Flexure of Concrete Beams Reinforced with Advanced Composite Orthogrids
Publication: Journal of Aerospace Engineering
Volume 10, Issue 1
Abstract
An experimental investigation was conducted to determine the flexural characteristics of advanced composite grid reinforced-concrete structures. Concrete beams reinforced with orthogonal grids composed of corrosion-resistant fiber-reinforced polymer composites (carbon/vinyl-ester and fiberglass/vinyl-ester) were compared to standard steel-reinforced beams. Flexure tests were performed on 26 0.762 mm (30 in.) long beams with a 0.1524 mm (6 in.) square cross section under four-point bending. The various test configurations incorporated #3 steel-reinforcing bars and/or composite grids with 0.0508 or 0.1016 mm (2 or 4 in.) spacing. The flexural strength, stiffness, and failure characteristics were evaluated by monitoring the load, deflection, and strain coupled with visual observation. The present study provides insight into the relevant load-transfer mechanisms, geometric issues, and dependence on material properties. The results show that the behavior of composite grid reinforced beams can be predicted with the same accuracy as traditional steel reinforcement enabling a simple, straightforward extension of existing design criteria. Composite grids designed and fabricated to have the same axial rigidity as steel rebar result in equal deflections for equal loads and significantly higher ultimate strengths, with reduced toughness due to the linear elastic characteristics of the reinforcement materials.
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 10 • Issue 1 • January 1997
Pages: 7 - 15
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Jan 1, 1997
Published in print: Jan 1997
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