Residual Strength and Crack Propagation of Reinforced Concrete Columns under High Temperatures


  • Sara Saad Faraj Civil Engineering Department, Mustansiriayh University, Iraq
  • Hadi Naser Ghadhban Almaliki Civil Engineering Department, Mustansiriayh University, Iraq
Volume: 13 | Issue: 5 | Pages: 11821-11828 | October 2023 |


In the present study, reinforced concrete columns with dimensions of 200×200×1200 mm were tested under static loading and high temperatures. In the experimental work, square cross-section columns with compressive strength of 28 MPa were tested up to failure. Mechanical properties such as compressive strength, were examined under static load and then under temperatures such as 500 and 800 °C. Column specimens with the same geometry and with concrete covers of 10 and 17 mm were also put under test. Mode of failure, ductility, stiffness, and energy dissipation for all tested specimens are discussed. The test results showed that the strength capacity of reinforced concrete columns was affected by the column cover. The increment in temperature led to a reduction in the strength-carrying capacity of the columns and increased the axial and lateral displacements. The static compressive strength was reduced by 36.84 and 48.81% when the applied temperature was 500 and 800 °C, respectively. The stiffness of the specimen with 17 mm cover was 29.27 and 46.86% less than that of 10 mm cover for axial and lateral displacement, respectively. Also, the specimen with 10 mm cover exhibited decreased energy dissipation by 1.69 and 12.54% for axial and lateral displacement.


residual column strength, column crack propagation, reinforced concrete column, high temperature, ductility, stiffness, energy dissipation, mode of failure


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TR 33 Assessment and repair of fire-damaged concrete structures. UK: Concrete Society, 1990.

B. Chen, C. Li, and L. Chen, "Experimental study of mechanical properties of normal-strength concrete exposed to high temperatures at an early age," Fire Safety Journal, vol. 44, no. 7, pp. 997–1002, Oct. 2009.

B. L. Williams, "Fire performance of FRP-strengthened reinforced concrete flexural members.," Ph.D. dissertation, Queen’s University, Kingston, Canada, 2004.

U. Schneider, "Concrete at high temperatures — A general review," Fire Safety Journal, vol. 13, no. 1, pp. 55–68, Apr. 1988.

G. A. Khoury, "Effect of fire on concrete and concrete structures," Progress in Structural Engineering and Materials, vol. 2, no. 4, pp. 429–447, 2000.

U. Schneider, "Modelling of concrete behaviour at high temperatures," in Design of structures against fire, 1986, pp. 53–69.

V. K. R. Kodur, F.-P. Cheng, T.-C. Wang, and M. A. Sultan, "Effect of Strength and Fiber Reinforcement on Fire Resistance of High-Strength Concrete Columns," Journal of Structural Engineering, vol. 129, no. 2, pp. 253–259, Feb. 2003.

B. O. Wu and Y. H. Li, "Experimental research on fire performance of axially restrained RC columns with L-shaped cross section," in Proceedings of the Fifth International Conference on Structures in Fire, 2008, pp. 451–462.

H. K. Alaa, "Structural Behavior of Eccentrically Loaded Reinforced Concrete Columns Exposed to Fire Flame," Ph.D. dissertation, Mustansiriayah University, Baghdad, Iraq, 2019.

F. Al-Naqeeb and H. Al-Thairy, "The behavior of reinforced concrete columns exposure to eccentric loads at high temperature," Journal of Physics: Conference Series, vol. 1895, no. 1, Feb. 2021, Art. no. 012055.

H. N. G. Al-Maliki, A. J. H. Alshimmeri, A. M. Ali, Y. M. Madhloom, and Y. Gamli, "Nonlinear Simulation Analysis of Tapered Reinforced Concrete Column (solid and Hollow) Behavior Under Axial Load," International Journal of GEOMATE, vol. 21, no. 86, pp. 131–146, 2019.

M. Baghdadi, M. S. Dimia, and D. Baghdadi, "A Parametric Study of Fire-Damaged Reinforced Concrete Columns under Lateral Loads," Engineering, Technology & Applied Science Research, vol. 12, no. 5, pp. 9113–9119, Oct. 2022.

A. N. Hassooni and S. R. A. Zaidee, "Behavior and Strength of Composite Columns under the Impact of Uniaxial Compression Loading," Engineering, Technology & Applied Science Research, vol. 12, no. 4, pp. 8843–8849, Aug. 2022.

F. Boursas, R. Boufarh, and B. Maghaghi, "The Influence of Slenderness in Steel and Composite Columns under Fire Conditions," Engineering, Technology & Applied Science Research, vol. 13, no. 1, pp. 10145–10150, Feb. 2023.

ACI Committee 318, ACI CODE-318-19(22): Building Code Requirements for Structural Concrete and Commentary (Reapproved 2022). ACI, 2020.


How to Cite

S. S. Faraj and H. N. G. Almaliki, “Residual Strength and Crack Propagation of Reinforced Concrete Columns under High Temperatures”, Eng. Technol. Appl. Sci. Res., vol. 13, no. 5, pp. 11821–11828, Oct. 2023.


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