预制混凝土叠合楼板耐火性能试验研究及有限元分析  

Experimental research and FEA on fire resistance performance of precast concrete composite slabs

作　　者：周绪红[1,2] 邓利斌[1] 吴方伯[1] 刘彪[1] 李钧[1,3] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]重庆大学土木工程学院,重庆400044 [3]中航建筑工程有限公司,湖南长沙410000

出　　处：《建筑结构学报》2015年第12期82-90,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51278179)

摘　　要：在ISO 834标准升温条件下,进行了8个预制混凝土叠合楼板足尺试件的耐火性能试验,考察钢筋类别、板底是否涂抹水泥砂浆粉刷层以及简支或连续等因素对叠合楼板耐火极限的影响。试验结果表明:在ISO 834标准火灾下,以跨中挠度变化率作为叠合楼板达到耐火极限的判别标准更为合理;所有试件最终均发生跨中区域横向受拉裂缝引起的弯曲破坏,破坏时各试件的跨中挠度较大,延性较好;预应力试件耐火极限小于常温下等强配筋的非预应力试件;板底涂抹粉刷层后,抑制了板内受力钢筋温度的升高,耐火极限明显提高;连续试件约束了悬挑端上翘,降低了试件的荷载水平,耐火极限提高幅度最大。采用有限元分析软件ABAQUS对试验叠合楼板进行了火灾反应分析,有限元分析结果与试验结果吻合良好。试验和有限元结果表明:连续叠合楼板能够满足楼板耐火等级为一级的实际工程需要。Eight precast concrete composite specimens were tested to study the fire resistance performance,following the ISO 834 standard heating process. The influences of steel types,mortar cover and simply supported type or continuous type on fire endurance of the composite specimens were analyzed. Test results indicate that the changing rate of mid-span displacement can be a suitable criterion to determine the fire endurance of the composite specimens under the ISO 834 standard fire. All specimens collapse with the flexural failure mode caused by lateral tension cracks at mid-span area and have large mid-span deflection and good ductility at failure. The prestressed composite specimens have less fire endurance than the non-prestressed ones with equal strength reinforcement distribution at room temperature. The fire endurance increases remarkably when the mortar cover is painted, as it can inhibit the temperature increasing of reinforcement. The increase of fire endurance of continuous specimens is the highest because of the constraint on cantilevered end upward and reduction of load levels. In addition,the authors conducted numerical simulation of fire experiments by using the finite element analysis software ABAQUS and the results between experiments and FEA are close. The results of experiments and numerical simulation analysis indicate that the continuous composite slabs can meet the requirements of first fire rating in actual engineering.

关 键 词：叠合楼板 受火试验 有限元分析 耐火极限 跨中挠度变化率 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1