Abstract
Compression splices are widely used in compression members such as columns in multi- story buildings. There are efficient design equations for compression splice of reinforcement embedded in conventional concrete proposed by design codes of practice. However, there is no design equation for compression splice in compression members made of reactive powder concrete (RPC). So, it is required to introduce a design equation to calculate the steel bars lap splice length of RPC compression members. In this study, an experimental work was conducted to investigate the effect of different variables on compression splices strength. These variables were compressive strength of concrete, transverse reinforcement amount, splice length, yield stress of reinforcement and spliced rebar diameter. The experimental results showed that; Increase in the yield stress of reinforcing bars, length of spliced bars and compressive strength of concrete result in increasing in splice strength. Meanwhile, increase in diameter of reinforcing bars result in decreasing in compression splice strength. The increase in the amount of transverse reinforcement has insignificant effect on compression spliced strength of rebar. Finite element analysis was used to analyze the tested specimens and compared between numerical and experimental result was carried out. The numerical and experimental ultimate load and load-deflection behavior is very close to each other. Finite element method was used to investigate a wide range of experimental variables values through a parametric analysis. A new proposing equation for compression splicing of rebar in RPC column is presented in this research.
Highlights
Recent studies have been concerned with improving the properties of concrete mixtures at hardened state
The results show that the compression splice strength of steel bars is more than that of GFRP bars
The effect of different parameters was investigated in the experimental work; compressive strength of concrete, yield stress of spliced bars, transverse reinforcement ratio in the region of spliced bars, diameter of splicing rebar and length of reinforcing splicing rebar.The following sections discuss the variables effect on spliced strength and load deflection curves of reactive powder concrete (RPC) columns
Summary
Recent studies have been concerned with improving the properties of concrete mixtures at hardened state. RPC is proposed as a new type of concrete mixture to improve the mechanical properties of concrete for cast-in-place and precast applications [1]. Reinforcing bars are stocked by the suppliers in a length of 18 m for bars from No. to No. and in 6 or 12 m lengths for smaller sizes. It is frequently required to splice bars especially in compression members as columns in multi-story buildings. Splice mechanism represented by transfer the stresses between the lap splice steel bars through sufficient length of splice. The lapped bars are usually bonded using welding or by steel wired 2
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