Flexural behavior of reinforced concrete beams strengthened with a hybrid inorganic matrix - steel fiber retrofit system

Papakonstantinou, Christos G.; Katakalos, Konstantinos

doi:10.12989/sem.2009.31.5.567

Cited by 28 publications

(20 citation statements)

References 13 publications

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“…4. However, the result obtained by Papakonstantinou and Katakalos [21], is different on the majority of the CFRG-strengthened beams studies on ductility whereby using 3 mm thick steel cord-based CFRG composites is 9% higher than the non-strengthened RC beam. Although CFRG strengthening system commonly does not enhance the ductility, it can improve the stiffness of the repaired RC beam.…”

Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 73%

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Guades¹,

Stang²

2019

WIT Transactions on the Built Environment

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Rehabilitation of historic buildings is a priority since their structural elements suffered from various levels of damage that took place during their service life. Recently, geopolymer is gaining acceptance as an emerging material in the construction industry due to its added advantages. It has shown excellent bond strength to concrete substrate, lower creep and shrinkage, greater durability in severe environments and higher temperature and fire resistance. Geopolymer is relatively new in the rehabilitation system of building structures, although it had been used for new construction applications. Therefore, an effort was made to gather information on the use of geopolymer as repair and strengthening material. This paper reviewed the structural performance of geopolymer-strengthened concrete elements and the field applications of geopolymer as strengthening material for historical buildings. Information from the literature revealed that the load capacity of the non-damaged and fully damaged reinforced concrete (RC) beam can be increased by 12% and 100%, respectively, when strengthened using plain geopolymer. It was found that short fiber-reinforced geopolymer (SFRG) strengthening system enhanced the peak load of RC beam by 15% while 370% if using continuous fiber-reinforced geopolymer (CFRG). To date, field applications of geopolymer strengthening system on historical buildings were limited, nevertheless this technique provided good structural performance making it suitable in the rehabilitation process.

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Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 73%

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Guades¹,

Stang²

2019

WIT Transactions on the Built Environment

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“…Finally, unidirectional tension tests were conducted on resin rich SFRP sheets up to failure to obtain the Young's modulus (E 1 ) and strength (fu 1 ) in their fibre orientation and the Poisson's ratio (ν 12 = (E1/E2)ν 21 ). The remaining two material properties pertaining to the orthotropic nature of the material under the plane stress assumption, namely the transverse Young's modulus E 2 and the shear modulus G 12 , were derived by applying the conventional rule of mixture for composites [17], taking into account the manufacturer's specifications for the resin and the FRP sheets (see acknowledgements) and the experimentally determined volume fraction of resin and FRP sheets.…”

Section: Materials Testsmentioning

confidence: 99%

Experimental Investigation and Numerical Simulation of Shear Behaviour of Rc T-Beam Specimens With or Without SFRP-Strips Under Cyclic Loading

Manos¹,

Katakalos²,

Theofanous³

2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Successful FRP anchoring results in the development of high levels of tensile forces at the FRP layers, thus meeting the strengthening design requirements for the structural members under consideration [1]. The shear capacity of reinforced concrete (R/ C) structural elements, with lo w ratio value of the steel t ransverse reinforcement (stirrups), can be enhanced by applying such FRP strips as transverse external reinforcement [1], [8]. This paper presents results from an experimental investigation aiming to develop such a shear strengthening technique based on anchored open hoop CFRP or SFRP strips in the form of external transverse reinforcement ( Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Shear Strengthening of R/C Beams with FRP Strips and Novel Anchoring

Manos¹,

Katakalos²,

Koidis³

et al. 2012

JCE

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The shear strengthening behaviour of R/ C beams, when applying FRP strips externally with or without anchoring, is studied. This is done by subjecting six specimens of prototype dimensions with or without such strengthening to four-point bending. Specimens strengthened with either carbon or steel FRP strips without the use of anchors exhibited a modest increase in shear capacity, when co mpared to the non-strengthened control specimen, due to the debonding mode of failure of these FRP strips. The patented anchoring device was utilized together with either carbon or steel FRP strips for shear strengthening. In this case, the FRP strips debonding failure was prevented and the increase of the shear capacity was much larger than in identical specimens without anchors. An expert system developed for this purpose is quite efficient in producing successful shear capacity predictions based on the provisions of various codes. The Greek Code for ret rofitting existing R/ C structures yields shear capacity predictions in good agreement with measured values.

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Flexural behavior of reinforced concrete beams strengthened with a hybrid inorganic matrix - steel fiber retrofit system

Cited by 28 publications

References 13 publications

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Experimental Investigation and Numerical Simulation of Shear Behaviour of Rc T-Beam Specimens With or Without SFRP-Strips Under Cyclic Loading

Shear Strengthening of R/C Beams with FRP Strips and Novel Anchoring

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