镁晶板-钢筋混凝土叠合楼板耐火性能试验研究  

Experimental study on fire resistance of magnesium crystal plate reinforced concrete composite floor

作　　者：王卫永[1,2] 李亚盟 李江 WANG Weiyong;LI Yameng;LI Jiang(School of Civil Engineering,Ministry of Education,Chongqing University,Chongqing 400045,P.R.China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045,P.R.China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《土木与环境工程学报（中英文）》2023年第3期44-54,共11页Journal of Civil and Environmental Engineering

基　　金：重庆市自然科学基金(cstc2021jcyj-jqX0021)。

摘　　要：镁晶板—钢筋混凝土叠合楼板的下层为预制新型耐火材料镁晶板,上层为现浇钢筋混凝土板。为了研究镁晶板—钢筋混凝土叠合楼板在不同荷载比下的耐火性能及耐火等级,对3块叠合楼板试件进行ISO-834标准升温下的受火试验,得到叠合板不同位置的受火时间—温度曲线和受火时间—跨中位移曲线。试验表明,叠合板具有良好的耐火性能,耐火极限可达到1.5 h以上。利用有限元软件ABAQUS分析了试件的耐火性能,通过与试验结果对比,验证了模型的可靠性,进而采用模型考察荷载比、镁晶板厚度、混凝土保护层厚度、钢筋和混凝土的强度对叠合楼板耐火极限的影响。分析表明,荷载比和镁晶板厚度对叠合楼板耐火极限影响较大。基于参数分析结果,给出不同荷载比和不同镁晶板厚度叠合板的耐火极限。The lower layer of magnesium crystal plate reinforced concrete composite floor is a prefabricated new fire-resistant magnesium crystal plate,and the upper layer is cast-in-situ reinforced concrete plate.In order to study the fire resistance and fire resistance rating of magnesium crystal plate reinforced concrete composite slab under different loading ratios,three composite slab specimens were tested subjected to ISO-834 standard temperature rise,and the fire time-temperature curve and fire time mid span-deflection curve at different positions of the composite slab were obtained.The test results show that the composite slab has good fire resistance up to more than 1.5 hours.The fire resistance of the specimens was analyzed by using the finite element software ABAQUS,and the reliability of the established model was verified by comparing with test results.The effects of loading ratio,thickness of magnesium crystal plate,thickness of concrete protective layer,strength of reinforcement and concrete on the fire resistance limit were investigated via the established model.The analysis shows that the load ratio and the thickness of magnesium crystal plate have great influence on the fire resistance of the composite slab.Based on parametric analysis,the fire resistance of composite slab is proposed for different loading ratios and thicknesses of magnesium crystal plate.

关 键 词：镁晶板 叠合楼板 耐火试验 有限元分析 荷载比 

分 类 号：TU398[建筑科学—结构工程] TU375.2