Effect of Fire on Structural Behavior of Normal and High Strength Concrete Beams

Authors: Alaa I. Arafa, Hemdan O. A. Said. Marwa A. M. Ali

Abstract:

This paper investigates and evaluates experimentally the structural behavior of high strength concrete (HSC) beams under fire and compares it with that of Normal strength concrete (NSC) beams. The main investigated parameters are: concrete compressive strength (300 or 600 kg/cm²); the concrete cover thickness (3 or 5 cm); the degree of temperature (room temperature or 600 ^oC); the type of cooling (air or water); and the fire exposure time (3 or 5 hours). Test results showed that the concrete compressive strength decreases significantly as the exposure time to fire increases.

Keywords: Experimental, fire, high strength concrete beams, monotonic loading.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1130539

References:

[1] Lambotte, H., and Taerwe, L. R., “Deflection and cracking of high-strength concrete beams and slabs.” SP127-7, Proceedings, High-Strength Concrete, 2nd Int. Symp. Berkeley, Calif., W.T. Hester, ed., ACI Farmington Hills, Mich., 1990, pp. 108-128.
[2] Samir, A. Ashour “Effect of compressive strength and tensile reinforcement ratio on flexural behavior of high-strength concrete beams”, Engineering Structures, 22 (2000), pp. 1145-1158.
[3] Young, J., Hoon-Gyu, P., Sung-Soo K., Jong-Hoe K., and Yong-Gon K.,"On the Ductility of High-Strength Concrete Beams" International Journal of Concrete Structures and Materials, Vol. 2, No.2, 2008, pp. 115~122.
[4] Ibrahim, H. H. H. and MacGregor, J. G., “Modification of the ACI Rectangular Stress Block for High-Strength Concrete,” ACI Structural Journal, Vol. 94, No. 1, 1997.
[5] Moetaz M. El-Hawary, Ahmed M. RagabS, Ahmed Abd El-Azim§ and Shadia Elibiarif “Effect of fire on flexural behaviour of RC beams” Bui/ding Research Center, Cairo, Egypt, Construction and Building Materials, Vol. 10, No. 2, 1996, pp. 147-150.
[6] Rahul P. Chadha, A R Mundhada “ Effect Of Fire On Flexural Strength Of Reinforced Concrete Beam” International Journal of Engineering Research & Technology (IJERT), Vol. 1 Issue 3, May - 2012 ISSN: 2278-0181
[7] E. G. Choi and Y. S. Shin (2010), “The structural behavior and simplified thermal analysis of normal- strength and high- strength concrete beams under fire”, Engineering Structures, 33 (2011), pp. 1123- 1132.