摘要
为分析不同持荷水平下受约束预应力混凝土空心板整浇楼面的耐火极限变化规律,进行了3块受约束预应力混凝土空心板整浇楼面试件的耐火极限试验研究。结果表明：未受火对比试件与受火试件均发生弯曲破坏;持荷比分别为0.3和0.5的试件的耐火极限分别为132 min和73 min,即试件的耐火极限随着持荷比的增加而显著降低;试件内部温度升高存在明显的滞后,截面形成不均匀温度场,呈层状分布;预制空心板孔洞内的温度明显高于相同位置混凝土测点的温度。采用ABAQUS软件对受约束预制空心板整浇楼面试件的截面温度场和不同持荷比下耐火极限进行了数值模拟,结果表明提出的有限元模型能够较准确地预测试件的温度场分布和耐火极限。
To investigate the fire endurance of PC hollow-core slab integrated floor with constraints, 3 specimens at different load levels were experimentally studied. It shows that the control specimen and exposed specimens all collapse with flexural failure mode. The fire endurances of specimens are 132 and 73 minutes respectively when the load levels are 0.3 and 0.5. It is found that the fire endurance of specimen exposed to fire is decreased apparently when the load level is increased. There is a significant delay of the increase of internal temperature. The cross section forms a non- uniform temperature field and shows a layered distribution. The temperature in the holes is significantly higher than that of the concrete at the same height. The cross section temperature field and fire endurance of specimens at different load levels were simulated by ABAQUS. The proposed finite element model can be used for prediction of temperature field and fire endurance with good accuracy.
作者
韩重庆
许清风
李梦南
陈玲珠
HAN Chongqing;XU Qingfeng;LI Mengnan;CHEN Lingzhu(Architects ＆ Engineers Co., Ltd of Southeast University, Nanjing 210096, China;Shanghai Key Laboratory of Engineering Structure Safety, SRIBS, Shanghai 200032, China;School of Civil Engineering, Southeast University, Nanjing 210096, China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第5期52-62,共11页
Journal of Building Structures
基金
国家十三五重大科技专项(2016YFC0701306)
上海市优秀技术带头人项目(15XD1522600)
