预应力混凝土空心板耐火极限的试验研究*
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许清风1,2,韩重庆3,全威3,李向民1(1 上海建科院上海市工程结构新技术重点实验室,上海 200032; 2 华南理工大学亚热带建筑科学国家重点实验室,广州 510640; 3 东南大学建筑设计研究院,南京 210096)[摘要]底面受火预应力混凝土空心板耐火极限由空心板跨中挠度、跨中挠度变化率和试件断裂破坏综合确定。通过5块预应力混凝土空心板底面受火耐火极限的对比试验,研究了不同持荷水平底面受火空心板的耐火极限。研究结果表明,分别持荷25%和50%极限荷载的空心板BP25和BP50的耐火极限分别为47 min和30 min,即随着持荷水平增加,底面受火空心板耐火极限明显降低。[关键词]预应力混凝土空心板; 受火; 耐火极限; 跨中挠度中图分类号:TU3525文献标识码:A文章编号:1002848X(2012)11011103Experimental research on fire endurance of prestressed concrete hollow-core slab exposed to fireXu Qingfeng1,2, Han Chongqing3, Quan Wei3, Li Xiangmin1(1 Shanghai Key Laboratory of New Technology Research on Engineering Structure, SRIBS, Shanghai 200032, China; 2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China; 3 Architecture Design & Research Institute, Southeast University, Nanjing 210096, China)Abstract: The fire endurance of prestressed concrete hollow-core slab is determined not only by the mid-span displacement and the changing rate of mid-span displacement, but also by the failure of the slab. In order to learn the effect of the load level on the fire endurance, 5 specimens were experimentally studied. The fire endurances of BP25 (the invariable load is 25% of ultimate load) and BP50 (the invariable load is 50% of ultimate load) were 47min and 30min respectively. It was found that the fire endurance of prestressed concrete hollow-core slabs exposed to fire had an obvious decrease when the load level increased.Keywords: prestressed concrete hollow-core slab; exposure to fire; fire endurance; mid-span displacement*华南理工大学亚热带建筑科学国家重点实验室开放课题(2010KB12),上海市科委青年科技启明星跟踪计划(11QH1402100)。作者简介:许清风,博士,高级工程师,Email:qingfengxu@yahoo.com.cn。参考文献[1] 张泽江,梅秀娟,何世家. 灰浆层对钢筋混凝土楼板耐火极限的影响[J]. 中国安全生产科学技术,2010,6(2):5660.[2] 吴波,王军丽. 碳纤维布加固钢筋混凝土板的耐火性能试验研究[J]. 土木工程学报, 2007,40(6):2631.[3] 袁爱民,董毓利,戴航, 等. 无粘结预应力混凝土三跨连续板火灾试验研究[J]. 建筑结构学报,2006,27(6):6066.[4] 高本堂,董毓利,袁爱民. 无粘结预应力混凝土简支板的抗火试验研究[J]. 建筑结构,2004,34(4):4244.[5] 陈礼刚,董毓利,李晓东. 钢筋混凝土三跨连续板中跨受火试验研究[J]. 建筑结构,2004,34(4):3941.[6] SHI X, TAN T, TAN K, et al. Influence of concrete cover on fire resistance of reinforced concrete flexural members [J]. Journal of Structural Engineering, ASCE, 2004,130(8):12251232.[7] SHI X, TAN T, TAN K, et al. Effect of forcetemperature paths on behavious of reinforced concrete flexural members [J]. Journal of Structural Engineering, ASCE, 2002,128(3):365373.[8] KODUR V, BISBY L. Evaluation of fire endurance of concrete slabs reinforced with fiberreinforced polymer bars [J]. Journal of Structural Engineering, ASCE, 2005,131(1):3443.[9] 苏G9401 120预应力混凝土空心板图集(冷轧带肋钢筋)[S]. 南京:江苏省工程建设标准设计站,1994.[10] GB/T 99781—2008建筑构件耐火试验方法 第1部分:通用要求[S].北京: 中国建筑工业出版社,2009.