper is a convenient and accurate method. It is also proved that the surface roughness coefficient, wind attack angle and wind velocity distribution along the bridge axis of canyon wind are different.
【學(xué)位授予單位】：湖南科技大學(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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