Seismic retrofitting of RC buildings using CFRP and post-tensioned metal straps: shake table tests

Article


Garcia, Reyes, Pilakoutas, Kypros, Hajirasouliha, Iman, Guadagnini, Maurizio, Kyriakides, Nicholas and Ciupala, A. 2015. Seismic retrofitting of RC buildings using CFRP and post-tensioned metal straps: shake table tests. Bulletin of Earthquake Engineering.
AuthorsGarcia, Reyes, Pilakoutas, Kypros, Hajirasouliha, Iman, Guadagnini, Maurizio, Kyriakides, Nicholas and Ciupala, A.
Abstract

This article examines the effectiveness of two innovative retrofitting solutions at enhancing the seismic behaviour of a
substandard reinforced concrete building tested on a shake table as part of the Pan-European funded project BANDIT. To
simulate typical substandard construction, the reinforcement of columns and beam-column joints of the full-scale structure
had inadequate detailing. An initial series of shake table tests were carried out to assess the seismic behaviour of the bare
building and the effectiveness of a first retrofitting intervention using Post-Tensioned Metal Straps. After these tests,
columns and joints were repaired and subsequently retrofitted using a retrofitting solution consisting of Carbon Fibre
Reinforced Polymers and Post-Tensioned Metal Straps applied on opposite frames of the building. The building was then
subjected to unidirectional and three-dimensional incremental seismic excitations to assess the effectiveness of the two
retrofitting solutions at improving the global and local building performance. The article provides details of the above
shake table testing programme and retrofitting solutions, and discusses the test results in terms of the observed damage,
global damage indexes, performance levels and local strains. It is shown that whilst the original bare building was
significantly damaged at a peak ground acceleration (PGA) of 0.15g, the retrofitted building resisted severe threedimensional
shake table tests up to PGA=0.60g without failure. Moreover, the retrofitting intervention enhanced the
interstorey drift ratio capacity of the 1st and 2nd floors by 160% and 110%, respectively. Therefore, the proposed dual
retrofitting system is proven to be very effective for improving the seismic performance of substandard buildings.

JournalBulletin of Earthquake Engineering
ISSN1573-1456
1570-761X
Year2015
PublisherSpringer Verlag
Accepted author manuscript
Web address (URL)http://dx.doi.org/10.1007/s10518-015-9800-8
Publication dates
Print01 Aug 2015
Publication process dates
Deposited25 Aug 2015
Accepted27 Jul 2015
FunderEuropean Community Seventh Framework
Commissariat à l’Energie Atomique
Copyright informationThe final publication is available at Springer via http://dx.doi.org/10.1007/s10518-015-9800-8
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