An enhanced component based model for steel links in hybrid structures

In the present paper the development, calibration and experimental validation of an enhanced component based model of a dissipative steel link connecting a reinforced concrete wall and a steel gravity frame is presented. The structural consists in an hybrid coupled shear wall (HCSW), developed within the INNOHYCO project (Dall’Asta et al., 2014), obtained coupling an RC wall with two side steel columns by means of steel links where the energy dissipation takes place. The experimental results carried on a subsystem representing a portion of the shear wall, the dissipative link and one side column, showed that the global dissipative behavior is strongly affected by the characteristics of the link-to-column connection. In particular the prestressing force of the seat angle connection bolts influence in a decisive way the dissipative capacity of the system, especially for the low amplitude cycle. For this reason, an experimental campaign on two different hybrid system containing the dissipative element and the aforementioned connections has been carried out. A non-linear cyclic component- based model of the entire sub-assemblage is then developed and calibrated on the base of experimental results