Reinforced concrete is used since more than a century, but in first constructions there was not particular care in the design of beam and column intersections, i.e. joint panels. For this reason today there is a need to improve the knowledge on their behavior, especially in seismic prone areas, for new constructions and to define design specifications for their retrofit in existing structures. The scope of this work is to analyze the seismic behavior of corner-positioned RC beam-column joints and to allow evaluating the strength hierarchy (in the framework of capacity design) for beam-column joints, particularly focusing on corner-positioned joints. This is the basis for a good practice in the retrofit deign. Modern design codes are based on these design principles and it is crucial to correctly detect the behavior of beam-column joint panels because this impacts strongly on the ductility of the global structure. A simplified analytical model of joint behavior is proposed to identify the potential failure modes (namely shear or flexural failures of columns or beams, failure of cracked joint, bond failure of passing through bars) in terms of capacity, to identify the first one occurring and the order of the others, potentially aiming to govern the strength hierarchy. In the broader work of the authors, the present contribution focuses on T-shaped joints (external corner-positioned). Numerical outcomes are shown and compared to experimental results.
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