Structural behavior of hybrid reinforced concrete beam-column joints under cyclic load: State of the art review
Wissam Nadir, Ammar Yasir Ali, Majid M.A. Kadhim
Abstract
This study aims to provide a review of the literature on the hybrid reinforced concrete beam-column joints that used steel fibers reinforced concrete (SFRC) or high-performance fibers reinforced cementitious composites (HPFRCC) in the joint region instead of conventional concrete. The results of the previous work indicated that using SFRC in the joint region of beam-column joints improves seismic performance, hence the transverse reinforcement spacing in the joint zone can be increased. In addition, employment of SFRC can reduce the damage in joints without a change in the failure mode. However, utilizing SFRC in most non-seismic detailed joint specimens was unable to prevent the development of diagonal cracks in the joint core, resulting in joint shear failure. On the other hand, HPFRCC performs better than SFRC due to its tensile strain-hardening characteristic. The presence of HPFRCC in the joint region of interior beam-column connection changes the mechanism of failure to flexural failure rather than joint shear failure in the non-seismic detailed specimens with conventional concrete. Furthermore, utilizing HPFRCC with Type 1 detail in accordance with ACI-ASCE 352 was recommended for the exterior beam-column joints.