Title:
Investigation on End-Anchorage of SRG Composites Externally Bonded to a Concrete Substrate
Author(s):
Xingxing Zou, Chris Moore, and Lesley H. Sneed
Publication:
Symposium Paper
Volume:
345
Issue:
Appears on pages(s):
156-168
Keywords:
anchorage, bond, concrete, SRG composite
DOI:
10.14359/51731578
Date:
2/1/2021
Abstract:
Externally bonded (EB) steel reinforced grout (SRG) composites have the potential to improve the flexural
and shear performance of existing concrete and masonry structural members. However, one of the most commonly
observed failure modes of SRG-strengthened structures is due to composite debonding, which reduces composite
action and limits the SRG contribution to the member load-carrying capacity. This study investigated an endanchorage
system for SRG strips bonded to a concrete substrate. The end anchorage was achieved by embedding the
ends of the steel cords into the substrate. Nineteen single-lap direct shear specimens with varying composite bonded
lengths and anchor binder materials were tested to study the effectiveness of the end-anchorage on the bond
performance. For specimens with relatively long bonded length, the end-anchorage slightly improved the performance
in terms of peak load achieved before detachment of the bonded region. Anchored specimens with long bonded length
showed notable post-detachment behavior. Anchored specimens with epoxy resin achieved load levels significantly
higher than the peak load before composite detachment occurred. For specimens with relatively short bonded length,
the end-anchorage provided a notable increase in peak load and global slip at composite detachment. A generic load
response was proposed for SRG-concrete joints with end anchors.