Seismic Response of MR- Frames with Semi-Rigid Connections - F1

The work presented is aimed at the investigation of the influence of beam-to-column connection typologies on the seismic response of MR-Frames. The investigated typologies are three partial strength connections whose structural detail has been designed by means of hierarchy criteria based on the component approach, aiming to obtain the same flexural resistance. They are characterized by different location of the weakest joint component, leading to different values of joint rotational stiffness and plastic rotation supply and affecting the shape of the hysteresis loops governing the dissipative capacity. An appropriate modelling of structures is needed to accurately represent both strength and deformation characteristics, especially with reference to partial-strength connections where the dissipation of the earthquake input energy occurs. Beam-to-column joints are modelled by means of rotational inelastic spring elements located at the ends of the beams whose moment- otation curve is characterized by a cyclic behaviour accounting for stiffness and strength degradation and pinching phenomenon. The parameters characterizing the joints cyclic hysteretic behaviour have been calibrated on the base of experimental results aiming to the best fitting. Successively, the prediction of the structural response of a MR-Frames equipped with such connections has been carried out by means of dynamic analyses.

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