Research Article | OPEN ACCESS
Strength Characteristics of Concrete Beams Reinforced with Steel Bars of Equivalent Area but Different Diameters
1A.W. Adekeye and 2P.O. Awoyera
1Department of Civil Engineering, Polytechnic Offa, PMB 420, Kwara State
2Department of Civil Engineering, College of Engineering, Covenant University, PMB 1023, Ota, Ogun State, Nigeria
Research Journal of Applied Sciences, Engineering and Technology 2015 7:765-769
Received: April ‎17, ‎2015 | Accepted: May ‎10, ‎2015 | Published: November 05, 2015
Abstract
Contractors occasionally substitute reinforcement bars during construction works, perhaps as a result of unavailability of the design-specified bars. As a result, this study have explored the basis, extent and the conditions for the mutual substitution of reinforcing bar groups of equivalent area but different bar diameters in reinforced concrete beams. A total of (20) concrete beams including the control beams were cast. These comprise (2) each of 100 mm×100 mm×500 mm and 150 mm×150 mm×750 mm beams as plain concrete (control beams) and (2) each of 100 mm×100 mm×500 mm and 150 mm×150 mm×750 mm beams were reinforced in turn with 20 mm, 16 mm, 12 mm and 10 mm bar diameters. The beams were subjected to centre-point loading using bending testing machine, in accordance with BS 1881-118 and with the load and compressive strain recorded to the point of failure. The results of the test beams showed that the greatest difference in the area of reinforcement between beams reinforced with 9Y12 bars (bar area = 1020 mm2) and 3Y20 bars (bar area = 943 mm2) is 7.5%. The results also showed that given the same area of steel in a cross section, the section with the greater number of bars has higher bending strength. It was also deduced that an increase in the area of reinforcement would cause a disproportionate increase in the strength of the beam.
Keywords:
Bending, concrete beams, flexural strength, plain concrete, reinforcement,
Competing interests
The authors have no competing interests.
Open Access Policy
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Copyright
The authors have no competing interests.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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