Abstract
The use of Light-Weight Concrete (LWC) in modern construction has resulted in efficient designs and considerable cost savings by reducing structural own weight and supporting footings sections. The purpose of this paper is to investigate the Lap-Splice behavior between LWC and steel reinforcement (RFT). The tested specimens were divided into four groups to study the effect of main variables: steel reinforcement bar size, internal confinement (stirrups), splice length and concrete cover thickness. Four-point bending tests were carried out on test specimens to evaluate the performance of lap splices under pure bending. Bond behavior and failure modes were noted to be similar in the normal concrete and in the LWC. In tested beams, it was observed that the bar size has a significant influence on the mean bond stress in the splice. Improving radial tensile strength by using increasing stirrups number improves the bond behavior. The splice length up to 35 times bar diameter decreased the moment capacity of beam. The splice length of 55 times bar diameter results in the same capacity of the beam without any splice.
Highlights
In the last ten years, the interest in lightweight concrete “Light-Weight Concrete (LWC)” grows rapidly and it is widely used in building construction
This experimental program is conducted in order to study the behaviour of reinforced polystyrene lightweight concrete beams (LWC) with overlapped splices in the region of max positive tension and comparing them with similar normal weight concrete beams (NWC)
The spliced NWC beam and LWC beam had almost the same failure load which reflects that the splicing was sufficient to transfer loads
Summary
In the last ten years, the interest in lightweight concrete “LWC” grows rapidly and it is widely used in building construction. Adequate bond between lightweight concrete and reinforcing bars in a splice is an essential requirement in the design of reinforced concrete structure. Experimental tests were done and analytical equations were proposed by some researchers. More knowledge on the mechanical interaction “bond” between reinforcing bars and lightweight concrete is need [7], [8]. It is well known that there are only few experimental investigations about the performance of tension lap-splice in LWC [9], [10]. Twelve full-scale beam specimens (2000x300x200 mm) were tested in positive bending. The specimens of lap-splice series were tested with lap-spliced bars centred on the mid span in a region of constant positive bending. The main variables were, steel reinforcement bar size, internal confinement (stirrups), lap splice length and concrete cover. The lap splice is considered the most economic and the easiest way for splicing
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