Exterior RC beam–column joints: New design approach

The paper proposes a method for the seismic design of external beam–column joints by considering that the load transferred from the linear elements to the joint is predominantly resisted by a diagonal strut mechanism. The work presented is intended not only to verify the validity of the proposed method, but also to identify means for its implementation that will maximize its effectiveness. These means are linked with structural characteristics such as the bond between concrete and the portion of the longitudinal linear element reinforcement extending into the joint, the method adopted for anchoring the beam reinforcement and the joint reinforcement arrangement. The effect of the above characteristics on structural behaviour is established by testing full-size beam–column joint specimens under cyclic loading; the results obtained show that the proposed method produces design solutions that fully satisfy the code performance requirements and are found consistent with already published experimental information.