發(fā)布時(shí)間：2018-08-24 11:31

【摘要】：科學(xué)技術(shù)的進(jìn)步和時(shí)代需求促使超高層建筑迅猛發(fā)展,中國(guó)現(xiàn)存和在建的超高層建筑數(shù)量呈逐年增加的趨勢(shì),約2020年左右,中國(guó)將成為全球范圍內(nèi)超高層建筑最多的國(guó)家。隨著超高層建筑的增多,一些又“瘦”又“高”具有明顯“豎井”的特點(diǎn)的超高中庭數(shù)量也呈逐年增加趨勢(shì),并受到了設(shè)計(jì)師和人們的一致認(rèn)可。然而,由于中庭空間高度較高且截面積較小,火災(zāi)時(shí)易形成煙囪效應(yīng),導(dǎo)致煙氣范圍迅速擴(kuò)大,因此如何設(shè)計(jì)超瘦高中庭的煙氣控制系統(tǒng)以保證超瘦高中庭的消防安全是研究人員不得不面對(duì)的新挑戰(zhàn)。本文根據(jù)超瘦高中庭的空間特征,分析超瘦高中庭建筑的火災(zāi)特點(diǎn)和影響煙氣運(yùn)動(dòng)的相關(guān)因素,并針對(duì)影響中庭自然排煙的因素,基于相關(guān)理論公式和FDS火災(zāi)模擬軟件,采用理論和數(shù)值模擬結(jié)合的方法得到了超瘦高中庭能夠進(jìn)行自然排煙的臨界條件。由中庭火災(zāi)煙氣蔓延規(guī)律定義了羽流臨界區(qū)高度,基于羽流質(zhì)量變化規(guī)律分析及中性面模型,對(duì)超瘦高中庭羽流進(jìn)行了研究,且與FDS數(shù)值模擬結(jié)果進(jìn)行了對(duì)比驗(yàn)證。分析了超瘦高中庭分別在單獨(dú)熱壓情況下以及外界風(fēng)與熱壓同時(shí)作用下自然排煙的臨界條件,并研究了超瘦高中庭線性溫度分層和區(qū)域分層情況下對(duì)自然排煙效果的影響。
[Abstract]:The progress of science and technology and the needs of the times promote the rapid development of super-high-rise buildings. The number of existing and ongoing super-tall buildings in China is increasing year by year. About 2020, China will become the largest country with super-tall buildings in the world. With the increase of super-tall buildings, the number of ultra-high atrium which is "thin" and "high" has been increasing year by year, and has been accepted by designers and people. However, because of the high height of atrium space and the smaller cross section, the chimney effect is easy to form in the fire, which results in the rapid expansion of the smoke range. Therefore, how to design the smoke control system of super thin atrium to ensure the fire safety of super thin atrium is a new challenge that researchers have to face. According to the spatial characteristics of super thin atrium, this paper analyzes the fire characteristics of super thin atrium building and the related factors affecting smoke movement. Aiming at the factors that affect the natural smoke emission of the atrium, based on the relevant theoretical formula and FDS fire simulation software, this paper analyzes the fire characteristics of the super thin atrium building and the related factors affecting the smoke movement of the atrium. The critical conditions for natural smoke emission from super thin atrium were obtained by combining theory and numerical simulation. The height of the plume critical zone is defined by the smoke spread law of atrium fire. Based on the analysis of the plume mass variation law and the neutral surface model, the plume in the super-thin atrium is studied, and the results are compared with the results of FDS numerical simulation. In this paper, the critical conditions of natural smoke exhaust in super thin atrium under single hot pressing and the simultaneous action of external wind and hot pressing were analyzed, and the effects of linear temperature stratification and regional stratification on the natural smoke exhaust were studied.
【學(xué)位授予單位】：沈陽(yáng)航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU972.4

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