Title:
Glass Fiber-Reinforced Polymer Bars as Shear-Friction Reinforcement for Concrete Cold Joints
Author(s):
Basel H. Aljada, Amr El Ragaby, and Ehab F. El-Salakawy
Publication:
Structural Journal
Volume:
121
Issue:
6
Appears on pages(s):
47-60
Keywords:
cold joint; composite elements; glass fiber-reinforced polymer (GFRP); pushoff; shear connectors; shear friction
DOI:
10.14359/51740861
Date:
11/1/2024
Abstract:
Interface shear transfer is vital to maintain the structural integrity
of concrete composite elements. Therefore, shear connectors are
provided at the concrete joint interface to maintain such integrity.
Due to its high tensile strength and non-corrodible nature, glass
fiber-reinforced polymer (GFRP) reinforcement can be used as
shear connectors in composite elements, particularly those in harsh
environments. Fifteen pushoff specimens were constructed and
tested to failure. The specimen consisted of two L-shaped concrete
blocks cast at two stages to provide the cold joint interface. The
test parameters were the type, shape, and ratio of shear-friction
reinforcement and concrete strength. It was demonstrated that
GFRP-reinforced concrete (RC) specimens with reinforcement
ratios of 0.36% or more could resist the shear-friction stresses similarly to their steel-RC counterparts. Also, increasing the concrete strength increased the shear-friction capacity significantly. Moreover, the design model in the Canadian Highway Bridge Design
Code resulted in very conservative predictions.