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。
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.
出处
《建筑结构》
CSCD
北大核心
2012年第11期111-113,80,共4页
Building Structure
基金
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)
关键词
预应力混凝土空心板
受火
耐火极限
跨中挠度
prestressed concrete hollow-core slab
exposure to fire
fire endurance
mid-span displacement
