中空玻璃受热破裂行为规律研究
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摘要
研究了单层玻璃厚度为6mm,两块玻璃间距为6mm的中空玻璃的受热响应规律,分析了向火面和背火面玻璃板的表面温度、玻璃板向火面中心点处的热通量、两块玻璃的破裂时间、裂纹形态以及玻璃脱落情况等。定义玻璃边长区域范围为[-0.5L,0.5L],则玻璃首次起裂点均位于被遮蔽边上,且在[-0.25L,0.25L]的范围内。进一步研究了遮蔽方式对中空玻璃破裂行为的影响,在本实验条件下,四边遮蔽的向火面玻璃最易破裂,且左右垂直遮蔽比上下水平遮蔽情况下脱落程度严重。
The thermal response and fracture behavior of hollow glass,which consists of two pieces of 6 mm thickness glass plate and 6mm air spacing,were studied in this work.The surface temperatures of the exposed and back side of the hollow glass,heat flux at the center of the exposed side,the breaking time of two panes,the glass crack morphology and the fall-out proportion were measured and analyzed.The edge length of glass was defined as the scope of[-0.5L,0.5L],then the first crack position of the two pieces of glass initiated in the range of[-0.25 L,0.25L]at the edge of the glass.Moreover,the glass pane exposed to fire with four edges covered is the easiest mode to crack,and the fall-out proportion with vertical shaded is greater than that of horizontal shaded one under these experimental conditions.
The thermal response and fracture behavior of hollow glass,which consists of two pieces of 6 mm thickness glass plate and 6mm air spacing,were studied in this work.The surface temperatures of the exposed and back side of the hollow glass,heat flux at the center of the exposed side,the breaking time of two panes,the glass crack morphology and the fall-out proportion were measured and analyzed.The edge length of glass was defined as the scope of[-0.5L,0.5L],then the first crack position of the two pieces of glass initiated in the range of[-0.25 L,0.25L]at the edge of the glass.Moreover,the glass pane exposed to fire with four edges covered is the easiest mode to crack,and the fall-out proportion with vertical shaded is greater than that of horizontal shaded one under these experimental conditions.
引文
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[2]Hassani SK,et al.An experimental investigation into the behaviour of glazing in enclosure fire[J].Journal of Applied Fire Science,1994,4(4):303-323.
[3]Shields T,et al.The behavior of double glazing in an enclosure fire[J].Journal of Applied Fire Science,1997,7(3):267-286.
[4]Cuzzillo BR,Pagni PJ.Thermal breakage of double-pane glazing by fire[J].Journal of Fire Protection Engineering,1998,9(1):1-11.
[5]Joshi A,Pagni PJ.Fire-induced thermal fields in window glass.I—theory[J].Fire Safety Journal,1994,22(1):25-43.
[6]Pagni P,Joshi A.Glass breaking in fires[A].Fire Safety Science-Proceedings of the Third International Symposium[C],Routledge,1991:791-802.
[7]Shields J,et al.Behaviour of double glazing in corner fires[J].Fire technology,2005,41(1):37-65.
[8]Huizinga R.Influence of the performance of triple and double glazing on the fire development in a dwelling[D].Eindhoven University of Technology,2012.
[9]Ni Z,et al.Experimental study on fire performance of double-skin glass facades[J].Journal of Fire Sciences,2012,30(5):457-472.
[10]黄春勇.中空玻璃的热工性能研究及其在住宅建筑上适用性分析[D].重庆大学,2008.
[11]童树庭,冯晓云.中空玻璃的传热特性及其影响因素[J].建筑材料学报,2004,7(1):52-57.