The influence of mechanical splices on the nonlinear behavior of reinforced concrete beams with finite element method

In Iran reinforced concrete are extensively used in construction. using rebar joint in this buildings is an unavoidable issue. mechanical splices is the common joint which used in constructions an the most important disadvantages of this joint is using big amount of rebar. Steel is a valuable material hence the optimum usage of it could be profitable for the next man kind generation an environment. One of the best approaches to use the optimum amount of rebar is to use mechanical splice in spite of overlap method. It has been recommended that to use mechanical splice in ACI 318 and the ninth issue of national building regulations. According to the problems of the operation issue in heavy concrete buildings due to thick rebar. Mechanical splices are the safe joints which could compensate other problems regarding to rebar density. In every concrete building 15% of used rebar will remains as overlap joint in concrete, therefore using mechanical splice could reduce the amount of rebar and it wastes. In this thesis Abaques software had been employed to analyze the reinforced concrete bar. The non-overlapped bars , mechanical splice equipped bars, and overlapped bars had been investigated in this study. To validate this research the problem had been analyzed experimentally by quick wedge method and straight sample.
In conclusion mechanical splice operation under stress is in good agreement with non-overlapped bars and will increase the load endurance as much as 15% in comparison with overlapped rebars.