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doi:10.3850/978-981-08-7920-4_S2-S08-cd
Bond Studies of Hooked Bars Confined with Steel Fibers in Normal 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 objective of the research studywas to assess the effect of steel fibers dispersed in the concrete
mix in improving the bond performance of hooked bars and ductility of the failure mode of
beam-column connections. Twelve beam-column specimens with an intended nominal concrete
strength of 28MPa were tested. The specimen simulated the rigid connection of a cantilever
beamto a column. It consisted of a vertical beamelement anchored in a base column. The tensile
beam reinforcement consisted of two bars anchored in the base column outside the column
reinforcement cage using hooked-bar anchorages designed to ensure bond-splitting failure
before the steel yielded. The variables were the beam bar size (16, 25, or 32mm) and the volume
fraction of steel fibers placed 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 specimens with steel fibers as compared with
companion specimens identical in geometry and bar size but without steel fibers.
Keywords: Reinforced concrete, Steel fibers, Connections, Anchorages, Bonding, Bond stress.
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