Performance of Steel Spliced Reinforced Concrete Beams Having Construction Joints.

Many problems may occur during constructing the reinforced concrete structures during the implementation process, so this study has focused on one of the problems that often occur during implementation, especially in large buildings where these building needs to pump large quantities of concrete at one time, and this is often not possible, so it creates an interface between the old and new concrete is called a construction joint. Also, large areas need reinforcement of large lengths, and here we will need reinforcement splices to obtain the required lengths. Many studies examine these two problems separately, but few of them mean studying them together, that is, the construction joint occurs at the area of reinforcement splices. Therefore, this study dealt with an experimental program from nine concrete beams reinforced with steel to study the structural performance of reinforced concrete elements in the presence of a construction joint (having various interfaces 45º inclined and L-shaped), with reinforcement splice of three different lengths. The results showed that the presence of a construction joint with a reinforcement splice of sufficient appropriate splice length reduced the load capacity by 37% for the inclined joint beam while an insufficient splice length of 180 mm reduced the load capacity by 59% compared to the reference. It is shown that concrete beams lose their ductility in the presence of the construction joint at the splice reinforcement splice reinforcement region. Also, it should be considered the outcome of this study when designing mega-reinforced concrete structures. [ABSTRACT FROM AUTHOR]