An experimental study on two different strengthening techniques for RC frames

Erdem, Ibrahim; Akyüz, Uğurhan; Ersoy, Uğur; Özcebe, Güney

doi:10.1016/j.engstruct.2006.03.010

Cited by 112 publications

(56 citation statements)

References 11 publications

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“…Therefore, the wall behaves as a strut in the diagonal that is under compression, while detachment from the surrounding frame is observed at the other diagonal. The placement of CFRP along the two main diagonals of the wall allows the wall to undertake tensile stresses along the tensile diagonal, limiting deformation of the frame and increasing the resistance to lateral loads [21][22][23]. Several efforts have been made recently to understand the in-and out-of-plane behaviour of FRP infilled RC frames [3,[21][22][23][24][25] that resulted in the identification of two main failure modes for this retrofit method: (a) anchor failure; and (b) debonding.…”

Section: Introductionmentioning

confidence: 99%

FRP Strengthened Brick-Infilled RC Frames: An Approach for their Proper Consideration in Design

Spyrakos¹,

Maniatakis

Smyrou³

et al. 2012

TOBCTJ

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A considerable number of existing buildings in seismic prone countries has been constructed either based on earlier concepts for seismic design or without applying seismic provisions. As a consequence, their seismic upgrade is a matter of concern. In urban environments, these structures usually consist of reinforced concrete (RC) frames with brick infill walls. Their strengthening with traditional methodologies, such as concrete jackets and shear wall construction, often results in operation interruption and high cost. The present research examines the complex response of RC frames and brick infill walls strengthened with Fibre Reinforced Polymers (FRP), a recently proposed retrofit scheme that becomes attractive because of its low cost and ease of implementation. Instead of the commonly used pair of compression struts that models the infill wall, a multiple strut masonry panel element model with advanced constitutive laws is applied for the representation of the nonlinear response of the infill wall, while a tension tie is used to consider the FRP sheets contribution on the response. The parameters of the wall and the FRP elements that are used in the numerical model are calibrated against experimental results available in the literature for two-storey, one-bay reinforced concrete frames subjected to cyclic loading. The effectiveness of this innovative technique is presented considering the response of the masonry infilled RC frame with and without retrofit. By comparison of the results, conclusions are drawn concerning design procedures.

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Section: Introductionmentioning

confidence: 99%

FRP Strengthened Brick-Infilled RC Frames: An Approach for their Proper Consideration in Design

Spyrakos¹,

Maniatakis

Smyrou³

et al. 2012

TOBCTJ

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“…Studies on strengthening of masonry infilled walls with carbon fiber reinforced polymer (CFRP) (Antoniades et al, 2005;Erdem et al, 2006;Binici and Özcebe, 2006;Altın et al, 2008), shotcrete with mesh reinforcement (Kahn, 1984;Alcocer et al, 1996;Acun and Sucuoğlu, 2005;Korkmaz et al, 2010), steel plates (Taghdi et al, 2000a;2000b;Farooq et al, 2006), steel fiber reinforced mortar (Sevil et al, 2011) and prefabricated panel infills (Frosch et al, 1996a;1996b;Frosch, 1996;1999;Baran and Tankut, 2011a;2011b) can be found. In addition, innovative materials such as textiles (Papanicolaou et al, 2011), ferrocement (Topçu et al, 2005;Amanat et al, 2007), epoxy and mortar injection (ElGawady et al, 2004) have also been used in strengthening of the hollow brick infill walls.…”

Section: Introductionmentioning

confidence: 99%

Occupant friendly seismic retrofit by concrete plates

Baran

Aktas

2013

J. Zhejiang Univ. Sci. A

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An innovative occupant friendly retrofitting technique has been developed for reinforced concrete (RC) building structures with hollow brick infill walls used as partition walls which constitute the major portion of the existing building stock in Turkey. The idea is to convert the existing hollow brick infill wall into a load carrying system acting as a cast-in-place RC wall by reinforcing it with relatively thin concrete plates bonded to the mortar coated infill wall by use of tile adhesive and fixed by 6 (6 mm diameter) bolts. Test parameters were the shape and thickness of the plates, presence of reinforcement in plates, number and arrangement of 6 bolts. It was observed that lateral strength, stiffness, energy dissipation capacity, and ductility of the strengthened infill walls were improved and behaviour was enhanced by the proposed technique. Plates with two different basic shapes were used to strengthen the test specimens.

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“…The situation is quite different under seismic loading. Based on earlier studies [Fiorato et al, 1970;Mehrabi et al, 1996;Applied Technology Council, 1999;Dolsek and Fajfar, 2001;Zarnic et al, 2001;Erdem et al, 2006;Hashemi and Mossalam, 2006;Pinto and Taucer, 2006;Dolsek and Fajfar, 2008;Pujol and Fick, 2010;Cankaya, 2011], it is well known that infill walls change the strength, stiffness and deformation properties of the frame structures. Typically, the strength and stiffness of the frames increase and the average drifts decrease compared to those of the bare frames.…”

Section: Introductionmentioning

confidence: 99%