Strengthening of Beam Column Joints With Modified Reinforcement Technique

Abstract

In a beam column joint to meet the requirement of strength, stiffness and ductility under dynamic loading one of the existing solution is inclusion of high percentages of transverse hoops in the core of joints. The most important factor affecting the shear capacity of joints are the concrete compressive strength, joint aspect ratio, anchorage of beam longitudinal reinforcement and amount of stirrups inside the joint. The beam moment which induced during earthquake motion on the beam can produce high shear forces and bond breakdown into the joint resulting in cracking of the joints. Unsafe design and detailing within the joint region jeopardizes the entire structure, even if other structural members conform to the design requirements. Modified reinforcement technique (MRT) using crossed inclined bar at beam column junction is investigated in our work and it has been found that its presence introduces an additional mechanism for shear transfer. Modified Reinforcement Technique (MRT) can be proposed as a feasible solution for increasing the shear capacity and stiffness of the joint under dynamic loading.