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首页> 外文期刊>Journal of structural fire engineering >Is it reasonable to use high-strength concrete columns under fire conditions?
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Is it reasonable to use high-strength concrete columns under fire conditions?

机译：在火灾条件下使用高强度混凝土柱是合理的吗？

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Purpose - This paper aims to answer two questions. First, are there any differences in the fire performance of columns made of normal and of high-strength concrete? Second, under which circumstances does the fire design govern the cross-sectional dimensions of concrete columns? Is it feasible to replace columns out of normal strength concrete by more slender high-strength concrete columns? Design/methodology/approach - The author conducted numerical studies using the finite element code "Infocad" of the German company "Infograph". The studies included the effect of different parameters on the fire performance of columns out of normal and high-strength concrete, i.e. the load ratio and eccentricity, boundary conditions and times of fire exposure. Findings - Results from the numerical investigations showed that high-strength concrete columns suffer much more from heating than normal strength concrete columns. This is the outcome of the unfavourable mechanical properties of high-strength concrete at elevated temperatures. Although the relative fire performance of columns out of high-strength concrete is worse than that of columns out of normal strength concrete, initial load reserves are beneficial to achieve even high fire ratings. Originality/value - Many researchers addressed in experimental and numerical studies the fire performance of columns out of normal and high-strength concrete. A special emphasis was often laid on the spalling of fire-exposed high-strength concrete. However, there are no systematic investigations when the fire design governs the cross-sectional dimensions of high-strength concrete columns. Based on a previous comparison of the relative fire performance of columns out of normal and high-strength concrete, this paper, hence, addresses the question whether there is a reasonable lower limit for the use of these columns. This is an important aspect for designers since there is a tendency to replace columns out of normal strength concrete by columns out of high-strength concrete. Higher concrete strengths allow for smaller cross sections of the columns, and designers may, hence, increase the usable space of buildings.
机译：目的 - 本文旨在回答两个问题。首先，在正常和高强度混凝土的柱子的火灾性能方面是否存在差异？其次，消防设计在哪种情况下，防治混凝土柱的横截面尺寸？通过更多细长的高强度混凝土柱更换正常强度混凝土的柱子是可行的吗？设计/方法/方法 - 作者使用德国公司“infograph”的有限元代码“infocad”进行了数值研究。研究包括不同参数对正常和高强度混凝土柱的火灾性能的影响，即负载比和偏心，边界条件和火灾曝光时间。结果 - 来自数值研究的结果表明，高强度混凝土柱从加热比正常强度混凝土柱中遭受更多损失。这是高强度混凝土在升高温度下的不利机械性能的结果。虽然柱子的高强度混凝土的相对火灾性能比正常强度混凝土的柱子更糟糕，但初始载荷储量有利于实现甚至高火额定值。原创性/价值 - 在实验和数值研究中解决的许多研究人员在正常和高强度混凝土中柱子的火灾性能。特别强调展开了剥落的火灾高强度混凝土。然而，火灾设计控制高强度混凝土柱的横截面尺寸时，没有系统的调查。基于前一个比较正常和高强度混凝土中柱的相对火灾性能，因此，解决这些列的合理下限是否有合理的下限。这是设计人员的一个重要方面，因为倾向于通过高强度混凝土中的柱子替换出正常强度混凝土的柱子。更高的混凝土强度允许柱子的较小横截面，因此设计人员可能会增加建筑物的可用空间。

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