Experimental study on random temperature field of ultra-high performance concrete filled steel tube columns under elevated temperature
Experimental study on random temperature field of ultra-high performance concrete filled steel tube columns under elevated temperature
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高温下超高性能钢管混凝土柱随机温度场试验研究
DOI：
10.1016/j.compstruct.2022.115445
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发表时间：
2022-03
影响因子：
6.3
通讯作者：
Jianqiao Ye
中科院分区：
文献类型：
--
作者：
Tan Wang;Min Yu;Xipeng Zhang;Jianqiao Ye
由于超高性能混凝土（UHPC）与普通混凝土相比，其微观结构的变化和非均匀性的增加，使得材料内部的热性能变得不均匀。因此，UHPCFST（UHPCFST）柱的耐火性能受到混凝土内温度的随机分布的影响。为了研究高温下超高碳钢管混凝土柱内随机温度场的分布规律，对16根超高碳钢管混凝土圆柱进行了ISO-834标准火灾和线性加热模式下的高温试验。研究了随机温度场的平均温度、温差、温度概率密度分布以及随机温度场的时空相关性。结果表明，钢纤维和粗骨料含量越多，柱体温度越高，温度梯度越小，温差越大。研究还发现，当温度继续上升或下降时，不同时刻周向零心温度的相关性较强。为考虑超高强混凝土芯材非均匀性的超高强混凝土温度场分析提供参考。
Due to the change of microstructure and increased heterogeneity of ultra-high-performance concrete (UHPC) in comparison with normal concrete, the thermal properties of UHPC are much less uniform within the material. Consequently, the fire performance of UHPC filled steel tubes (UHPCFST) columns are affected by the random distribution of temperature within the concrete. In order to study the distribution of the random temperature field within UFPCFST columns under elevated temperature, high temperature tests on 16 circular UHPCFST columns subjected to the ISO-834 standard fire and a linear heating mode are carried out. The average temperature, temperature difference, temperature probability density distribution and the temporal and spatial correlation of the random temperature field are investigated. It is found that the columns with more steel fiber and coarse aggregate contents have higher temperature, small temperature gradient and higher temperature difference. It is also found that the correlation of the zero-centered temperature in the circumferential direction between different time is strong when the temperature continues to rise or fall. The aims of this paper is to provide the reference for the analysis of temperature field of UHPCFST considering the heterogeneity of UHPC core.
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