Faculty Publications
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Item The load carrying capacity of reinforced concrete columns subjected to elevated temperature using simplified method(Elsevier Ltd, 2023) Akkannavar, C.; Prashanth, M.H.; Banasode, S.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 Puand Muare 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.Item Computation of Stress Block Parameters of Rectangular RC Column at Elevated Temperatures(Springer Science and Business Media Deutschland GmbH, 2024) Akkannavar, C.; Prashanth, M.H.; Korpalli, S.A.This paper proposes an approach to determine the load carrying capacity of Reinforced Concrete (RC) columns at elevated temperatures using Stress block parameters. The method uses a Strain distribution diagram for the RC column with various cases of eccentricity and utilizes maximum strain and minimum strain mentioned as per Eurocode. A modified strain distribution diagram is plotted using temperature-dependent strain properties, and a modified distribution diagram calculates stress at that level. Stress block parameters (C1, C2) are computed using these values, which can be used to determine Pu and Mu for various cases of eccentricities. Further, these values can be used to plot interaction curves for multiple temperatures following the standard time–temperature curve. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Simplified Method to Predict Residual Strength of Reinforced Concrete Columns Under Natural Fire Conditions(Springer, 2024) Akkannavar, C.; Prashanth, M.H.; Joshi, C.Studies on the Reinforced Concrete (RC) columns under natural fire conditions are critical since the failure of columns leads to progressive failure of the building. Many experimental and analytical studies have been conducted to investigate the columns under fire conditions. Most studies have investigated fire conditions by utilizing standard time–temperature relationships such as ISO-834, ASTEM E119, and other nominal fire curves. This paper presents a simplified method to evaluate the axial capacity of RC columns subjected to natural or realistic fires. A parametric natural fire model is developed from EN.1991.1.2.2002 guidelines, considering important parameters into account to define the natural fire curve. Thermal analysis is carried out using the finite element software SAFIR to determine the temperature distribution within the column’s cross-section. The mechanical properties of concrete and steel change with an increase in temperature. The reduction factors for the compressive strength of concrete and the yield strength of steel at elevated temperatures are derived from Eurocodes. Using updated temperature-dependent strength parameters for concrete and steel, the capacity of a column is estimated. The proposed methodology can be used to estimate the residual strength of RC columns for realistic fire situations. © The Institution of Engineers (India) 2024.