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首页> 外文期刊>Journal of structural fire engineering >Numerical analysis on circular concrete-filled tubular columns subjected to fire
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Numerical analysis on circular concrete-filled tubular columns subjected to fire

机译：圆形钢管混凝土柱火灾的数值分析

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摘要

Purpose - Nowadays, circular concrete-filled tubular (CFT) columns are largely used in construction because of structural and architectural advantages such as high load bearing capacity and aesthetic appearance. The behavior of CFT columns at ambient and high temperatures is good; however, there are problems related to their behavior in fire when inserted in a real building structure, as for example, the influence of the restraining to thermal elongation that have to be addressed in order to improve their design. This study aims to present the results of a numerical study on the behavior of CFT columns with restrained thermal elongation in case of fire. Design/methodology/approach - The parameters tested in the numerical simulations included column slenderness, load level, surrounding structure stiffness and steel reinforcement ratio. A sequentially coupled thermal stress analysis was carried out The numerical model was validated with results from a large series of fire resistance tests carried out at Coimbra University, in Portugal. From these, simple equations to evaluate CFT column critical times were derived. Findings - The results were also compared with the ones obtained from the current EN 1994-1-22005 simplified calculation and tabulated data methods. For the analyzed cases, it was verified that, while the simplified calculation method led to safe results on the evaluation of the fire resistance of CFT columns with restrained thermal elongation, the tabulated data method led, in certain cases, to unsafe results. This research showed also lower critical times than those from literature on similar type of columns. Originality/value - The influence of the stiffness of the surrounding structure on the behavior of CFT columns subjected to fire was not yet clear in the major part of the studies already carried out. So, this paper has the originality to consider this parameter in the numerical simulations of this type of columns.
机译：目的-如今，由于结构和建筑上的优势（例如高承载能力和美观），圆形混凝土填充管状（CFT）柱被广泛用于建筑中。 CFT色谱柱在室温和高温下的性能良好；然而，当将它们插入真实的建筑结构中时，存在着与它们在火灾中的行为有关的问题，例如，为了改善其设计而必须解决的对热伸长率的影响。这项研究的目的是提出关于在火灾情况下具有受限热伸长率的CFT柱性能的数值研究结果。设计/方法/方法-在数值模拟中测试的参数包括柱的细长度，载荷水平，周围结构的刚度和钢筋比率。进行了顺序耦合的热应力分析。通过在葡萄牙科英布拉大学进行的一系列耐火测试得出的结果验证了该数值模型。由此得出了评估CFT色谱柱临界时间的简单方程式。结果-将结果与从当前的EN 1994-1-22005简化计算和列表数据方法获得的结果进行了比较。对于分析的情况，已证实，尽管简化的计算方法在评估热伸长受限的CFT柱的耐火性方面得出了安全的结果，但表格数据方法在某些情况下却导致了不安全的结果。这项研究还表明，与同类色谱柱上的文献相比，临界时间更低。原创性/价值-在已经进行的大部分研究中，尚不清楚周围结构的刚度对遭受火灾的CFT柱性能的影响。因此，本文具有在此类色谱柱的数值模拟中考虑此参数的创意。

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