镁晶板-钢筋混凝土叠合楼板耐火性能试验研究
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重庆大学土木工程学院

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重庆市自然科学基金(cstc2021jcyj-jqX0021)


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

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    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,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小时以上。利用有限元软件ABAQUS分析了试件的耐火性能,考察了荷载比、镁晶板厚度、保护层厚度、钢筋和混凝土的强度对耐火极限的影响。分析表明,荷载比和镁晶板厚度对耐火极限的影响较大。根据试验和有限元分析结果提出了叠合板耐火极限计算方法,可为叠合楼板的防火设计提供参考。

    Abstract:

    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 of magnesium crystal plate reinforced concrete composite slab under different load ratios, three composite slab specimens were tested subjected to ISO-834 standard temperature rise, and the fire time temperature curve and mid span fire time deflection curve at different positions of the composite slab were obtained. The test results show that the composite slab has good fire resistance and the fire resistance limit can reach more than 1.5 hours. The fire resistance of the specimens was analyzed by using the finite element software ABAQUS, and the effects of load ratio, magnesium crystal plate thickness, protective layer thickness, reinforcement and concrete strength on the fire resistance limit were investigated. The analysis shows that the load ratio and the thickness of magnesium crystal plate have a great influence on the fire resistance limit. According to the test and finite element analysis results, the calculation method of fire resistance limit of composite slab is put forward, which can provide reference for fire protection design of composite slab.

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  • 收稿日期:2022-01-22
  • 最后修改日期:2022-03-03
  • 录用日期:2022-03-26
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