Title:
Fiber-Reinforced Polymer Bond Test in Presence of Steel and Cracks
Author(s):
Mehdi Taher Khorramabadi and Chris J. Burgoyne
Publication:
Structural Journal
Volume:
108
Issue:
6
Appears on pages(s):
735-744
Keywords:
anchorage regions; average bond stress-slip model; bond behavior; cracked regions; fiber-reinforced polymer
DOI:
10.14359/51683372
Date:
11/1/2011
Abstract:
The understanding of failure modes of flexurally fiber-reinforced polymer (FRP)-strengthened reinforced concrete (RC) beams that initiate away from the beam’s end requires a realistic knowledge of the bond behavior between the FRP and the concrete between cracks in the presence of steel. The conventional method used to obtain a bond characteristic is to pull a bonded FRP from a concrete block, which effectively simulates the conditions in the anchorage regions of a strengthened beam. The boundary conditions in the anchorage regions differ significantly from those in the regions between the cracks, so a different model must be used. A new bond test method is proposed and tests are carried out to mimic the conditions in both the cracked and anchorage regions when steel is present. The test results showed that not only do the bond models differ significantly in the cracked and anchorage regions, but also the steel and its bond stress affect the bond behavior.