Investigation of Bond in Concrete Member With Fiber Reinforced Plastic Bars


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Title: Investigation of Bond in Concrete Member With Fiber Reinforced Plastic Bars

Author(s): E. Makitani, I. Irisawa, and N. Nishiura

Publication: Special Publication

Volume: 138


Appears on pages(s): 315-332

Keywords: bonding; bond strength; carbon; fiber reinforced plastics; fibers; glass; lap connections; pullout tests; reinforcing steels; slippage; tensile strength; Structural Research

Date: 9/1/1993

Bond tests with beam specimens were performed to research the bond characteristics of fiber reinforced plastic bars in concrete members that were made of such continuous fibers as carbon, aramid, glass, and vinylon, as well as epoxy resin matrix, especially when the ends of the bars were not reinforced. It was observed that bars whose surfaces were processed into a spiral shape or covered by cohesive grains of sand did not pull out if the bond length was more than 40d, where d was the diameter of the fiber reinforced plastic bar. Based on these tests, using carbon fiber reinforced plastic bars, tests of lap splice joints were performed by arranging an anchoring position in the center of a truss-type concrete specimen. It was found that the unit bond strength increased as the length of the lap splice joint increased, but that it decreased for lap splice lengths between 40d and 60d.