%0 Generic
%A Ragni, L
%A Freddi, F
%A Tubaldi, E
%A Dall'Asta, A
%C Bari, Italy
%D 2011
%F discovery:1575831
%I ANIDIS
%K Vulnerability of low ductility r.c. frames, seismic retrofit, fragility curves, elasto-plastic devices.
%T Probabilistic performance assessment of low ductility r.c. frames retrofitted by elasto-plastic braces
%U https://discovery.ucl.ac.uk/id/eprint/1575831/
%X The paper illustrates a probabilistic methodology for assessing the vulnerability of existing r.c. buildings with  limited ductility capacity and retrofitted by means of dissipative braces. The methodology is based on the  development of single component and system fragility curves before and after the retrofit. The proposed approach  allows to highlight the possible changes in the most significant collapse modalities before and after the retrofit and  to evaluate the effectiveness of the retrofit by taking into account the probabilistic properties of the seismic  behaviour of the considered systems.  A benchmark 2-dimensional reinforced concrete frame with low ductility capacity is considered as case study. The  frame is designed for gravity-loads only and does not comply with modern anti-seismic code requirements. It is  retrofitted by introducing elasto-plastic dissipative braces designed for different levels of their target base-shear  capacity, following a design method involving the pushover analysis of the system before and after retrofit. The  obtained results show that the use of braces yields a significant increase in the seismic capacity, though an  increased dispersion of the behaviour is observed in the retrofitted system.
%Z This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.