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doi:10.3850/978-981-08-7920-4_S2-S09-cd
Bond Studies of Hooked Bars Confined with Steel Fibers in High Strength Concrete
Bilal S. Hamad1 and Elias Y. Abou Haidar2
1Department of Civil & Environmental Engineering, American University of Beirut, Beirut, Lebanon.
2Libanconsult AGM, Beirut, Lebanon.
ABSTRACT
The effect of steel fibers dispersed in the concrete mix in improving the bond performance and
ductility of the failure mode of hooked bar anchorages installed in high strength concrete (HSC)
beam-column connections, was evaluated by testing twelve beam-column type specimens. The
specimen simulated the rigid connection of a vertical cantilever beam to a base column. The
intended nominal concrete strength was 60 MPa. The tensile beam reinforcement consisted of
two bars anchored in the column outside the column reinforcement cage using hooked-bar
anchorages. The variables used in the study were the beam bar size (16, 25, or 32mm) and
the volume fraction of steel fibers added and dispersed in the concrete mix (0, 0.5, 1.0, or 1.5%).
Analysis of the test results revealed that steel fibers were effective in increasing the anchorage
capacity and the ductility of the load-deflection history of HSC specimens with steel fibers as
comparedwith companion specimens identical in geometry and bar size butwithout steel fibers.
Keywords: High strength concrete, Steel fibers, Connections, Anchorages, Bonding, Bond stress.
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