Post-fire resistance of internally ring stiffened high performance concrete filled steel tube columns
Post-fire resistance of internally ring stiffened high performance concrete filled steel tube columns
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DOI：
10.1016/j.engstruct.2019.01.024
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发表时间：
2019-03
影响因子：
5.5
通讯作者：
T. Ekmekyapar;I. A. Alhatmey
中科院分区：
文献类型：
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作者：
T. Ekmekyapar;I. A. Alhatmey
复合材料结构的使用在世界范围内呈指数级增长，因为此类结构提供了组成材料的综合优势并提供了具有成本效益的解决方案。钢管混凝土（CFST）柱已被证明是一种非常有效的复合结构方法。尽管钢管混凝土柱在许多不同荷载情况下的行为已经很详细，但对文献的检索显示，对这些构件的耐火后性能的研究很少。本文介绍了钢管混凝土柱的内环加固，旨在提高其耐火后性能。为此，对带内环和不带内环的钢管混凝土柱进行了标准的火灾暴露。为了解决其火灾后性能问题，对暴露于火的样本和未暴露于火的对应样本（总共 30 个样本）进行了同心压缩至失效的测试。钢管混凝土柱试件采用自密实高性能混凝土制造，以获得可在高应力工程结构中利用的关键知识。实验结果表明，通过适当的设计，内环可以非常有效地提供高耐火后性能。一些特定的配置所实现的耐火后抗火能力高于没有暴露在火中的经典钢管混凝土同类产品的能力。因此，结果表明，内环有可能消除对外部涂层或任何其他昂贵的防火措施的需求，以规避火灾后的设计问题。这项研究的结果提供了新颖的见解，并提供了具有成本效益的解决方案，以提高钢管混凝土柱在环境温度下和火灾后的性能。
Use of composite construction is increasing exponentially across the world, since such structures offer the combined benefits of constituent materials and provide cost effective solutions. Concrete filled steel tube (CFST) columns have been proven to be a very efficient way of composite construction. Although the behaviour of CFST columns under many different loading scenarios has been well detailed, a search of the literature revealed few studies on the post-fire resistance of these members. This paper gives an account of internally ring stiffening of CFST columns with the aim of advancing their post-fire resistance. To this end, CFST columns with and without internal rings were subjected to a standard fire exposure. To address their post-fire performance, fire exposed specimens and counterparts without fire exposure (in total 30 specimens) were tested under concentric compression to failure. CFST column specimens were manufactured using self-compacted high performance concrete to acquire key knowledge which could be exploited in highly stressed engineering structures. Experimental results indicate that with a proper design, internal rings are very efficient in providing high post-fire resistances. Some specific configurations achieved post-fire resistances greater than that of the capacities of classical CFST counterparts without fire exposure. Accordingly, it is shown that internal rings have the potential to eliminate the need for external coating or any other expensive fire protection measure to circumvent post-fire design concerns. The findings of this research provide novel insights and offer cost effective solutions to improve the performance of CFST columns under ambient temperature and after fire exposure.