钢筋混凝土T形截面连续梁耐火性能试验研究及有限元分析

发布时间：2018-04-16 02:26

本文选题：钢筋混凝土T形截面连续梁 + 温度场　；参考：《建筑结构学报》2015年02期

【摘要】：通过4根钢筋混凝土T形截面连续梁在ISO 834标准升温曲线下耐火极限的试验研究,分析不同持荷水平下三面受火T形截面连续梁的耐火极限变化规律。结果表明:未受火对比试件和受火试件均发生弯曲破坏,但出铰次序不同;持荷比分别为0.3、0.5和0.7的T形截面连续梁的耐火极限分别为160、99、58 min,即随着持荷比的增大其耐火极限显著降低,且达到耐火极限时的跨中残余变形明显增大;T形截面梁翼缘内温度分布与单面受火板相似,腹板内温度分布与三面受火矩形梁相似;在受火过程中,梁截面刚度下降是引起内力重分布的主要原因;有限元模拟能准确预测钢筋混凝土T形截面连续梁在ISO 834标准升温曲线下的耐火极限、截面温度场分布和破坏过程。
[Abstract]:Based on the experimental study of fire resistance of 4 reinforced concrete T-section continuous beams under ISO 834 standard heating curve, the variation law of fire resistance limit of T-section continuous beams subjected to fire on three sides under different load levels is analyzed.The results show that the bending failure occurs in the unburned contrast specimen and the fire specimen, but the hinge order is different.The fire resistance limit of T-section continuous beams with 0.3- 0.5 and 0.7 loading ratios is 160 ~ 999 ~ 58 mins respectively, that is, the fire resistance limit decreases significantly with the increase of the load-holding ratio.And the residual deformation in span increases obviously when the fire resistance limit is reached. The temperature distribution in flange of T-section beam is similar to that in single side fire plate, and the temperature distribution in web plate is similar to that in rectangular beam with three sides of fire.The reduction of beam section stiffness is the main reason for the redistribution of internal force, and the finite element simulation can accurately predict the fire resistance limit, section temperature field distribution and failure process of reinforced concrete T-section continuous beam under ISO 834 standard heating curve.
【作者单位】：东南大学建筑设计研究院有限公司;上海市工程结构安全重点实验室;上海市建筑科学研究院(集团)有限公司;中铁第四勘察设计院集团有限公司;
【基金】：上海市人才发展资金资助项目(2011058) 上海市科委应用技术开发项目(2011-114)
【分类号】：TU375.1

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