Correlation between Roles of Transverse Reinforcement and Steel Fibers in Confining Tension Lap Splices in High-Strength Concrete

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Title: Correlation between Roles of Transverse Reinforcement and Steel Fibers in Confining Tension Lap Splices in High-Strength Concrete

Author(s): Bilal S. Hamad, Shadi S. Najjar, and Ghaida’ K. Jumaa

Publication: Structural Journal

Volume: 100

Issue: 1

Appears on pages(s): 19-24

Keywords: high-strength concrete; lap splice; reinforcement.

DOI: 10.14359/12435

Date: 1/1/2003

Abstract:
Two research programs were recently conducted to assess the effect of confinement provided for tension lap splices anchored in high-strength concrete (HSC) beam specimens on bond strength of the splices and mode of failure of the beams. In each program, 12 full-scale beams were tested and three bar sizes were checked (20, 25, and 32 mm). Beams of the same bar size in the two programs were identical except for the type of confinement used in the splice region. In one program, steel fibers of different volume fractions were used. In the second program, transverse reinforcement was placed in various amounts. Test results of both programs indicated positive effects of the provided confinement on the bond strength of the tension lap splices and on the mode of failure. The objective of the paper was to use the results of the two programs to perform a correlation between the amount of transverse reinforcement placed in the splice region and the volume fraction of fiber reinforcement added in the splice region during the casting procedure needed to improve the bond capacity and the ductility of the mode of failure of tension lap splices embedded in high-strength concrete.


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