@article{ref1,
title="Is it reasonable to use high-strength concrete columns under fire conditions?",
journal="Journal of structural fire engineering",
year="2021",
author="Bahr, Oliver",
volume="12",
number="4",
pages="471-485",
abstract="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 &quot;Infocad&quot; of the German company &quot;Infograph&quot;. 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. <br><br>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. <br><br>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.<p /> <p>Language: en</p>",
language="en",
issn="2040-2317",
doi="10.1108/JSFE-02-2021-0011",
url="http://dx.doi.org/10.1108/JSFE-02-2021-0011"
}