Axially Loaded Steel Columns Strengthened with CFRP

Kalavagunta, Sreedhar; Naganathan, Sivakumar; Mustapha, Kamal Nasharuddin

doi:10.14525/jjce.8.1.2629

Cited by 14 publications

(7 citation statements)

References 30 publications

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“…Among these methods, the application of CFRP sheets has been proved as one of the most effective methods. CFRP material can be a perfect alternative to conventional materials for rehabilitating, strengthening and repairing of existing RC structures as well as in new constructions as alternative to steel reinforcement Soudki, El-Salakawy et al (2007), Zaman, Gutub et al (2013), Zhong, Wang et al (2013), Kalavagunta, Naganathan et al (2014), Danraka, Mahmod et al (2017), Dushimimana, Ziada et al (2018) Due to the widespread employment of CFRP in strengthening applications, many theoretical and experimental studies have focused on studying the behaviour of externally strengthened RC beams. Most of these studies have reported that the well bonded CFRP has improved the flexural strength of the structural elements and enhanced their stiffness and durability Kachlakev and McCurry (2000), Toutanji, Zhao et al (2006), Li, Xie et al (2009), Lavorato, Bergami et al (2018).…”

Section: Introductionmentioning

confidence: 99%

Flexural Strengthening of Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets with Grooves

Mashrei

Makki

Sultan

2019

Lat. Am. j. solids struct.

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The most common method used to strengthening, rehabilitation or repairing of reinforced concrete (RC) members is to use external carbon fiber reinforced polymer (CFRP) sheets. CFRP can greatly improve the flexural and shear capacity of deteriorated members and therefore extends their useful life. The main problem of external CFRP is the debonding of the sheets from the concrete surface at some point of loading, which negatively affects the efficiency of strengthening and may consequently lead to an unanticipated failure of the strengthened members. The major reason for this early debonding is likely due to the low accuracy of the preparation and the high stress concentration at the flat contact area exists between CFRP sheets and the concrete. The problem has been extensively discussed in the literature and some CFRP application techniques such as "Externally Bonded Reinforcement on Grooves (EBROG)" and "Externally Bonded Reinforcement in Grooves (EBRIG)" have been proposed as alternatives to the conventional application methods. Although some research has been carried out, there have been few experimental investigations that provided quantitative discussion of the efficiency of the new developed techniques. This research was aimed to experimentally assess the efficiency of grooving techniques and to provide a quantitative data regarding the behaviour of bonding between CFRP and concrete. The effects of shape and direction of the grooves and CFRP layers on the load carrying capacity, mid-span deflection and failure mode of thirteen RC beams have been investigated and discussed. In general, CFRP has significantly improved the flexural capacity of strengthened beams especially when grooving technique has been employed.

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Section: Introductionmentioning

confidence: 99%

Flexural Strengthening of Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets with Grooves

Mashrei

Makki

Sultan

2019

Lat. Am. j. solids struct.

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“…Carbon Fiber-Reinforced Polymer (CFRP) with great material performance has been widely applied in various aspects after its invention, and its mechanical properties have also been extensively studied (Kalavagunta et al, 2014;Barile et al, 2019;Zhang et al, 2019;Yang et al, 2019;Yuan et al, 2019;Saleem et al, 2019). As an effective alternative to traditional materials for strengthening and repairing damaged structures, CFRP-reinforced bridge structure has been extensively investigated (Lu et al, 2018;Peng et al, 2014;Hosseini et al, 2019;Shukri et al, 2018;Mashrei et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance and life prediction of CFRP plate in the RC bridge roof reinforcement

Yuan

Zheng²,

Zhu

et al. 2020

Lat. Am. j. solids struct.

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This paper investigated the fatigue properties and theoretical research on Carbon-Fiber-Reinforced Polymer (CFRP) RC bridge roof with new deck-pavement material. Two deck pavement schemes of CFRP-reinforced specimens were designed and tested. Four-point flexural fatigue tests were carried out on the specimens. The fatigue crack propagation, the deflection development and the CFRP strain under bridge fatigue load were researched. The test results show that the CFRP plate-reinforced specimens crack resistance performance can be improved and can bear the fatigue test load of two million times. Combined with the characteristics of the crack growth rate and fatigue damage accumulation of CFRP plate-reinforced bridge roof specimens, the fatigue life prediction analytical model for CFRP plate reinforced RC bridge roof was obtained. The fatigue life prediction model agrees well with the experimental results. The model proposed in this paper could be applied to predict the fatigue life of the CFRP plate-reinforced RC bridge roofs.

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“…This because high interfacial shear stresses and peeling stresses localize in the vicinity of the plate end. Plate end debonding can be delayed by increasing the bonded length (Schnerch et al 2007;Tavakkolizadeh and Saadatmanesh 2003;Photiou et al 2006a, b;Michael et al 2005;Gu et al 2012;Jesus et al 2012;Buyukozturk and Hearing 1999;Shaat andFam 2006, 2009;Teng et al 2012;Salama and Abd-El-Meguid 2010;Yu et al 2011;Hmidan et al 2013;Ochi et al 2011;Kalavagunta et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Structural performance of notch damaged steel beams repaired with composite materials

Eltaly

2016

Int J Adv Struct Eng

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An experimental program and an analytical model using ANSYS program were employed to estimate the structural performance of repaired damaged steel beams using fiber reinforced polymer (FRP) composite materials. The beams were artificially notched in the tension flanges at mid-spans and retrofitted by FRP flexible sheets on the tension flanges and the sheets were extended to cover parts of the beams webs with different heights. Eleven box steel beams, including one intact beam, one notch damaged beam and nine notches damaged beam and retrofitted with composite materials, were tested in twopoint loading up to failure. The parameters considered were the FRP type (GFRP and CFRP) and number of layers. The results indicated that bonding CFRP sheets to both of the tension steel flange and part of the webs, instead of the tension flange only, enhances the ultimate load of the retrofitted beams, avoids the occurrence of the debonding and increases the beam ductility. Also the numerical models give acceptable results in comparison with the experimental results.

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Axially Loaded Steel Columns Strengthened with CFRP

Cited by 14 publications

References 30 publications

Flexural Strengthening of Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets with Grooves

Flexural Strengthening of Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets with Grooves

Fatigue performance and life prediction of CFRP plate in the RC bridge roof reinforcement

Structural performance of notch damaged steel beams repaired with composite materials

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