【摘要】：干煤棚結(jié)構(gòu)一般采用輕質(zhì)屋面體系,是一種典型的風(fēng)敏感結(jié)構(gòu)。因此,風(fēng)荷載是控制結(jié)構(gòu)設(shè)計的主要側(cè)向荷載之一,是進行結(jié)構(gòu)設(shè)計不可忽視的問題。本文對兩個矢跨比相同而分別在端截面采用開口形式和采用半球形網(wǎng)殼封閉形式的干煤棚(柱面和球面網(wǎng)殼組合式干煤棚)進行了剛性模型風(fēng)洞測壓試驗,對干煤棚結(jié)構(gòu)表面的平均風(fēng)壓的分布特征、極值風(fēng)壓系數(shù)隨風(fēng)向角的變化以及周邊的干擾效應(yīng)進行了研究。同時,就端部開口及端部封閉對風(fēng)荷載分布的影響進行了比較和分析。研究發(fā)現(xiàn),端部半球形封閉使得干煤棚整體結(jié)構(gòu)轉(zhuǎn)接過渡自然,表面不存在尖銳棱角,不會出現(xiàn)大的旋渦脫落,可有效減小干煤棚邊緣處20%~40%的平均風(fēng)荷載,其結(jié)果可以供設(shè)計同類工程修建或擴建時參考。
[Abstract]:Dry coal shed structure is a typical wind-sensitive structure because of its light roof system. Therefore, wind load is one of the main lateral loads to control structural design, and it is a problem that can not be ignored in structural design. In this paper, the rigid model wind tunnel pressure test of the dry coal shed (cylindrical and spherical reticulated shell composite dry coal shed) with the same rise-span ratio at the end section and the closed form of hemispherical reticulated shell is carried out. The distribution characteristics of the mean wind pressure on the surface of the dry coal shed, the variation of the extreme wind pressure coefficient with the wind direction angle and the interference effect of the surrounding area are studied. At the same time, the influence of end opening and end closure on wind load distribution is compared and analyzed. It is found that the end hemispherical closure makes the whole structure of dry coal shed transfer naturally, the surface does not have sharp edges and corners, and there is no large vortex shedding, which can effectively reduce the average wind load of 20% ~ 40% at the edge of dry coal shed. The results can be used as reference for the construction or expansion of similar projects.
【作者單位】： 同濟大學(xué)土木工程防災(zāi)國家級重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51178352,51378396)
【分類號】：TU312.1
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本文編號：2438475