eprintid: 1575831
rev_number: 20
eprint_status: archive
userid: 608
dir: disk0/01/57/58/31
datestamp: 2017-10-01 01:55:25
lastmod: 2020-02-12 16:14:19
status_changed: 2018-05-04 12:19:39
type: proceedings_section
metadata_visibility: show
creators_name: Ragni, L
creators_name: Freddi, F
creators_name: Tubaldi, E
creators_name: Dall'Asta, A
title: Probabilistic performance assessment of low ductility r.c. frames retrofitted by elasto-plastic braces
ispublished: pub
divisions: UCL
divisions: A01
divisions: B04
divisions: C05
divisions: F44
keywords: Vulnerability of low ductility r.c. frames, seismic retrofit, fragility curves, elasto-plastic devices.
note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: 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.
date: 2011-09-22
date_type: published
publisher: ANIDIS
official_url: http://convegno.anidis.it/index.php/anidis/2011/index
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1424064
lyricists_name: Freddi, Fabio
lyricists_id: FFRED33
full_text_status: public
place_of_pub: Bari, Italy
event_title: XIV National Conference ANIDIS, L'Ingegneria sismica in Italia
event_location: Bari, Italy
event_dates: 18 September 2011 - 22 September 2011
institution: XIV National Conference ANIDIS, L'Ingegneria sismica in Italia
book_title: Proceedings of the XIV National Conference ANIDIS
citation:        Ragni, L;    Freddi, F;    Tubaldi, E;    Dall'Asta, A;      (2011)    Probabilistic performance assessment of low ductility r.c. frames retrofitted by elasto-plastic braces.                     In:  Proceedings of the XIV National Conference ANIDIS.    ANIDIS: Bari, Italy.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1575831/1/Freddi_Ragni%20et%20al.%202011_ANIDIS_Probabilistic%20performance%20assessment%20of%20low%20ductility%20r.c.%20frames%20retrofitted%20by%20elasto-plastic%20dissipative%20braces.pdf