【摘要】：為研究地表粗糙度對山區(qū)峽谷地形橋址區(qū)風(fēng)環(huán)境的影響,通過計算流體力學(xué)數(shù)值模擬的方法,對不同粗糙度下理想峽谷與真實峽谷模型中主梁跨中位置的風(fēng)剖面進(jìn)行了研究。通過理想模型的計算分析,確定了不同風(fēng)向角下主梁跨中風(fēng)剖面隨粗糙度變化的一般規(guī)律,結(jié)合對峽谷內(nèi)流場特點(diǎn)的分析,揭示了粗糙度對峽谷內(nèi)風(fēng)速造成影響的原因,并在真實地形模型中進(jìn)行了驗證,根據(jù)地表種類細(xì)化了粗糙度設(shè)置方案。研究表明,在峽谷地形條件下,粗糙度對風(fēng)速的影響與常規(guī)地形有明顯差異,在主梁高度處,隨著粗糙度的增加,主梁跨中風(fēng)速可能會有不同程度的增加。研究結(jié)論為山區(qū)峽谷地形處橋梁設(shè)計風(fēng)速確定提供了依據(jù)。
[Abstract]:In order to study the influence of surface roughness on the wind environment in the mountain canyon topographic bridge site, the wind profile of the midspan position of the main girder in the ideal canyon and the real canyon model under different roughness was studied by means of numerical simulation of computational fluid dynamics (CFD). Through the calculation and analysis of the ideal model, the general law of the variation of the stroke section of the main girder span with the roughness under different wind direction angles is determined. Combined with the analysis of the characteristics of the flow field in the canyon, the cause of the influence of the roughness on the wind speed in the canyon is revealed. It is verified in the real terrain model, and the roughness setting scheme is refined according to the surface type. The results show that under the condition of canyon topography, the influence of roughness on wind speed is obviously different from that of conventional terrain. At the height of the main girder, the wind speed in the middle of the main girder may increase to some extent with the increase of the roughness. The results provide a basis for determining the design wind speed of bridges in mountain canyons.
【作者單位】： 西南交通大學(xué)橋梁工程系;
【基金】：國家自然科學(xué)基金項目(U1334201) 交通運(yùn)輸部建設(shè)科技計劃項目(2014318800240) 四川省創(chuàng)新團(tuán)隊項目(2015TD0004)
【分類號】：U442.59
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本文編號：2252222