本文關(guān)鍵詞： 平屋蓋 風(fēng)洞試驗(yàn) 錐狀渦 風(fēng)壓譜模型　出處：《土木工程學(xué)報(bào)》2014年01期 　論文類型：期刊論文

【摘要】：錐狀渦是大跨度平屋蓋表面在斜風(fēng)向來流作用下形成的一種特征湍流形式,相對于來流垂直于檐口時(shí)所形成的柱狀渦而言,錐狀渦的作用形態(tài)更為復(fù)雜,破壞性更強(qiáng)。基于風(fēng)洞測壓試驗(yàn),對錐狀渦作用下平屋蓋表面不同位置處的脈動(dòng)風(fēng)壓譜特性進(jìn)行研究,探討脈動(dòng)風(fēng)壓譜形狀與分離、再附、漩渦脫落等流動(dòng)現(xiàn)象之間的聯(lián)系,歸納出四類典型的脈動(dòng)風(fēng)壓譜形式;在此基礎(chǔ)上,提出由來流湍流影響項(xiàng)和特征湍流影響項(xiàng)組成的脈動(dòng)風(fēng)壓譜多項(xiàng)式模型,并通過引入權(quán)重系數(shù)來反映不同湍流影響項(xiàng)的貢獻(xiàn)。研究結(jié)果表明,通過權(quán)重系數(shù)的分布可以劃分流場影響區(qū)域,具有一定的物理意義。同時(shí)考察脈動(dòng)風(fēng)壓的空間相關(guān)性,研究表明,在錐形渦作用使得屋蓋表面脈動(dòng)風(fēng)壓相關(guān)性強(qiáng)于來流脈動(dòng)風(fēng)速,相干函數(shù)用指數(shù)衰減函數(shù)表示,衰減系數(shù)可取2.5。最后,通過風(fēng)振響應(yīng)分析結(jié)果來比較風(fēng)壓譜模型對風(fēng)振響應(yīng)結(jié)果的影響,結(jié)果表明,擬定常假設(shè)低估了結(jié)構(gòu)的脈動(dòng)響應(yīng),而基于文中的簡化風(fēng)壓譜模型得到的風(fēng)振響應(yīng)結(jié)果與風(fēng)洞試驗(yàn)結(jié)果吻合較好。研究為進(jìn)一步建立統(tǒng)一的屋蓋脈動(dòng)風(fēng)壓譜模型奠定了基礎(chǔ)。
[Abstract]:Conical vortex is a characteristic turbulent form formed on the surface of a large span flat roof under the action of oblique wind flow. Compared with the columnar vortex formed when the incoming flow is perpendicular to the cornice, the action pattern of the conical vortex is more complicated than that of the column vortex formed when the flow is perpendicular to the cornice. On the basis of wind tunnel pressure measurement test, the characteristics of fluctuating wind pressure spectrum at different positions on the surface of flat roof under the action of conical vortex are studied, and the relationship between the shape of fluctuating wind pressure spectrum and flow phenomena such as separation, reattachment and vortex shedding is discussed. Four typical types of fluctuating wind pressure spectrum are summarized, and a polynomial model of pulsating wind pressure spectrum is proposed, which is composed of the turbulent influence term and the characteristic turbulence influence term. The results show that the distribution of the weight coefficients can be used to divide the affected areas of the flow field, which is of certain physical significance. At the same time, the spatial correlation of the pulsating wind pressure is investigated. The results show that the correlation of fluctuating wind pressure on the roof surface is stronger than that of the incoming wind velocity under the action of conical vortex. The coherence function is expressed by exponential attenuation function, and the attenuation coefficient is 2.5. Finally, The effect of wind pressure spectrum model on wind-induced vibration response is compared by the results of wind vibration response analysis. The results show that the proposed assumptions underestimate the fluctuating response of the structure. The results of wind vibration response based on the simplified wind pressure spectrum model in this paper are in good agreement with the wind tunnel test results. The study lays a foundation for the further establishment of a unified roof fluctuating wind pressure spectrum model.
【作者單位】： 哈爾濱工業(yè)大學(xué);
【基金】：國家自然科學(xué)基金面上項(xiàng)目(51278160,50908068)、國家自然科學(xué)基金重大研究計(jì)劃集成項(xiàng)目(91215302) 中國博士后科學(xué)基金(20110491079)
【分類號】：TU312.1
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本文編號：1511926