带连接板的空心板整浇楼面耐火性能分析  

Analysis on Fire Resistance Performance of Hollow-Core Slab Integrated Floor With Link Slab

作　　者：郑知航 曾志兴[1] LIU Angela 罗漪[1] ZHENG Zhihang;ZENG Zhixing;LIU Angela;LUO Yi(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;Building Research Association of New Zealand,Porirua 5381,New Zealand)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]Building Research Association of New Zealand,Porirua 5381

出　　处：《华侨大学学报（自然科学版）》2022年第5期603-611,共9页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金面上资助项目(51878302,52078225)。

摘　　要：为分析带连接板的空心板整浇楼面试件的耐火性能,通过有限元分析方法,建立恒载升温下的空心板整浇楼面试件的数值分析模型,并与试验结果进行对比和验证.基于验证后的有限元模型,分析荷载水平、空心几何尺寸、现浇楼板钢筋网屈服强度和空心板端可压缩层厚度对空心板整浇楼面耐火性能的影响.结果表明:试件的破坏形态、温度场分布、板面挠度变化的模拟结果与试验结果吻合较好;邻近连接板的空心板肋部发生连贯破坏;通过生死单元法能较好地还原破坏现象对后续温度及变形发展趋势的影响;连接板构造是空心板整浇楼面隔热较弱部分,不利于整体结构防火;随着荷载水平的提高,试件的耐火极限显著降低,试件连接板与空心板交界处及现浇板的中心区域发生破坏;空心尺寸改变、钢筋网强度减少、可压缩层厚度增加均会使空心板整浇楼面的耐火性能出现不同程度的下降.In order to analyze the fire resistance performance of hollow core slab integrated floor specimen with link slab,the numerical model of hollow core slab integrated floor specimen under constant load heating is established by finite element method,and the results are compared and verified with the test results.Based on the verified finite element model,the effects of various factors on the fire resistance performance of hollow core slab integrated floor are analyzed,such as load level,hollow core geometry size,the yield strength of cast in place floor steel mesh and the thickness of the compressible layer at hollow core slab end.The results show that the simulation results of the failure mode,temperature field distribution and floor deflection change of the specimen are in good agreement with the test results.Continuous destruction occurs on the ribs of hollow core slab adjacent to the link slab.The influence of failure phenomena on subsequent temperature and deformation can be well simulated by birth death element method.The link slab structure is a weak part of hollow core slab integrated floor,which is not conducive to the fire protection of the whole structure.With the increase of the load level,the fire resistance of the specimen decreases significantly,and the junction between the link slab and the hollow core slab of the specimen and the central area of the cast in place slab are damaged.The change of hollow core size,the decrease of steel mesh strength and the increase of compressible layer thickness decrease the fire resistance of hollow core slab integrated floor.

关 键 词：空心板整浇楼面 连接板 火灾 有限元分析 

分 类 号：TU378.5[建筑科学—结构工程] TU352.502