本文關(guān)鍵詞： 粗糙壁面 鈍體繞流 CFD模擬 風(fēng)洞試驗(yàn)　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：高層建筑需要考慮風(fēng)荷載作用,國(guó)內(nèi)外對(duì)高層建筑風(fēng)荷載的研究對(duì)象主要為外形規(guī)則的建筑,對(duì)表面帶有裝飾條或因建筑造型需要而導(dǎo)致壁面粗糙的高層建筑結(jié)構(gòu)的風(fēng)荷載特性研究較少�，F(xiàn)代建筑為了功能以及審美需求,往往表面做成凹凸起伏等復(fù)雜形狀,導(dǎo)致風(fēng)荷載特性的差別較大,因此有必要對(duì)高層建筑風(fēng)荷載研究中存在的粗糙壁面情況展開分析與討論。本文具體工作和結(jié)論如下:(1)在概述風(fēng)工程數(shù)值模擬的基本理論基礎(chǔ)上,介紹了高層建筑數(shù)值模擬的標(biāo)準(zhǔn)模型CAARC模型,探討了數(shù)值模擬基本參數(shù)的選取和設(shè)置。主要對(duì)網(wǎng)格獨(dú)立性進(jìn)行了驗(yàn)證。(2)進(jìn)行二維數(shù)值風(fēng)洞模擬,著重對(duì)比了截面長(zhǎng)寬比、壁面凸起的高度和間距等參數(shù)對(duì)氣動(dòng)力、風(fēng)壓分布和流場(chǎng)的影響。(3)選取一實(shí)際建筑進(jìn)行三維數(shù)值模擬,對(duì)比風(fēng)洞試驗(yàn)結(jié)果。初步探討粗糙壁面高層建筑的風(fēng)荷載特性。(4)計(jì)算結(jié)果表明,本文采用的結(jié)構(gòu)當(dāng)來(lái)流方向正對(duì)迎風(fēng)面時(shí),迎風(fēng)面上的凹凸會(huì)對(duì)風(fēng)起到匯聚作用,使其風(fēng)壓系數(shù)增大;在側(cè)面凹凸區(qū)內(nèi)會(huì)形成較小的漩渦,在凹凸區(qū)外氣流加速,流速梯度加大,風(fēng)壓系數(shù)略微減小;在背風(fēng)面,粗糙的壁面產(chǎn)生的漩渦范圍較大,且回流速度小于光滑壁面相應(yīng)的速度,風(fēng)壓系數(shù)絕對(duì)值表現(xiàn)為減小。
[Abstract]:High-rise buildings need to consider the action of wind load. The research object of wind load of high-rise buildings at home and abroad is the building with regular shape. There are few studies on wind load characteristics of high-rise building structures with decorative strips or rough walls caused by architectural modeling. For the purpose of function and aesthetic demand, modern buildings often make complex shapes such as ups and downs. So it is necessary to analyze and discuss the rough wall in the wind load research of high-rise building. The concrete work and conclusion are as follows: 1) based on the basic theory of wind engineering numerical simulation, The standard model CAARC model for numerical simulation of high-rise buildings is introduced, and the selection and setting of basic parameters of numerical simulation are discussed. The influence of the height and spacing of the wall bulge on aerodynamic force, wind pressure distribution and flow field. Comparing with the results of wind tunnel test, the calculation results of wind load characteristics of tall buildings with rough walls show that when the direction of the incoming current is positive to the upwind surface, the concave and convex on the upwind surface will converge on the wind. The wind pressure coefficient is increased, a smaller swirl is formed in the lateral concave and convex region, the velocity gradient increases and the wind pressure coefficient decreases slightly outside the concave and convex zone, and on the leeward surface, the swirl range of the rough wall surface is larger. The reflux velocity is smaller than that of smooth wall, and the absolute value of wind pressure coefficient decreases.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU973.213

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