装配式保温混凝土空心剪力墙结构竖向接缝热桥效应研究
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摘要
装配式玻化微珠保温混凝土空心剪力墙结构竖向接缝会产生热桥效应。采用辅助热箱-热流计法对5片墙体的竖向接缝及其附近区域的热流密度、温度分布及传热系数进行测试和计算,研究了接缝宽度、孔洞填充保温材料、接缝设置保温层等条件对墙体热桥效应的影响。试验结果表明:空心孔洞填充聚氨酯保温材料可以使墙体的加权平均传热系数降低32.8%;接缝宽度由200 mm增大到250 mm时,热桥影响范围由3～7 cm增大到6～9.2 cm,但是接缝部位设置50 mm厚保温板可以消除热桥效应,使墙体的加权平均传热系数降低16%～18%;采用合理设计的装配式玻化微珠保温混凝土空心剪力墙结构能够适用于夏热冬冷地区的居住建筑,并满足相应的建筑节能设计标准。
Thermal bridge effects inevitably generated in the vertical joints of precast glazed hollow beads insulation concrete hollow shear wall structures.The heat fluxes,temperature distributions and the heat transfer coefficients at the vertical joints and its affected areas of 5 different wall specimens had been tested and calculated by auxiliary hot box-heat flow meter method,and some influence factors,such as the width of vertical joint,the hollow holes filled with thermal insulation material and the vertical joints covered with insulation board,on the thermal bridge effect in the wall had been researched.The experiment result shows that the hollow holes filled polyurethane insulation material could reduced the weighted average of heat transfer coefficient of wall by 32.8%.And when the width of thermal bridge increased from 200 mm to 250 mm,the affected range caused by thermal bridge correspondingly increased from 3～7 cm to 6～9.2 cm.Whereas the thermal bridge effect was eliminated by covering 50 mm XPS insulation board,which also decreased the wall′s weighted average of heat transfer coefficient by 16%～18%.The precast glazed hollow beads insulation concrete hollow shear wall structure with reasonable design would be applicable to residential buildings in hot-summer and cold-winter zones,and met building energy efficiency design standard.
Thermal bridge effects inevitably generated in the vertical joints of precast glazed hollow beads insulation concrete hollow shear wall structures.The heat fluxes,temperature distributions and the heat transfer coefficients at the vertical joints and its affected areas of 5 different wall specimens had been tested and calculated by auxiliary hot box-heat flow meter method,and some influence factors,such as the width of vertical joint,the hollow holes filled with thermal insulation material and the vertical joints covered with insulation board,on the thermal bridge effect in the wall had been researched.The experiment result shows that the hollow holes filled polyurethane insulation material could reduced the weighted average of heat transfer coefficient of wall by 32.8%.And when the width of thermal bridge increased from 200 mm to 250 mm,the affected range caused by thermal bridge correspondingly increased from 3～7 cm to 6～9.2 cm.Whereas the thermal bridge effect was eliminated by covering 50 mm XPS insulation board,which also decreased the wall′s weighted average of heat transfer coefficient by 16%～18%.The precast glazed hollow beads insulation concrete hollow shear wall structure with reasonable design would be applicable to residential buildings in hot-summer and cold-winter zones,and met building energy efficiency design standard.
引文
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[3]张泽平.玻化微珠保温混凝土及其结构的基本性能试验与理论分析研究[D].太原:太原理工大学,2009.
[4]常晋,刘元珍,冯文党.玻化微珠保温混凝土中高剪力墙承载力试验及分析[J].建筑科学,2015,31(11):50-56.
[5]张玉.保温承重混凝土梁、柱和节点的力学性能研究[D].太原:太原理工大学,2016.
[6]刘建洋.玻化微珠保温混凝土空心剪力墙抗震性能试验研究[D].太原:太原理工大学,2016.
[7]常晋.玻化微珠保温混凝土空心剪力墙热工性能研究[D].太原:太原理工大学,2016.
[8]董海荣,祁少明,徐梦杰,等.寒冷和夏热冬冷地区墙体保温对居住建筑能耗影响的异同[J].工业建筑,2017,47(6):65-69.
[9]装配式混凝土结构技术规程:JGJ1-2014[S].
[10]建筑用热流计:JG/T-1994[S].
[11]民用建筑热工设计规范:GB 50176-2016[S].
[12]董孟能,吕忠,莫天柱,等.夏热冬冷地区热桥对建筑能耗影响的定量分析[J].重庆建筑大学学报,2008,30(1):5-8.
[13]KODUR V K R,SULTAN M A.Effect of temperature on thermal properties of high-strength concrete[J].Journal of Materials in Civil Engineering,2003,15(2):1764-1764.
[14]程海峰,高瑞凯,张虎,等.薄封闭空气间层对外墙保温系统热工性能的影响[J].建筑科学,2014,30(12):43-48.
[15]夏热冬冷地区居住建筑节能设计标准:JGJ 134-2010[S].
[16]温华.多层建筑围护结构外墙角热桥传热分析[D].哈尔滨:哈尔滨工程大学,2007.
[17]任俊.热桥的影响区域[J].暖通空调,2001,31(6):109-111.