Post-fire mechanical behaviour of ultra-high-performance concrete-filled steel tube (UHPCFST) stub columns under compression
Post-fire mechanical behaviour of ultra-high-performance concrete-filled steel tube (UHPCFST) stub columns under compression
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受压超高性能钢管混凝土 (UHPCFST) 短柱的火灾后力学行为
DOI：
10.1016/j.jcsr.2022.107384
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发表时间：
2022-09
影响因子：
4.1
通讯作者：
Sumei Liu
中科院分区：
文献类型：
--
作者：
Tan Wang;Min Yu;Xipeng Zhang;Shanshan Cheng;Sumei Liu
进行了24个足尺试验，以研究高温作用下UHPCFST短柱轴向受压的火灾后性能。试验参数包括截面尺寸、加热方式、钢纤维含量和粗骨料含量。分析了试件的破坏模式、截面历史最高温度、轴向荷载-变形曲线和剩余抗压承载力。试验结果表明，横截面历史最高温度的非均匀和非线性分布。结果表明，随着升温速率的增大和截面尺寸的减小，历史温度对超高性能钢管混凝土柱的剩余承载力的影响更加明显。受火灾下平均温度法概念的启发，提出了一种基于截面平均历史最高温度计算火灾后钢管混凝土柱剩余承载力的方法。计算结果表明，该方法具有较高的计算精度，可为UHPCFST短柱的火灾后评估和加固提供参考。·在轴向压缩条件下，在高温后对全尺寸UHPCFST短柱进行了测试。·分析了UHPC混合料、截面尺寸和加热方式对UHPCFST短柱火灾后性能的影响。·提出了一种基于历史最高温度均值的钢管混凝土柱剩余承载力计算方法。
Twenty-four full-scale tests were carried out in order to investigate the post-fire behaviour of UHPCFST stub columns under axial compression after being exposed to elevated temperatures. The test parameters include cross-sectional size, heating mode, steel fibre content, and coarse aggregate content. The failure modes, cross-sectional historical maximum temperatures, axial load-deformation curves, and residual compressive capacities of the specimens are analysed. The test results revealed non-uniform and nonlinear distributions of the cross-sectional historical-max temperatures. It is found that the effect of historical temperature on the residual capacity of a UHPCFST column is more obvious with the increase of the heating rate and decrease of the cross-sectional size. Inspired by the concept of average temperature method under fire, a method for calculating the post-fire residual load capacity of CFST columns was proposed based on the average historical-max temperature of the cross-section. High accuracy has been found for using the proposed calculation method, therefore the work could serve as a reference for the post-fire assessment and strengthening of UHPCFST stub columns. • Full-scale UHPCFST stub columns were tested after elevated temperatures under axial compression. • The effect of UHPC mixture, sectional size and heating mode on post-fire behaviour of UHPCFST stub columns were analysed. • A method for calculating the residual capacity of CFST columns based on average historical-max temperature was proposed.
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