Bond Performance of Concrete Members Reinforced With FRP Bars

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Title: Bond Performance of Concrete Members Reinforced With FRP Bars

Author(s): T. Kanakubu, K. Yonemaru, H. Fukuyama, M. Fujisawa, and Y. Sonobe

Publication: Special Publication

Volume: 138

Issue:

Appears on pages(s): 767-788

Keywords: bonding; bond stress; cantilever beams; cracking (fracturing); fiber reinforced plastics; loading tests; reinforced concrete; tests; reinforcing steels; shear strength; Structural Research

Date: 9/1/1993

Abstract:
An experimental program consisting of three series of tests was conducted to investigate the bond performance of concrete members reinforced with FRP bars. First, a simple bond test was performed using several types of FRP bars. This test was carried out by pulling out a single bar located near the surface of the concrete block. The test objectives were to evaluate the bond splitting strength of FRP reinforced concrete without lateral reinforcement and to establish a standard test method for bond splitting. Test results show that the bond splitting strength can be estimated using the ratio of lug height to diameter of FRP bars. In the second test, a bond splitting test was conducted on cantilever-type specimens. These were modeled to exhibit a stress condition similar to an actual structure. The test objectives were to study the results of the simple bond test and evaluate the increment of the bond splitting strength caused by lateral reinforcement. From the test results, the tendency of the bond splitting strength without lateral reinforcement is equal to that obtained from the first test. The increment of the strength caused by lateral reinforcement can be evaluated in terms of its percentage and elastic modulus. Finally, an antisymmetrical loading test for actual beams reinforced with FRP bars was carried out. The bond performance obtained for the longitudinal bars shows a good correlation with the results obtained from the former two tests.