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Local and Global Response Parameters in Seismic Risk Assessment of RC Frames Retrofitted by BRBs

Freddi, F; Tubaldi, E; Dall'Asta, A; Ragni, L; (2013) Local and Global Response Parameters in Seismic Risk Assessment of RC Frames Retrofitted by BRBs. In: Modena, C, (ed.) (Proceedings) ANIDIS 2013 - XV Convegno, 30 June 2013 – 4 July 2013, Padova, Italy. Green open access

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Abstract

This paper deals with the seismic performance and risk assessment of existing reinforced concrete (RC) buildings with limited ductility retrofitted by means of buckling restrained braces (BRBs). Two different approaches for evaluating the seismic vulnerability and risk before and after retrofit are introduced and analyzed. These approaches involve the use of different categories of engineering demand parameters (EDPs) for the system response assessment: global EDPs, that permit to obtain a synthetic description of the system behavior at a reduced computational cost, and local EDPs, more accurate in describing the response of the frame elements and of the BRBs, though more demanding from a computational point of view. The effect of the EDPs choice is analyzed by considering a two-dimensional RC frame designed for gravity-loads only as case study. The frame is retrofitted by introducing elasto-plastic dissipative braces designed for different levels of base shear capacity. The results of the study show that the use of global EDPs leads to a significant overestimation of the retrofit effectiveness in terms of both vulnerability and risk reduction. If a risk-based design is carried out for the retrofit system, braces with significantly lower dimensions are obtained by using global EDPs instead of local EDPs.

Type: Proceedings paper
Title: Local and Global Response Parameters in Seismic Risk Assessment of RC Frames Retrofitted by BRBs
Event: ANIDIS 2013 - XV Convegno, 30 June 2013 – 4 July 2013, Padova, Italy
Location: Padova, Italy
Dates: 30 June 2013 - 04 July 2013
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.anidis.it/
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Reinforced Concrete Frames, Fragility, Vulnerability Assessment, Seismic Retrofit, Dissipative Braces
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1575835
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