预制混凝土叠合楼板耐火性能试验研究及有限元分析

发布时间：2018-05-04 00:11

本文选题：叠合楼板 + 受火试验　；参考：《建筑结构学报》2015年12期

【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。
[Abstract]:Under the condition of ISO 834 standard temperature rise, the fire resistance tests of 8 prefabricated concrete composite slabs with full scale were carried out, and the types of steel bars were investigated. Whether the floor is coated with cement mortar or not and the influence of simple or continuous support on the fire resistance of superimposed floor. The test results show that under the ISO 834 standard fire, it is more reasonable to use the variation rate of the mid-span deflection as the criterion for judging the superimposed floor slab to reach the fire resistance limit, and all the specimens are eventually subjected to bending failure caused by transverse tensile cracks in the mid-span area. When the specimens are destroyed, the deflection in the span is larger and the ductility is better; the fire resistance limit of the prestressed specimens is less than that of the unprestressed specimens with equal reinforcement at room temperature; after the floor is coated with paint, the increase of the temperature of the steel bars acting on the plate is restrained. The limit of fire resistance is obviously increased, the continuous specimen restrains the upwarping of the cantilever end, reduces the load level of the specimen, and the range of the increase of the fire resistance limit is the largest. The finite element analysis software ABAQUS is used to analyze the fire response of the composite floor. The results of the finite element analysis are in good agreement with the test results. The experimental and finite element results show that the continuous superimposed floor can meet the practical engineering needs of the first grade of floor fire resistance.
【作者单位】：湖南大学土木工程学院;重庆大学土木工程学院;中航建筑工程有限公司;
【基金】：国家自然科学基金项目(51278179)
【分类号】：TU352.5;TU37

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