CFRP strengthened openings in two-way concrete slabs – An experimental and numerical study

Enochsson, Ola; Lundqvist, Joakim; Täljsten, Björn; Rusinowski, Piotr; Olofsson, Thomas

doi:10.1016/j.conbuildmat.2006.06.009

Cited by 69 publications

(54 citation statements)

References 7 publications

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“…Conversely, large openings lead to significant reduction in both stiffness and rigidity of walls [4]. Recently, CFRP is increasingly being used as a means to increase strength of the existing RC structures because of its excellent characteristics such as the ease of installation, high resistance, high strength to weight ratio, and durability [5,6]. The American Concrete Institute code ACI 318M-14 [7] considers only RC bearing walls supported at the top and bottom (one way action).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of RC wall with opening strengthened by CFRP subjected to eccentric loads

2017

JCE

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Numerical analysis of RC wall with opening strengthened by CFRP subjected to eccentric loads Numerical analysis of the central hole in RC walls with and without CFRP, subjected to uniform eccentric vertical line load, is presented in this paper. Six half-scale wall panels were modelled using the ABAQUS software to estimate the strengthening effects. The analysis revealed that the load capacity of the wall in terms of maximum load carrying capacity is influenced by CFRP thickness. It was found that the variation of CFRP thickness greatly influences the ultimate load carrying capacity, crack patterns, principal plastic strain of concrete, and equivalent stress. Numerička analiza ab zida s otvorom ojačanim CFRP-om podvrgnutim ekscentričnim opterećenjima U radu je provedeno numeričko ispitivanje središnjeg otvora u ab zidovima s CFRP ojačanjem i bez njega podvrgnutim ekscentričnom vertikalnom opterećenju s linearnim prirastom. Šest zidnih ploča u mjerilu 1 : 2 modelirane su u računalnom programu ABAQUS u svrhu procjene učinka ojačanja. Analiza je pokazala da na nosivost zida u smislu maksimalnog opterećenja utječe debljina CFRP-a. Utvrđeno je da varijacija debljine CFRP-a ima značajan utjecaj na krajnju nosivost, pojavu pukotina, glavnu plastičnu deformaciju betona i ekvivalentno naprezanje.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of RC wall with opening strengthened by CFRP subjected to eccentric loads

2017

JCE

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“…The successful application of FRP to strengthen solid concrete walls has been achieved in several studies (Demeter, 2011), (Mohammed, 2013), (Li, 2010), (Li, 2013), (Dan, 2012), (Todut, 2015), (Antoniades, 2005), (Maadawy, 2009), (Enochsson, 2007), (Florut, 2014). The retrofitting was performed by means of Carbon Fibre Reinforced Polymers (CFRP) using Externally Bonded Reinforcement (EBR) technique for both increasing the shear strength and to stich the cracks.…”

Section: Strengthening Strategymentioning

confidence: 99%

Seismic Performance Of A Precast Reinforced Concrete Wall With Cut-Out Opening Retrofitted Using Carbon Fibre Strips

Fofiu

Bindean

Stoian

2015

Journal of Applied Engineering Sciences

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ABSTRACT:The Precast Reinforced Concrete Wall Panel (PRCWP) presented in this paper is part of an experimental study regarding the seismic performance of precast reinforced concrete wall panels, strengthening strategies and investigation on the weakening induced by modifying the opening in these elements due to architectural demands, change of function of buildings or other reasons. The element presented is 1:1.2 scale typical Reinforced Concrete Wall Panel with a window opening used in Romania, in which the opening was changed to a door opening due to comfort considerations. The specimen was subjected to cyclic loading with the lateral loads being applied in displacement control of 0.1% drift ratio. This simulates the shear behaviour of the element. After testing the unstrengthen element we proceed to retrofit it using Carbon Fibre Strips anchored with Carbon Fibre Mash. The purpose of the paper is to present the strengthening strategy and restore the initial load bearing capacity of the element or even increase it. The experimental results of strengthen and unstrengthen specimens will be presented.

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“…Also, an analytical model was able to capture the different slab bending actions in addition to the debonding failure of the strengthened slabs. Enochsson et al [14] showed the results of laboratory tests on 11 slabs with openings including six slabs strengthened with carbon fiber reinforced polymers (CFRPs) sheets. Strengthened slabs were compared with traditionally steel reinforced slabs and without openings in slab.…”

Section: Open Accessmentioning

confidence: 99%

Strengthening of RC Slabs with Symmetric Openings Using GFRP Composite Beams

et al. 2013

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This paper describes the results of experimental testing of glass fiber reinforced plastic (GFRP) composite beam strengthened reinforced concrete (RC) slabs with two symmetrical openings. Specimens, one-half scale, have been designed and fabricated to reflect the most common RC bathroom slab used in school buildings. The specimen had dimensions of 2000 mm (width) × 150 mm (thickness) × 3000 mm (length) were used with the two openings of 300 mm × 400 mm. The aim of this study is to investigate the most effective strengthening method using GFRP composite beams in slabs with openings for enhancing the load-carrying capacity and stiffness. Test results showed that the strengthened slabs seems to increase the load-carrying capacity by 29%, 21% and 12% over that of the control specimen for diagonal, parallel and surround strengthening respectively. Furthermore, test results showed that the diagonal-strengthened system is one of the most effective methods for strengthening an RC slab with openings in terms of load-carrying capacity, stiffness and crack patterns.

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CFRP strengthened openings in two-way concrete slabs – An experimental and numerical study

Cited by 69 publications

References 7 publications

Numerical analysis of RC wall with opening strengthened by CFRP subjected to eccentric loads

Numerical analysis of RC wall with opening strengthened by CFRP subjected to eccentric loads

Seismic Performance Of A Precast Reinforced Concrete Wall With Cut-Out Opening Retrofitted Using Carbon Fibre Strips

Strengthening of RC Slabs with Symmetric Openings Using GFRP Composite Beams

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