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预应力混凝土空心板耐火极限的试验研究*
预应力混凝土空心板耐火极限的试验研究*
摘 要
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 2000322 华南理工大学亚热带建筑科学国家重点实验室,广州 5106403 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%50%极限荷载的空心板BP25BP50的耐火极限分别为47 min30 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)11011103
 
Experimental research on fire endurance of prestressed concrete hollow-core slab exposed to fire
Xu 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
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