【摘要】：隨著我國西部大開發(fā),促進(jìn)川、滇兩省跨區(qū)域聯(lián)動(dòng)發(fā)展的進(jìn)程,越來越多的大跨度橋梁被建設(shè)于西部復(fù)雜的山區(qū)峽谷之中;雖然大跨度橋梁對西部山區(qū)峽谷地區(qū)的大力發(fā)展具有重要促進(jìn)作用,但是很多橋梁建設(shè)地山高而谷深,特殊而又復(fù)雜的地理環(huán)境給大跨度橋梁抗風(fēng)研究帶來了諸多難題;即便橋梁結(jié)構(gòu)抗風(fēng)設(shè)計(jì)規(guī)范具有相應(yīng)的規(guī)定,但也只是對平原和沿海地區(qū)具有較高的參考價(jià)值,對我國西部這種復(fù)雜的峽谷地形參考意義不大,故而對山區(qū)峽谷地形的風(fēng)場特征深入研究就顯得尤為重要。本文以擬建的西香高速中一座位于四川省,西昌鹽源縣境內(nèi)的某大橋?yàn)檠芯勘尘?在橋位處,峽谷兩側(cè)分別架設(shè)一個(gè)美國YOUNG-81000型三維超聲風(fēng)速儀,對橋位處風(fēng)環(huán)境進(jìn)行持續(xù)的現(xiàn)場實(shí)測。通過實(shí)測數(shù)據(jù),對橋位處風(fēng)攻角、風(fēng)向角、湍流強(qiáng)度、積分尺度、功率譜進(jìn)行了系統(tǒng)分析。結(jié)果表明:橋位處風(fēng)速的整體分布情況為上午小而下午大,每天的大風(fēng)記錄都在10m/s以上,出現(xiàn)時(shí)間段為下午14時(shí)到17時(shí)之間。風(fēng)攻角主要集中在±5°之間,受橋位處復(fù)雜的地形影響風(fēng)攻角有部分突變。風(fēng)向來流集中在東南偏南向,與擬建橋軸線夾角接近90°。另一方面,根據(jù)計(jì)算流體力學(xué)(CFD)知識(shí),采用SST k-ω湍流模型,對峽谷區(qū)整體風(fēng)環(huán)境進(jìn)行數(shù)值模擬,根據(jù)風(fēng)向來流每隔30°劃分了十二個(gè)工況進(jìn)行分析。研究結(jié)果表明:風(fēng)速放大系數(shù)平均值為0.78;風(fēng)攻角主要分布在-2°到5.5°之間;受地形影響,部分工況下風(fēng)向角大于40°,橋位處可能存在斜風(fēng)作用。
[Abstract]:With the development of western China and the promotion of cross-regional linkage development between Sichuan and Yunnan provinces, more and more long-span bridges have been built in the complex mountain canyons in the western part of China. Although long-span bridges play an important role in promoting the development of mountain canyons in the western part of China, many bridges are constructed in high mountains and deep valleys, and the special and complex geographical environment brings many difficulties to the study of wind-resistance of long-span bridges. Even though the wind-resistant design code for bridge structures has corresponding regulations, it is of high reference value to the plain and coastal areas, and is of little significance to the complex canyon topography in the western part of China. Therefore, it is very important to study the wind field characteristics of mountain canyons. In this paper, a bridge located in Yanyuan County, Xichang County, Sichuan Province, is proposed to be built. In this paper, an American YOUNG-81000 type three-dimensional ultrasonic anemometer is set up on both sides of the bridge. Continuous field measurement of wind environment at bridge site is carried out. The wind attack angle, wind direction angle, turbulence intensity, integral scale and power spectrum at the bridge are systematically analyzed by the measured data. The results show that the overall distribution of wind speed at the bridge is small in the morning and large in the afternoon, the daily wind records are above 10m/s, and the time between 14:00 and 17:00. The angle of attack of wind is mainly between 鹵5 擄, and the angle of attack of wind has some abrupt changes due to the complex terrain at the bridge. The wind current is concentrated in the south-southeast direction, and the angle between the wind flow and the proposed bridge axis is close to 90 擄. On the other hand, according to the (CFD) knowledge of computational fluid dynamics and SST k- 蠅 turbulence model, the overall wind environment in the canyon is numerically simulated. Twelve conditions are analyzed according to the wind flow at 30 擄intervals. The results show that the average wind speed magnification factor is 0.78, the wind attack angle is mainly between -2 擄and 5.5 擄, and the wind direction angle is more than 40 擄under the influence of topography.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U442

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