FRP-Masonry Debonding: Numerical and Experimental Study of the Role of Mortar Joints

Carloni, Christian; Subramaniam, Kolluru V. L.

doi:10.1061/(asce)cc.1943-5614.0000282

Cited by 85 publications

(89 citation statements)

References 22 publications

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“…(1) that governs the bond-slip and consequently the energy of fracture. It was noted that even a consistent changing of the law and considerably reducing of the fracture energy, the curve force-elongation does not vary significantly [48], it was decided to eliminate the mortar-fiber interface. To this purpose, the same interface law previously calibrated according to scenario 1 was also used here but it was only applied to bricks, irrespective of their positions (Fig.…”

Section: Resultsmentioning

confidence: 99%

Numerical and experimental study of GFRP-masonry interface behavior: Bond evolution and role of the mortar layers

Mazzotti¹,

Murgo²

2015

Composites Part B: Engineering

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Section: Resultsmentioning

confidence: 99%

Numerical and experimental study of GFRP-masonry interface behavior: Bond evolution and role of the mortar layers

Mazzotti¹,

Murgo²

2015

Composites Part B: Engineering

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“…In fact, experimental curves obtained from masonry prisms presented several discontinuities or jumps during the debonding part of the tests, with a typical saw-tooth shaped curve, where load drops are associated with the periodic alternation of bricks and mortar joints on the substrate [10,27,[44][45][46]. This particular behavior was mainly observed analyzing load-slip curves and confirmed by local strain gauges readings during tests execution; several numerical models [39,44,[47][48][49] were then developed in order to validate experimental outcomes and to better understand this phenomenon, assuming different interface laws for bricks and mortar joints.…”

Section: Global Results: Force-slip Curves 23mentioning

confidence: 75%

“…Tests are carried out mainly under displacement control. Displacement transducers (LVDTs or potentiometers) have been used for monitoring the slip between the reinforcement and the substrate during the test, whereas strain gauges or innovative techniques (such as Digital Image Correlation [28,33,37,39,41,42]) allowed to analyze local strain distributions during the debonding process. Results of bond tests have been analyzed and discussed in terms of load-slip curves, strain distributions, and, when possible, interface laws experimentally determined.…”

Section: Set-up 21mentioning

confidence: 99%

A review on the bond behavior of FRP composites applied on masonry substrates

Bellini

Mazzotti

2017

RILEM Tech Lett

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The need of repairing and retrofitting masonry buildings, typical of Italian and European built heritage, determined a growing interest towards the development of effective and cost efficient innovative strengthening solutions. Among the different techniques currently available, the adoption of composite materials, such as Fiber Reinforced Polymers (FRPs), proved to be one of the most viable solutions for the strengthening of masonry structures. If not properly fixed, a common failure mode of this system is the early debonding of the reinforcement from the substrate. For this reason, several experimental tests and numerical analyses are currently available in the literature, clarifying and predicting the bond behavior of FRP glued to masonry substrates. The purpose of this paper is to provide an overview of the results obtained by the different experimental works, of the numerical analyses performed both for evaluating and validating experimental results and of the simplified analytical models currently available for the prediction of the maximum capacity of the strengthening systems. Results of extended experimental campaigns, carried out also within different Round Robin Test (RRT) series, with several laboratories involved, and recent model calibrations will be discussed together with the approach proposed by the actual guidelines.

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“…14(a and b). It can be seen that the bonded area consists of three main regions as also discussed in [10,30]. The FRP is fully debonded from the substrate near the loaded end.…”

Section: Strain Analysis Resultsmentioning

confidence: 87%

“…Several researchers have focused during the last years on experimental, numerical and analytical modeling of the bond behavior in FRP-strengthened masonry, see e.g. [7][8][9][10][11][12][13][14][15][16]. The experimental tests have been conducted on different substrates (including stone, brick or masonry prism) strengthened with various FRP composites.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the bond performance in FRP–brick components re-bonded after initial delamination

Ghiassi

Xavier

Oliveira

et al. 2015

Composite Structures

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a b s t r a c tThe bond behavior between Fiber Reinforced Polymers (FRPs) and masonry substrates has been the subject of many studies during the last years. Recent accelerated aging tests have shown that bond degradation and FRP delamination are likely to occur in FRP-strengthened masonry components under hygrothermal conditions. While an investigation on the possible methods to improve the durability of these systems is necessary, the applicability of different bond repair methods should also be studied.This paper aims at investigating the debonding mechanisms after repairing delaminated FRPstrengthened masonry components. FRP-strengthened brick specimens, after being delaminated, are repaired with two different adhesives: a conventional epoxy resin and a highly flexible polymer. The latter is used as an innovative adhesive in structural applications. The bond behavior in the repaired specimens is investigated by performing single-lap shear bond tests. Digital image correlation (DIC) is used for deeper investigation of the surface deformation and strains development. The effectiveness of the repair methods is discussed and compared with the strengthened specimens.

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FRP-Masonry Debonding: Numerical and Experimental Study of the Role of Mortar Joints

Cited by 85 publications

References 22 publications

Numerical and experimental study of GFRP-masonry interface behavior: Bond evolution and role of the mortar layers

Numerical and experimental study of GFRP-masonry interface behavior: Bond evolution and role of the mortar layers

A review on the bond behavior of FRP composites applied on masonry substrates

Evaluation of the bond performance in FRP–brick components re-bonded after initial delamination

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