Effect of Confining Reinforcement on Fire Behavior of Reinforced Concrete Columns: Experimental and Numerical Study

Chinthapalli, Hemanth Kumar; Agarwal, Anil

doi:10.1061/(asce)st.1943-541x.0002617

Cited by 13 publications

(4 citation statements)

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“…A ductile column even with a 6% drift (D-E6-A350) resisted almost the same load as a non-ductile column with no earthquake damage (ND-E0-A0). This behavior is understandable as the effect of the amount of confining reinforcement on the load-carrying capacity in fire conditions has been discussed in detail by Chinthapalli and Agarwal (2020).…”

Section: Axial Compression Response Of the Damaged And Heated Columnsmentioning

confidence: 98%

Fire performance of earthquake-damaged reinforced concrete columns: an experimental study

Chinthapalli

Agarwal

2021

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PurposeEarthquake tremors not only increase the chances of fire ignition but also hinder the fire-fighting efforts due to the damage to the lifelines of a city. Most of the international codes have independent recommendations for structural safety against earthquake and fire. However, the possibility of a multi-hazard event, such as fire following an earthquake is seldom addressed.Design/methodology/approachThis paper presents an experimental study of Reinforced Concrete (RC) columns in post-earthquake fire (PEF) conditions. An experimental approach is proposed that allows the testing of a column instead of a full structural frame. This approach allows us to control the loading and boundary conditions individually and facilitates the testing under a variety of these conditions. Also, it allows the structure to be tested until failure. The role of parameters, such as earthquake intensity, axial load ratio and the ductile detailing of the column on the earthquake damage and subsequently the fire performance of the structure, is studied in this research. Six RC column specimens are tested under a sequence of quasi-static earthquake loading, followed by combined fire and axial compression loading conditions.FindingsThe experiment results indicate that ductile detailed columns subjected to 4% or less lateral drift did not lose significant load-carrying capacity in fire conditions. A lateral drift of 6% caused significant damage to the columns and reduced the load-carrying capacity in fire conditions. The level of the axial load acting on the column at the time of earthquake loading was found to have a very significant effect on the extent of damage and reduction in column load capacity in fire conditions. The columns that were not detailed for a ductile behavior observed a more significant reduction in axial load carrying capacity in fire conditions.Research limitations/implicationsThis study is limited to columns of 230 mm size due to the limitations of the test setup. The applicability of these findings to larger column sections needs to be verified by developing a numerical analysis methodology and simulating other post-earthquake-fire tests available in the literature.Originality/valueThe experimental procedure proposed in this paper offers an alternative to the testing of a complete structural frame system for PEF behavior. In addition to the ease of conducting the tests, the procedure also allows much better control over the heating, structural loading and boundary conditions.

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Section: Axial Compression Response Of the Damaged And Heated Columnsmentioning

confidence: 98%

Fire performance of earthquake-damaged reinforced concrete columns: an experimental study

Chinthapalli

Agarwal

2021

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“…Las propiedades térmicas del hormigón, como la conductividad térmica y el calor específico, no dependen en gran medida del grado del hormigón. Se encuentra que la cantidad de refuerzo de confinamiento afecta la capacidad de carga a temperaturas elevadas más significativamente que a temperatura ambiente (Kumar & Agarwal, 2020).…”

Section: Propiedades Térmicas Del Hormigónunclassified

“…El comportamiento del hormigón armado a altas temperaturas es diferente al de las condiciones ambientales, lo que se debe principalmente a la disminución gradual de la resistencia del material cuando incrementa la temperatura. Además, al aumentar la presión del poro y la tensión térmica desigual provocan desconchado del hormigón (Kumar et al, 2013;Kumar & Agarwal, 2020).…”

Section: Introductionunclassified

Efectos Del Fuego Sobre La Resistencia De Elementos Estructurales De Hormigón Armado: Una Revision De Literatura

et al. 2021

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El fuego en la estructura hace que aumente la temperatura de la superficie del hormigón, reduciendo así su resistencia a la compresión, flexión y el módulo elástico. Aunque el hormigón tiene un conductor más pobre que el acero, la alta temperatura constante en la superficie provoca el calentamiento gradual en su capa interior. Como material de construcción, el hormigón se usa ampliamente debido a su alta resistencia al fuego, es esencial para resistir uno de los desastres más severos que una estructura puede soportar en su vida. El presente documento tiene como objetivo realizar una revisión sistemática de los efectos que tiene el fuego en las propiedades mecánicas y térmicas de las estructuras de hormigón armado. Se revisaron 50 artículos publicados en base de datos indexadas entre los años 2011 y 2021, distribuidos de la siguiente manera: 28 en Scopus, nueve en Web of Science, ocho en Scielo, tres en ScienceDirect y dos en EBSCO, referentes al hormigón resistente al fuego, temperaturas altas, propiedades mecánicas y conductividad térmica. Para poder comprender el impacto que tiene el fuego en la resistencia de elementos estructurales de hormigón armado se presentaron los resultados de estudios elaborados en el ámbito. Se concluye que los principales efectos del fuego sobre el hormigón armado fueron: 1) disminución en la adherencia entre el hormigón y el acero 2) rotura del hormigón y 3) reducción de la resistencia del hormigón y el acero. Palabras claves: conductividad térmica – efecto del fuego en el hormigón armado – propiedades mecánicas del hormigón armado

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“…Buch and Sharma [18,19] conducted experiments on the RC column subjected to fire and developed an empirical model to predict the behavior of RC columns under fire. Chinthapalli and Agarwal [20] studied the effect of confinement on the behavior of axially loaded RC columns under compression subjected to elevated temperature. The experimental results were simulating numerically and found good agreement.…”

Section: Introductionmentioning

confidence: 99%

Residual load carrying capacity of reinforced concrete cylinders after heating at elevated temperature

et al. 2020

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The present research work is investigating the behavior of reinforced concrete (RC) cylinders after exposure to elevated temperatures. Reinforcement was done by using the longitudinal bars with closely spaced lateral ties (i.e. confinement). Experiments were carried out on the RC cylinders subjected to a single heating-cooling cycle of elevated temperature ranging from 200 to 800 °C with an interval of 200 °C for a holding time of 3 h. The crack patterns, color change, spalling and residual load carrying capacity of RC cylinders after exposure to elevated temperature have been observed. The residual load carrying capacity of RC cylinders has been compared with the load carrying capacity of control specimens at ambient temperature. The percent reduction in residual load carrying capacity after heating at 200 °C, 400 °C, 600 °C, and 800 °C temperature is 24.5%, 38.8%, 63.3%, and 83.7% respectively as compared with the load carrying capacity at ambient temperature. The finite element modeling (FEM) has been carried out to observe the thermal stresses and strains induced in the confined RC cylinders. Experimental observations of thermal strains and those obtained by the numerical model showed a good agreement. The scanning electron microscopy (SEM) has also been carried out to study the changes in the microstructure of confined high grade concrete and it was observed that the micro-cracks and pores increase and become more pervasive with increase in temperature.

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Effect of Confining Reinforcement on Fire Behavior of Reinforced Concrete Columns: Experimental and Numerical Study

Cited by 13 publications

References 10 publications

Fire performance of earthquake-damaged reinforced concrete columns: an experimental study

Fire performance of earthquake-damaged reinforced concrete columns: an experimental study

Efectos Del Fuego Sobre La Resistencia De Elementos Estructurales De Hormigón Armado: Una Revision De Literatura

Residual load carrying capacity of reinforced concrete cylinders after heating at elevated temperature

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