摘要
为研究中空内模水泥隔墙的抗火性能,本文对其进行了单面受火试验。重点研究了2种典型空腔形式水泥隔墙在受火条件下的热响应、耐火极限和平面外变形,揭示其在单面受火下的传热机理。以试件W1和W2为基础,对不同空腔形式的空腔体积率进行参数化分析,探究其传热方式中热传导与热辐射的占比关系,进而确定其临界空腔体积率。试验结果表明:中空内模水泥隔墙的耐火极限均大于139 min;在相同的受火条件下,试件背火面的平均温升、水蒸气逸出持续时间均随着空腔体积率的增大而减小;由于水泥砂浆热桥效应导致不连续空腔耐火性能较差;当空腔体积率低于临界空腔体积率35%时,水泥砂浆热传导的效率更高;而当空腔体积率超过临界空腔体积率后,空腔热辐射的传热效率更高。降低空腔体积率可有效提高中空内模水泥隔墙的抗火性能。
To investigate the fire resistance performance of hollow internal mold cement partition walls,this study conducted one-sided fire exposure tests on such walls.The research focused on analyzing three critical aspects under fire conditions:failure modes,thermal response,and out-of-plane displacements of cement wall panels with different cavity configurations,thereby revealing the heat transfer mechanism during unilateral fire exposure.Parametric analysis based on specimens W1 and W2 examined volumetric cavity ratios of different cavity forms,exploring the proportional relationship between thermal conduction and radiation in heat transfer while determining the critical cavity volume ratio.Experimental results demonstrate that the fire resistance limit of hollow internal mold metal mesh cement partition walls exceeded 139 minutes.Under identical fire exposure conditions,the average temperature rise on the unexposed surface decrease with increasing volumetric cavity ratio.The duration of water vapor emission from the unexposed surface reduce progressively with higher cavity volume ratios.Discontinuous cavities exhibit inferior fire resistance due to the thermal bridging effect of cement mortar.Below the critical cavity volume ratio of 35%,heat conduction through cement mortar dominates heat transfer efficiency,whereas cavity radiation becomes predominant beyond this threshold.Reducing the volumetric cavity ratio effectively enhances the fire resistance performance of hollow internal mold cement wall panels.
作者
陈宜虎
林景超
谢光信
娄灵霖
张敏
CHEN Yihu;LIN Jingchao;XIE Guangxin;LOU Linglin;ZHANG Min(Guangxi Key Laboratory of Green Building Materials and Construction Industrialization(Guilin University of Technology),Guilin 541004,China;School of Civil Engineering,Guilin University of Technology,Guilin 541004,China;College of Architecture and Electrical Engineering,Hezhou University,Hezhou 542800,China;VLINKER CAYMAN LIMITED,Shanghai 200000,China)
出处
《广西科技大学学报》
2026年第1期58-66,共9页
Journal of Guangxi University of Science and Technology
基金
广西重点研发计划项目(桂科AB22036001)
广西重点实验室基金项目(桂能17-J-21-9)
贺州市科技发展计划项目(贺科技202229)资助。
关键词
中空内模水泥隔墙
水泥砂浆
传热机理
耐火极限
参数化分析
hollow inner form cement partition wall
cement mortar
heat transfer mechanism
fire resistance limit
parametric analysis
