A Review on Structural Behavior, Analysis and Design of RC Dapped End Beams

Abstract

This paper represents a historical review of the theoretical and experimental studies carried out previously to study the behavior of reinforced concrete dapped end beams. Prestressing is one of the techniques that have been adopted to enhance the performance of such members. Furthermore, a dapped end needs to be strengthened due to various reasons to improve its performance. Consequently, the review has been extended to include studied such aspects. It was concluded that the ultimate capacity enhanced by reducing the shear-slenderness ratio and horizontal tension reaction and increasing the strength of concrete and fiber content. In addition, nib main reinforcement affects significantly the mode of failure, cracking and ultimate load. However, it was observed that the inclined hanger stirrups or bent performed better than that of vertical alignment and that the prestressing level and strand profile affect the shear capacity and performance significantly. On the other hand, it was found that the external bonding CFRP is the most adopted strengthening material and that the STM (Strut-and-Tie Model) approach results in better predictions of the ultimate load than the shear-friction method. Moreover, directions for future work are proposed, several conclusions have been drawn and a comprehensive list of references is provided.