GNGTS 2021 - Atti del 39° Convegno Nazionale

GNGTS 2021 S essione 2.2 264 the Δ P f in all the structures. Results highlight that the self-centring behaviour is particularly sensitive to the number of storeys and tends to reduce with the increasing height of MRFs equipped with the proposed connections. The following conclusions can be drawn: 1) the seismic performances of the structures equipped with damage-free self-centring column base connections are significantly enhanced, as demonstrated by the significant residual drift reductions, at both the design based and maximum credible earthquake; 2) The self-centring capability of the adopted connections in reducing the residual interstorey drifts is particularly influenced by the number of storeys of the structures; 3) The effectiveness of the adopted connection in reducing the residual interstorey drifts is relevant at the lower storeys, while it reduces at higher storeys, resulting in a reduction of the self-centring capability as evidenced by the 8- storey frames. References Latour M, Rizzano G, Santiago A, Da Silva L. Experimental response of a low-yielding, self-centering, rocking column base joint with friction dampers, Soil Dyn. Earthq. Eng. 2019; 116 : 580–592. Elettore E, Freddi F, Latour M, Rizzano G. Design and analysis of a seismic resilient steel moment resisting frame equipped with damage free self-centring column bases, J. Constr. Steel Res. 2020. EN 1998-1, Eurocode 8: Design of structures for earthquake resistance – Part 1: General rules, seismic actions and rules for buildings, 2004, European Committee for Standardization, Brussels. Fig. 3 - IDA Results: Comparison of the maximum residual interstorey drifts in terms of median values (50% fractile) among all ground motions: (a) 3-4; (b) 3-6; (c) 3-8; (d) 5-4; (e) 5-6; (f) 5-8; (g) 8-4; (h) 8-6; (i) 8-8.