Behaviour of Fire Exposed Reinforced Concrete Rigid Beams with Restrained Ends
Main Article Content
Abstract
This paper is devoted to investigate the effect of burning by fire flame on the behavior and load carrying capacity of rectangular reinforced concrete rigid beams. Reduced scale beam models (which are believed to resemble as much as possible field conditions) were suggested. Five end restrained beam specimens were cast and tested. The specimens were subjected to fire flame temperatures ranging from (25-750) ºC at age of 60 days, two temperature levels of 400ºC and 750ºC were chosen with exposure duration of 1.5 hour. The cast rectangular reinforced concretebeam (2250×375×375 mm) (length× width× height respectively) were subjected to fire. Results indicate remarkable reduction in the ultrasonic pulse velocity and rebound number of the rigid beams after cooled in water were (2-5 %) more than 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.
Article Details
How to Cite
Publication Dates
References
ACI 318-08, 2008, "Building Code Requirements for Reinforced Concrete", American Concrete Institute, Detroit.
ACI Committee 211, 1997, "Standard Practice for Selecting Proportions for Normal, Heavyweight, and Mass Concrete (ACI 211.1-91)", American Concrete Institute, Michigan, U.S.A.
ASTM, Test Method E119-01, 2001,"Standard Methods of Fire test of Building Construction and Materials", American Society for Testing and Materials, West Conshohocken, PA.
BS-8110 part 2, 1997, "Design Curves of Concrete Strength with Temperature".
Dong, Y. and Prasad, K., 2008, "Thermal and Structural Response of a Two-Story, Two-Bay Composite Steel Frame under Fire Loading", Proceedings of the Combustion Institute, 8pp.
Georgali, B., Tsakiridis, P.E., 2005,"Microstructure of Fire- Damaged Concrete", Case study, Cement and Concrete Composite, pp225-259.
Hsu, H.J, and Lin,C.S, 2006, "Residual Bearing Capabilities of Fire-Exposed Reinforced Concrete Beams", International Journal of Applied Science and Engineering, Chaoyang University of Technology, ISSN 1727-239.
Ingham, J., and Tarada, F., 2007, "Turning up the Heat-Full Service Fire Safety Engineering for Concrete Structures", Durable Concrete, October, pp.27-30.
Iraqi Organization of Standards, IOS 45: 1984; for Aggregate.
Iraqi Organization of Standards, IOS 5: 1984; for Portland Cement.
Khan, M. R., and Royles, R., 1986, "Post – Heat Exposure Behavior of Reinforced Concrete Beams", Magazine of Concrete Research, Vol.38, No.135, June, pp.59-66.
Kodaira, A., Fujinaka, H., Ohashi, H. and Nishimura, T., 2004, “Fire Resistance of Composite Beams Composed of Rolled Steel Profile Concreted between Flanges”, Fire Science and Technology 23(3), 192-208.
Neville, A. M., 1995, "Properties of Concrete", Longman Group, Ltd., 4th and Final Edition, 1995, pp.388.
Shettey, M. S., 1988, "Concrete Technology Theory and Practice", Third Edition, PP.361.