The behavior of steel structures subjected to seismic actions depends directly on the connections behavior. There are two current tendencies for ensuring the structural ductility: allowing the formation of plastic hinges in the beams by using reduced beam sections or reduced web sections or by ensuring the plastic hinge formation in the connection by using dissipative elements. This paper presents a new perspective regarding the energy dissipation mechanism formation within the beam-to-column connection. The design of connections capable of dissipating large amounts of energy, with an acceptable strength and ductile behavior is a real challenge for engineers. Sustainability is a big advantage for these connections. Another big advantage is the possibility of restoring the functionality of the damaged construction in a short time interval and with reduced costs. The introduction of connections with demountable energy dissipative plates can be a step forward in designing new beam-to-column connections for steel structures.
Connection behaviour is the most important factor in the steel structures behaviour subjected to cyclic actions. To avoid formation of plastic hinges in the column, it is stiffened with additional diagonal stiffeners. This paper presents an FEM analysis of extended end-plate beam-to-column connections with diagonal stiffeners subjected to the cycling loading proposed by FEMA350/SAC protocol. Models were analysed with the ANSYS finite element analysis program. The study analyses the energy dissipation capacity, the stress and deformation state. The parameters are the direction of singular diagonal stiffeners, influence of crossing diagonal stiffeners and lack of stiffeners. The design of the connections is based on the strong column-weak beam principle.
Even if it has been shown that steel beam-to-column connections with extended end plate has a semi-continuous behaviour, many structural analyses consider these joints either fixed or pinned. For advanced structural analysis of connections and frames it is necessary to know the behaviour of the joint. The characteristics of the joint can be identified on the moment-rotation curve. This paper presents a comparative study of the moment-rotation curve for a standardized node calculated according Eurocode 3, and obtained by FEM analysis using IDEASTATICA and ANSYS finite element analysis program. The analyses were performed for the models with non pre-tensioned bolts. Also, an additional study was performed in ANSYS to identify the influence of the thickness of the extended end plate.
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