Title:
Bond Strength and Load Distribution of Composite GFRP
Reinforcing Bars in Concrete
Author(s):
B. Benmokrane, B. Tighiouart, and 0. Chaallal
Publication:
Materials Journal
Volume:
93
Issue:
3
Appears on pages(s):
254-259
Keywords:
anchorage (structural); beams (supports); bonding; bond stress;
composite construction (concrete and plastic); embedment; glass fibers;
pullout tests; reinforced plastic; reinforcing steels.
DOI:
10.14359/9810
Date:
5/1/1996
Abstract:
The objective of this study was to investigate the bond strength of glass fiber reinforced plastic (GFRP) reinforcing bars in concrete. Twenty concrete beams reinforced with four nominal diameters from 12.7 to 25.4 mm of GFRP and steel reinforcing bars were tested to determine the bond strength of GFRP reinforcing bars in comparison with steel reinforcing bars. Additionally, the distribution of tensile and bond stresses along the embedment length of GFRP reinforcing bars was investigated by five pull-out tests using instrumented 19.1 -mm-diameter GFRP reinforcing bars compared with steel reinforcing bars in concrete. Only one type of GFRP reinforcing bar was used in this study. Test results indicate that the diameter effect on bond observed for steel reinforcing bars is also present for GFRP reinforcing bars. The bond strength of GFRP reinforcing bars is lower (60 to 90 percent) than that of steel reinforcing bars. The bond strength from beam tests is lower (55 to 95 percent) than that from pullout tests. Furthermore, it was found that the distribution of bond stress along the embedment length of GFRP reinforcing bars is nonlinear: