Full-Scale Shaking Table Tests on a Substandard RC Building Repaired and Strengthened with Post-Tensioned Metal Straps

Garcia, Reyes; Hajirasouliha, Iman; Guadagnini, Maurizio; Helal, Yasser; Jemaa, Yaser; Pilakoutas, Kypros; Mongabure, Philippe; Chrysostomou, Christis Ζ.; Kyriakides, Nicholas; İlki, Alper; Budescu, Mihai; Ţăranu, Nicolae; Ciupala, Mihaela Anca; Torres, Lluís; Saiidi, Mehdi S.

doi:10.1080/13632469.2013.847874

Cited by 48 publications

(25 citation statements)

References 38 publications

(28 reference statements)

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“…The steel straps used in these studies are recycled steel straps which are commonly used as packing strands for exporting good crates. The benefit of using steel straps as confining material, aside from its cost effectiveness, is it allows post-tensioning confining pressure around concrete which ensure fully effective use of the confining material [6][7][8]. As being reported previously, the passive type of confining materials which are activated by the dilation of the concrete, not reaching their ultimate strain at the ultimate failure.…”

Section: Introductionmentioning

confidence: 89%

Innovative Concrete Repairing Technique Using Post Tensioning Steel Straps

et al. 2017

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Abstract. In this paper, innovative technique using low-cost recycled steel straps confinement to repair load-induced damaged high-strength concrete (HSC) columns were studied. This paper explains the effects of repairing technique using post tensioning steel straps. A series of experimental test was carried out to investigate the stress-strain relationships of such concrete. A total of 6 HSC columns were compressed 50% of their ultimate strength, then repaired by using steel straps. The proposed repairing technique significantly improved the performance of damaged concrete columns, in both strength and ductility. It was evidenced from this study that the steel strapping confining technique is effective in repairing of damaged HSC columns but ensured reasonable operating costs.

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Section: Introductionmentioning

confidence: 89%

Innovative Concrete Repairing Technique Using Post Tensioning Steel Straps

et al. 2017

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“…General geometry and reinforcement detailing of BANDIT building (units: mm), partially adapted from Garcia et al (2014a) The beams had a cross section of 260×400 mm in the X direction and 260×300 mm in the Y direction (see Post-tensioned bolts (CEN 2004a). The top beam reinforcement of the 1 st floor joints was anchored using 90° bends and U-shaped hooks, which provided adequate anchorage according to EC2 requirements.…”

Section: Figmentioning

confidence: 99%

“…Experimental research has confirmed the effectiveness of the PTMS technique at enhancing the capacity of columns under compression (Moghaddam et al 2010), beams with short lap-splices (Helal et al 2014) and substandard beam-column joints subjected to cyclic load (Helal 2012). More recently, the technique was proven extremely effective at enhancing the seismic behaviour of a full-scale PTMS-retrofitted RC building subjected to low and medium-intensity (up to PGA=0.35g) shake table tests (Garcia et al 2014a). However, the behaviour of PTMS-retrofitted structures subjected to severe shaking (PGA>0.40g) still needs to be investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The article details the adopted retrofitting strategy, and discusses global and local results from the shake table tests on the retrofitted structure. This study is part of a comprehensive research effort focusing on the seismic retrofitting of substandard RC buildings using PTMS (Garcia et al 2014a) and FRP composites (Garcia et al 2014b(Garcia et al , 2015.…”

Section: Introductionmentioning

confidence: 99%

“…The structure was subjected to five Phases of shaking table tests at the CEA/EMSI laboratory facilities (Saclay, France) as part of the EU-funded BANDIT project. The initial shake table tests were reported in Garcia et al (2014a) and investigated the behaviour of the bare (Phase 1) and PTMS-retrofitted building under low and medium-intensity shaking (Phases 2 and 3) of up to PGA=0.35g.…”

Section: Introductionmentioning

confidence: 99%

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

Garcia

Pilakoutas

Hajirasouliha

et al. 2015

Bull Earthquake Eng

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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 three-dimensional shake table tests up to PGA=0.60g without failure. Moreover, the retrofitting intervention enhanced the interstorey drift ratio capacity of the 1 st and 2 nd 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.

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Rehabilitation of earthquake damaged external RC beam‐column joints by joint enlargement using prestressed steel angles

Shafaei

Hosseini

Marefat

et al. 2016

Earthq Engng Struct Dyn

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Summary The effectiveness of a rehabilitation method based on joint enlargement using prestressed steel angles to enhance the seismic behavior of damaged external reinforced concrete beam‐column joints was experimentally investigated. Three half‐scale joints having either non‐seismic or seismic reinforcement details were tested both before and after rehabilitation by applying lateral cyclic loading of increasing amplitudes. Two defects were considered for the two non‐seismic units, being the absence of transverse steel hoops and insufficient bond capacity of beam bottom steel reinforcing bars in the joint panel zone. The damaged specimens were rehabilitated by injecting epoxy grout into existing cracks and installing stiffened steel angles at the re‐entrant corners of the beam‐column joint, both above and below the beam, that were mounted and held in place using prestressed high‐tensile strength bars. The test results indicated that the seismic performance of the rehabilitated specimens in terms of strength, stiffness, and ductility was fully recovered and comparable with the performance of the seismically detailed specimen. Copyright © 2016 John Wiley & Sons, Ltd.

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Full-Scale Shaking Table Tests on a Substandard RC Building Repaired and Strengthened with Post-Tensioned Metal Straps

Cited by 48 publications

References 38 publications

Innovative Concrete Repairing Technique Using Post Tensioning Steel Straps

Innovative Concrete Repairing Technique Using Post Tensioning Steel Straps

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

Rehabilitation of earthquake damaged external RC beam‐column joints by joint enlargement using prestressed steel angles

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