摘要
新型承重围护保温一体化墙板是将承重框架与围护系统融为一体并在工厂预制的新型复合墙体,为探究该墙板的耐火性能,对其进行耐火性能试验研究,得到了复合墙板背火面平均温度和最高温度曲线。在此基础上,建立了墙板的有限元模型,对该模型进行热力耦合分析和耐火性能的参数化分析,探究了保护层厚度和墙板耐火极限之间的关系,得到了保护层厚度和墙板耐火极限之间的关系式。研究结果表明:300 mm厚墙板的耐火极限可达5.7 h;墙板砂浆保护层厚度是影响其耐火性能的主要因素,保护层越厚,背火面温度越低,耐火性能越好,墙板轴向位移随轴压比的增大而减小;泡沫混凝土密度和墙板含钢率对墙板耐火性能影响不大,但增大泡沫混凝土密度能够有效减小墙板的轴向位移。
This assembled insulation integrated wall is a new composite wall which integrates the load-bearing frame with an enclosure system.In order to study the fire performance of the wall,the fire resistance test is carried out,the average temperature and maximum temperature curves of the unexposed surface of composite wall are obtained.Then a finite element model of this wall is built,the thermal-mechanical coupling analysis and parametric analysis of fire performance are carried out,and the relation between the thickness of protective cover and the fire resistance limit are studied.The results indicate that the fire resistance of 300 mm thick wall can reach 5.7 h.The thickness of mortar protective cover is the main factor affecting the fire performance.If the protective cover is thicker,the unexposed surface temperature is lower,and the fire performance is better.The axial displacement of wall decreases with the increase of axial compression ratio.The density of foam concrete and steel ratio of the wall have little influence to the fire performance,but increasing the density of foam concrete can effectively reduce the axial displacement of the wall.
作者
周学军
李慧敏
刘哲
王振
王兴博
马文斐
ZHOU Xuejun;LI Huimin;LIU Zhe;WANG Zhen;WANG Xingbo;MA Wenfei(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Rail Transit Survey and Design Institute Co.,Ltd.,Jinan 250101,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2022年第5期81-91,共11页
Progress in Steel Building Structures
基金
国家重点研发计划(SQ2020YFF0426523)。
关键词
新型承重围护保温一体化墙板
耐火性能
试验研究
有限元分析
耐火极限
new assembled insulation integrated wall
fire performance
experimental study
finite element analysis
fire resistance
