板角约束混凝土双向板抗火性能试验研究

发布时间：2018-04-19 20:13

本文选题：钢筋混凝土双向板 + 板角约束　；参考：《建筑结构学报》2017年05期

【摘要】：为研究混凝土双向简支板板角受平面外约束下的火灾行为,进行了恒载-升温条件下的火灾试验。采用无线测温技术和红外探测技术,获得了火灾下双向板沿板厚温度场分布、钢筋温度、板平面内外变形、裂缝以及板角平面外约束力变化,并与国内外相关试验进行对比分析。测试结果表明:自行设计无线测温设备测量精确度较高,且便于使用;红外探测技术能够实时记录板面裂缝发展。分析结果表明:当板角受平面外约束时,其裂缝模式及变形规律与四边简支板明显不同;且板角区域易出现弧形裂缝,板角约束程度对板角区域弧形裂缝分布与发展有显著影响。
[Abstract]:In order to study the fire behavior of concrete bidirectional simply supported slabs under out-of-plane restraint, the fire tests were carried out under the condition of dead load and temperature rise. By using wireless temperature measurement technique and infrared detection technique, the temperature distribution of bidirectional slab along the thickness of the plate, the temperature of steel bar, the deformation inside and outside the plane of the plate, the crack and the binding force change outside the plane of the plate angle are obtained. And compared with the domestic and foreign related tests. The test results show that the wireless temperature measuring equipment designed by ourselves is accurate and convenient to use, and the infrared detection technology can record the development of plate surface cracks in real time. The results show that when the angle of the plate is constrained by the outside plane, the crack mode and deformation law are obviously different from those of the simply supported plate on the four sides, and the arc crack is easy to appear in the area of the plate angle. The angle restraint degree has a significant effect on the distribution and development of arc crack in the plate angle region.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点试验室;江苏建筑节能与建造技术协同创新中心;中国矿业大学力学与土木工程学院;
【基金】：国家青年科学基金项目(51408594) 中国博士后科学基金特别项目(2016T90525) 江苏建筑节能与建造技术协同创新中心项目(SJXTQ1614)
【分类号】：TU375.2

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