Abstract
Abstract The results of an experimental program conducted on seventeen simply supported concrete beams to study the effect of transverse reinforcement on the behavior of the lap splice of a steel reinforcement in tension zones in high-strength concrete beams are presented. The parameters included in the experimental program were the concrete compressive strength, the lap splice length, the amount of transverse reinforcement provided within the splice region, and the shape of the transverse reinforcement around the spliced bars. The experimental results showed that the displacement ductility increased and the mode of failure changed from a splitting bond failure to a flexural failure when the amount of the transverse reinforcement in the splice region increased, and the compressive strength increased up to 100 MPa. The presence of the transverse reinforcement around the spliced bars had a pronounced effect on increasing the ultimate load, the ultimate deflection, and the displacement ductility. The prediction of maximum steel stresses for spliced bars using the ACI 318-05 building code was compared with the experimental results. The comparison showed that the effect of the transverse reinforcement around spliced bars has to be considered into the design equations for lap splice length in high-strength concrete beams.
Highlights
An adequate bond between concrete and reinforcing bars in a splice is an essential requirement in the design of reinforced concrete structures
The main object of the research program reported in this paper is to study the effect of a transverse reinforcement on the strength, mode of failure and displacement ductility of a tension lap splice anchored in high-strength concrete beams with a concrete compressive strength ranging from 60 to 100 MPa
2) For the splices confined by a transverse reinforcement, by increasing the concrete compressive strength, the mode of failure was more ductile, and the final mode of failure changed to a flexural failure for a beam specimen with a compressive strength of 100 MPa
Summary
An adequate bond between concrete and reinforcing bars in a splice is an essential requirement in the design of reinforced concrete structures. The type, spacing and shape of the transverse reinforcement in the splice region among other variables were considered He concluded that there is a drastic increase in the ductility of beams when a transverse reinforcement is used. Azizinamini et al (1999, 1993) studied the effect of high-strength concrete on a bond using beam splice tests They noted that the bearing capacity of concrete increased (related to fc’) more rapidly than tensile strength The main object of the research program reported in this paper is to study the effect of a transverse reinforcement on the strength, mode of failure and displacement ductility of a tension lap splice anchored in high-strength concrete beams with a concrete compressive strength ranging from 60 to 100 MPa. To meet the objective, seventeen high-strength concrete beam specimens were tested. The prediction of the maximum steel stresses in the spliced bars using the ACI Building Code was compared with the experimental results
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