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A combined FRP and selective weakening retrofit for realistic pre-1970's RC structures

Pohoryles, DA; Rossetto, T; Melo, J; Varum, H; (2017) A combined FRP and selective weakening retrofit for realistic pre-1970's RC structures. In: (Proceedings) ICONHIC 2016: 1st International Conference on Natural Hazards & Infrastructure, 28-30 June 2016, Chania, Crete. (In press). Green open access

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Abstract

A large proportion of existing reinforced concrete (RC) buildings is vulnerable to brittle failure mechanisms in earthquakes due to inadequate seismic detailing. Efficient and practical retrofit solutions are required to prevent future losses. To date, most experimental studies in the field of seismic retrofit with fibre - reinforced polymer (FRP) have concentrated on simplified beam - column joint specimens. These often ignore the real practical challenges incurr ed by the presence of a floor slab and transverse beams in retrofitting deficient specimens . In this study, the results from four cyclic tests on realistic full - scale typical pre - 1970’s beam - column joints with s labs and transverse beams are presented . Two realistic retrofit scheme s using carbon CFRP sheets are proposed. The first scheme aims to improve the duc tility of the deficient joint by providing continuity of the column flexural strengthening through the joint. The second scheme includes selective weakening of the slab and aims to relocat e the failure mechanism to the beams . The significance of the presence of the slab on the global beha viour of the sub - assembly is confirmed by the experimental findings. The res ults highlight that the proposed combined retrofit and selective weakening scheme can successfully increase the ductility of the joint by activating deformation in the beams.

Type: Proceedings paper
Title: A combined FRP and selective weakening retrofit for realistic pre-1970's RC structures
Event: ICONHIC 2016: 1st International Conference on Natural Hazards & Infrastructure, 28-30 June 2016, Chania, Crete
Location: Chania, Crete
Dates: 27 June 2016 - 29 June 2016
Open access status: An open access version is available from UCL Discovery
Publisher version: http://iconhic2016.com/
Language: English
Additional information: For copyright information, contact papers@ICONHIC2016.com
UCL classification: 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/1540115
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