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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Upgrading Reinforced Concrete Columns by Jacketing with Carbon Fiber-Reinforced Plastic (CFRP) Sheets
Author(s): M. N. Darwish
Publication: Special Publication
Appears on pages(s): 488-502
Keywords: column (composite); concrete; epoxy resins; fiber-
Abstract:Experimental studies are reported on upgrading the load carrying capacity of reinforced columns by jacketing with carbon fiber reinforced plastic (CFRP) flexible wraps. Several square columns with medium high strength concrete (cube strength = 64 MPa) were tested under concentric compression. The studied variables include: different upgrading configurations (continuous wrapping all over the height, discontinuous straps, straps concentrated at end zones); volume of wraps; and pre-loading prior to wrapping to simulate in situ strengthening process in practice. Effective wrapping provided lateral confinement to enhance the concrete compressive strength and the load capacity of the columns, in addition to the improvement of the ductility. With higher levels of confinement the axial capacity was further enhanced. Besides, effective retrofitting of preloaded columns restored and even increased their load carrying capacity over that of the original columns. It seems better to use effective full height wraps for enhancement of both strength and ductility and to help restrain against buckling of longitudinal bars, however the effect of confining the columns’ ends cannot be overlooked. The confined concrete strength from tests was compared with those estimated by certain empirical models and the comparisons were favorable in many cases. Other conclusions are also drawn.
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