本文選題：中空玻璃 + 火災環(huán)境��； 參考：《中國科學技術大學》2015年碩士論文

【摘要】：普通單層玻璃在建筑中的應用起到了采光、通風和擴大視野的作用,但保溫性能較差；雙層玻璃的出現(xiàn)有效地解決了保溫性能的問題,但易吸收空氣中的水蒸氣等而結(jié)露,影響視野。由兩塊玻璃板通過鋁隔條用密封膠密封制成的中空玻璃,既彌補了單層玻璃隔熱差、散熱快的缺點,還能將雙層玻璃的保暖隔熱的優(yōu)勢利用,具有良好的保溫隔熱以及防結(jié)露性能。但是中空玻璃在發(fā)生火災時存在破裂、脫落的危險性,會加速火災蔓延并威脅人員逃生。因此中空玻璃在火災環(huán)境下的破裂、脫落行為及其耐火性能的研究是建筑火災安全的重要課題之一。 國內(nèi)外學者已經(jīng)對中空玻璃在其破裂行為方面進行了研究,并得出在特定實驗條件下中空玻璃具有的破裂行為規(guī)律和其他定性和定量的結(jié)論。但是這些研究中尚未涉及到安裝方式對中空玻璃的影響。 本文采用了實驗的方法從不同安裝方式下的中空玻璃熱響應和不同空氣夾層厚度下的中空玻璃熱響應這兩個方面重點研究了中空玻璃在火災場景下的破裂行為規(guī)律,并探討了工程應用中安裝方式和中空玻璃厚度的推薦選擇。 本研究共設計了32組實驗,詳細分析了中空玻璃向火面中心點處的熱通量、火源熱釋放速率、中空玻璃表面溫度分布、向火面和背火面兩片玻璃的破裂時間、首次開裂位置、裂紋形態(tài)以及玻璃脫落情況等參數(shù)。定義玻璃長度為L,中點為零點,則邊長區(qū)域可表示為[-0.5L,0.5L]。實驗結(jié)果表明25kW/m2的熱通量是使得三種中空玻璃破裂并脫落的最小熱通量；向火面玻璃的首次起裂位置都位于玻璃的被遮蔽區(qū)域,而且均位于[-0.25L,0.25L]的范圍內(nèi)；四邊遮蔽工況下向火面玻璃首次破裂平均時間少于另外兩種安裝方式,但其向火面玻璃與背火面玻璃的脫落比例低于另外兩種安裝方式,從而保持了玻璃具備更好的完整性,減少新鮮空氣的進入,減慢火勢發(fā)展,且左右垂直遮蔽的安裝方式比上下水平遮蔽更容易脫落；向火面玻璃的破裂和脫落對背火面玻璃的破裂具有較為顯著的影響。 進一步研究了特定遮蔽方式下三種不同空氣夾層厚度的中空玻璃在火災場景下的熱響應,對向火面和背火面玻璃首次開裂時間及脫落面積進行了詳細的對比分析。結(jié)果表明本文實驗條件下,四邊遮蔽、上下水平遮蔽和左右垂直遮蔽的安裝方式時,12mm、6mm和12mm空氣夾層厚度的中空玻璃分別具有比另外兩種厚度的中空玻璃更長的耐火時間和更小的脫落比例。
[Abstract]:The application of common monolayer glass in building has played the role of daylighting, ventilation and broadening the field of vision, but the insulation performance is poor. The appearance of double layer glass has effectively solved the problem of insulation performance, but it is easy to absorb water vapor in the air and to form dew. Influence vision. The hollow glass, which is made of two glass panels sealed with sealant through aluminum straps, not only makes up for the shortcomings of poor heat insulation and fast heat dissipation of single layer glass, but also makes use of the advantage of double layer glass to keep warm and heat insulating. It has good thermal insulation and anti-condensation performance. But insulating glass is dangerous to break and fall off in case of fire, which accelerates fire spread and threatens personnel to escape. Therefore, the study of rupture, shedding behavior and fire resistance of insulating glass in fire environment is one of the most important problems in building fire safety. Scholars at home and abroad have studied the fracture behavior of insulating glass and obtained the fracture behavior of insulating glass under certain experimental conditions and other qualitative and quantitative conclusions. However, the effect of installation mode on insulating glass has not been discussed in these studies. In this paper, the thermal response of hollow glass under different installation modes and the thermal response of hollow glass with different thickness of air interlayer are studied by means of experiments. The rupture behavior of hollow glass in fire scene is mainly studied. The recommended selection of installation mode and thickness of insulating glass in engineering application is also discussed. In this study, 32 groups of experiments were designed. The heat flux, the heat release rate of the fire source, the surface temperature distribution of the hollow glass, the rupture time and the first crack position of the glass toward the center of the fire surface and the back surface were analyzed in detail. Crack shape and glass shedding and other parameters. If the length of glass is defined as L and the midpoint is zero, the region of side length can be expressed as [-0.5L]. The experimental results show that the heat flux of 25kW/m2 is the minimum heat flux that causes the three kinds of hollow glass to break and fall off, and the first initiation position of the glass is located in the shaded area of the glass, and all of them are located in the range of [-0.25L ~ 0.25L]. The average time for the first rupture of the flame-facing glass under the four-sided shielding condition is less than that of the other two installation modes, but the ratio of the flare glass to the backfire glass is lower than that of the other two installation modes, so that the glass has better integrity. The installation of vertical shading is easier to fall off than horizontal shielding, and the rupture and shedding of flame-facing glass has a significant effect on the rupture of backfire glass. The thermal response of three kinds of insulating glass with different thickness of air interlayer under the specific shielding mode was studied in the fire scene. The first cracking time and the falling off area of the glass on the fire surface and the back fire surface were compared and analyzed in detail. The results show that under the experimental conditions, the four edges are shaded, The insulating glass with the thickness of 12mm and 6mm and the thickness of 12mm air interlayer has longer fireproof time and smaller ratio of falling off than that of the other two kinds of insulating glass.
【學位授予單位】：中國科學技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ171.727

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