The Flexural Behavior of Confined Beams Reinforced with Tension Lap Splice and Cast with Fibers Concrete
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Abstract
The function of the (lap splice) technique in structural building has become widely used in structural buildings. This study aims to investigate the flexural behaviour of the confined concrete beams with tension spliced bars. Eight concrete beams, each and every one measured 150 × 220 ×1200 mm, were tested under two-point loads. All the spliced beams were built up with the same splice length 300 mm and 20 mm concrete cover. The study parameters were the type of the concrete (normal of fibres), the confinement of the splice area, and the forms and proportions of fibres (hooked-steel and polypropylene fibres). The beams were divided into seven spliced beams, and the eighth one was manufactured with a beam which was built up with non-spliced bars for comparing purposes. The result showed that the use of the fibres concrete led to improving the overall structural behaviour compared to the normal concrete. Adding hooked-steel fibres, in general, resulted in a significant improvement in the bond strength and the stress transmission efficiency, leading to an enhancing in the flexural properties. In contrast, adding the polypropylene fibres increased the ability to deformation as it controlled the micro-cracks with limited effect on strength development. Confining the spliced zone prevented the lateral expansion of the spliced bars, led to a significant improvement in the post-cracking load, the ultimate strength and the toughness. The use of 0.4% of steel fibers resulted in the most balanced behaviour in terms of ductility and toughness. Compared with the non-spliced beam the study findings demonstrated that using the variables made the structural behaviour of the spliced beams closer to the non-spliced beam.
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