Title:
Anchorage of Surface Mounted FRP Reinforcement
Author(s):
A. Khalifa; T. Alkhrdaji; A. Nanni; and S. Lansburg
Publication:
Concrete International
Volume:
21
Issue:
10
Appears on pages(s):
49-54
Keywords:
anchorage; bond; fiber reinforced polymers; flexural strength; reinforced concrete; repairs; shear strength; strengthening
DOI:
Date:
10/1/1999
Abstract:
This article presents a novel anchor system called U-anchor that can be used to significantly improve the performance of surface mounted reinforcement for concrete/masonry made of fiber reinforced polymer (FRP) composites. In applications where bond and/or development length of FRP are critical, the U-anchor prevents debonding of the reinforcement. The anchor is based on the idea of embedding a bent portion of the end (or near the end) of the FRP reinforcement into a preformed groove in the concrete/masonry. The groove is filled with a viscous paste and may or may not include an FRP bar. The U-anchor is compatible with any external FRP strengthening system and my avoid high stress concentration and durability concerns comparing to traditional mechanical anchors made of steel plates and bolts. It can be used with sheets and pre-cured laminates that are unbonded or fully bonded to concrete. Laboratory testing confirms the excellent performance of the U-anchor system.