Performance of concrete-filled RHS columns exposed to fire on 3 sides
Performance of concrete-filled RHS columns exposed to fire on 3 sides
复制标题
3 面受火的 RHS 混凝土柱的性能
DOI：
10.1016/j.engstruct.2013.08.019
复制
发表时间：
2013-11
影响因子：
5.5
通讯作者：
Leroy Gardner
中科院分区：
文献类型：
--
作者：
Hua Yang;Faqi Liu;Leroy Gardner
在过去的几十年里，钢管混凝土（CFST）柱在均匀火灾下的行为已经得到了很好的研究。然而，对三面受火的矩形空心混凝土柱的性能的认识是有限的，这是一种常见的情况在实践中。因此，本文提出了一个实验和数值研究的反应RHS混凝土填充柱受到三面火灾暴露。三个足尺RHS柱，其中两个暴露于三个方面，其他方面的火灾，进行了试验失败。记录并讨论了温度分布、轴向位移、侧向位移和破坏模式。在实验的基础上，建立了热-应力耦合的数值模型，进行了传热分析和应力分析。根据试验结果对有限元模型进行了验证，并用于帮助理解所观察到的失效机制，并扩展关键参数的研究范围。这些参数包括荷载比、荷载偏心率、截面尺寸、长细比、含钢率和组成材料的强度。结果表明，荷载比、截面尺寸和荷载偏心距对构件的耐火极限有显著影响。基于参数研究的结果，提出了一个简化的设计公式，用于预测RHS混凝土柱的耐火极限。在此基础上，基于均匀火灾下方钢管混凝土柱的抗火设计方法，提出了方钢管混凝土柱三面受火设计的折减系数法，便于工程应用。
The behaviour of concrete-filled steel tubular (CFST) columns subjected to uniform fires has been well studied over the past few decades. However, knowledge of the performance of concrete-filled rectangular hollow section (RHS) columns exposed to fire on 3 sides, which is a common scenario in practice, is limited. Hence, this paper presents an experimental and numerical study into the response of concrete-filled RHS columns subjected to 3-sided fire exposure. Three full-scale concrete-filled RHS columns, two of which were exposed to fire on 3 sides and the other on 4 sides, were tested to failure. The temperature distributions, axial displacements, lateral displacements and failure modes were all recorded and discussed. Following the experiments, a sequentially coupled thermal–stress numerical model was developed, featuring heat transfer analysis and stress analysis. The FE model was validated against the test results, and used to assist in the understanding of the observed failure mechanisms and to extend the investigated range of key parameters. These parameters included load ratio, load eccentricity, cross-sectional dimensions, slenderness ratio, steel ratio and strengths of the constituent materials. It was found that the load ratio, cross-sectional dimensions and load eccentricity have a significant influence on the fire resistance. Based on the results of the parametric studies, a simplified design formula was developed for predicting the fire resistance of concrete-filled RHS columns subjected to 3-sided exposure. Furthermore, a reduction factor method was proposed for the design of concrete-filled RHS columns exposed to 3-sided fire, based on fire safety design methods for concrete-filled RHS columns in uniform fire, which may be more convenient for engineering applications.
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DOI：
10.3850/978-981-07-2615-7_151
发表时间：
2012
期刊：
Bulletin of The Geological Society of China
影响因子：
--
作者：
Faqi Liu;Hua Yang;Sumei Zhang
通讯作者：
Faqi Liu;Hua Yang;Sumei Zhang
影响因子：
6.4
作者：
X. Zhao;J. Packer
通讯作者：
X. Zhao;J. Packer
影响因子：
4.1
作者：
Hui Lu;X. Zhao;Lin-Hai Han
通讯作者：
Hui Lu;X. Zhao;Lin-Hai Han
钢筋混凝土 (RC) 梁与钢管混凝土 (CFST) 柱框架在 ISO-834 标准火灾下的实验行为
影响因子：
5.5
作者：
Han, Lin-Hai;Wang, Wei-Hua;Yu, Hong-Xia
通讯作者：
Yu, Hong-Xia
影响因子：
4.1
作者：
P. Schaumann;V. Kodur;O. Bahr
通讯作者：
P. Schaumann;V. Kodur;O. Bahr