The load carrying capacity of reinforced concrete columns subjected to elevated temperature using simplified method

Abstract

The present work proposes a method to determine the load-carrying capacity of the reinforced concrete column at elevated temperatures. The method uses the zone method mentioned in Eurocode to determine the temperature-dependent material properties of steel and concrete. Later the design equations, as per Indian standard guidelines, are used to determine the load-carrying capacity of the column. The loads considered here include both axial loads as well as uniaxial moments. The results obtained are validated with experimental data from the literature. Once P<inf>u</inf>and M<inf>u</inf>are determined using temperature-dependent materials properties, interaction curves are plotted at various temperatures mentioned in the standard time-temperature curve. The results obtained are validated against the experimental results from the literature. The Paper also investigates the behaviour of reinforced columns by varying design parameters like the size of the column and the grade of concrete. The work also discusses the relevancy of the 500° Isotherm method and the zone method mentioned in Eurocode when designing columns at elevated temperatures per Indian Standard guidelines. © 2023 Elsevier Ltd. All rights reserved.