The beam-column joints often behave as semi-rigid, which means the beam transmits bending moment to the column proportionally to the joint stiffness. For this classification, the resistance of the joints is compared with the bending moment resistance of the connected beam. The code also classifies the joints according to their moment resistance as full resistance joints, partial resistance joints or simple joints. The European code of design classifies joints as rigid, semi-rigid or simple joints according to the joint stiffness, presenting some boundaries in which the joint and the beam stiffness are compared. A joint between a horizontal beam that supports vertical loads connected to a column transmitting internal forces through the joint. In the case of structural buildings, the most common joint is the beam-column joint. In the steel construction industry, joints are the most critical points in the whole structure. The coupons were tested and the results were implemented in the numerical model of the joint, in an attempt to bring it closer to the experimental results of the tested joints. In this work, some coupons were extracted from the HAZ of the beam-column joint. As long as the joint implies a welding process, there is a concern related to how the mechanical properties in the heat-affected zone (HAZ) influence the behavior of the joint. For this second option, it is necessary to know the actual mechanical properties of the material. There are two different ways to bridge the gap: experimental testing on the actual beam column joints involving tubular sections or numerical modelization, typically by means of finite element analysis. When one of the members involved in the joint is a hollow section (i.e., a tube) there is a lack of information for the specific components present in the joint. Eurocode 3 establishes the component method to analytically characterize the structural joints between beam and columns.
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March 2023
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