Journal of
Civil Engineering and Construction Technology

  • Abbreviation: J. Civ. Eng. Constr. Technol.
  • Language: English
  • ISSN: 2141-2634
  • DOI: 10.5897/JCECT
  • Start Year: 2010
  • Published Articles: 140

Full Length Research Paper

Fire resistance of reinforced concrete rigid beams

Mohammed Mansour Kadhum
  • Mohammed Mansour Kadhum
  • Civil Department, College of Engineering, Babylon University, Iraq.
  • Google Scholar

  •  Received: 01 April 2014
  •  Accepted: 04 August 2014
  •  Published: 31 August 2014


The effect of burning by fire flame on the behavior and load carrying capacity of rectangular reinforced concrete (RC) rigid beams is addressed in this paper. Reduced scale beam models (which are believed to resemble as much as possible field conditions) were suggested. Five end restrained beam specimens of casting and testing. The specimens were subjected to fire flame temperatures ranging from (25-750°C) at age of 60 days, two temperature levels of 400 and 750°C were chosen with exposure duration of 1.5 h. The rectangular reinforced concrete beam (2250×375×375 mm) (length× width× height respectively) were cast and subjected to fire. Test results indicate remarkable reduction in the ultrasonic pulse velocity and rebound number of the rigid beams cooled in water were (2-5%) more than the rigid beam specimens cooled in air. Load-deflection curves indicate deleterious response to the fire exposure. Also, it was noticed that the maximum crack width increases with increasing fire temperature.


Key words: Reinforced concrete (RC), rigid beams, fire flame, cracking, nominal moment capacity, fire resistance.