Use of DIC and AE for Monitoring Effective Strain and Debonding in FRP and FRCM-Retrofitted RC Beams

Pohoryles, Daniel A.; Melo, José; Rossetto, Tiziana; Fabian, Matthias; McCague, C; Stavrianaki, K.; Lishman, Ben; Sargeant, Ben

doi:10.1061/(asce)cc.1943-5614.0000715

Cited by 35 publications

(17 citation statements)

References 37 publications

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“…11. These curves are representative of experimental evaluations of cohesive shear acting at the concrete-GFRP interface in a form coherent with a Cohesive Zone (CZM) approach and with recent literature results [21][22][23][24][25][26][27][28][29][30][31][32]. The value of the observed debonding force falls within the range of experimental outcomes obtained by the authors through a previous testing system on similar specimens made of the same GFRP lamina and epoxy resin [18].…”

Section: Resultssupporting

confidence: 83%

“…Several researchers are being studied this local failure mechanism by proposing different test setups, generally based on either linear variable displacement transducers (LVDTs) or laser meter devices installed on composite plate and located at the beginning of bonded area, as well as on strain gauges, positioned along longitudinal direction [21][22][23]. Some recent studies have introduced a non-contact optical technique, digital image correlation (DIC), to obtain the FRPconcrete slip on extended areas of tested specimen rather than only on the beginning of bonded area [24][25][26][27][28][29][30][31][32]. This promising method also allows for an estimation, with a good accuracy, of the strain field on FRP and concrete core external surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Cohesive fracture in composite systems: experimental setup and first results

Berardi¹,

Perrella²,

Cricrı̀³

2019

Frattura Ed Integrità Strutturale

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Composite systems are widely used in many engineering applications for new structures and strengthening of existing ones. Within the structural rehabilitation of civil constructions, the plating technique of beams with Fiber Reinforced Polymer (FRP) represents a quick and optimal intervention with respect to traditional ones. The failure of these composite systems usually occurs due to the FRP debonding, which corresponds to a mode II fracture of concrete specimens. In this paper, a new experimental setup for investigating the mode II fracture behavior of FRP-concrete composite structures is presented. The test equipment consists of both conventional equipment and a non-contact optical technique, Digital Image Correlation (DIC), and the test system was realized at the Design Machine Laboratory of the University of Salerno. A preliminary test was performed and the corresponding results are shown and discussed.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Cohesive fracture in composite systems: experimental setup and first results

Berardi¹,

Perrella²,

Cricrı̀³

2019

Frattura Ed Integrità Strutturale

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“…In this study, the effect of using steel or basalt fibers on the overall shear response and its impact on the ultimate failure mode were examined using the DIC technique. The Digital Image Correlation (DIC) technique is spreading great interest in the research community because of its low costs, effectiveness, and capacity to monitor displacements and strains during experimental tests [ 26 , 27 ]. Hence, the scope of this study is to understand the following: The effect of different fiber materials (steel or basalt fiber) on shear cracking behavior.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Steel and Basalt Fibers on the Shear Behavior of Double-Span Fiber Reinforced Concrete Beams

Krassowska

Kosior‐Kazberuk

2021

Materials

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This study investigates the effects of adding different types of fibers to concrete mixes on the shear behavior of double-span fiber-reinforced concrete beams with or without shear reinforcement. As a part of the experimental study, a total of twenty-seven natural-scale double-span beams were tested. The beams, made of concrete with steel or basalt fiber, with fiber dosages of 78.5 and 5 kg/m3, were tested under shear force. The three tested series consisted of three beams with dimensions of 120 × 300 × 4150 mm, with various numbers of stirrups and contents of fiber reinforcement. During the tests, the shear capacity of the elements was determined. The values of support reactions, deflection in the middle of the span of both beam spans, deformations on the surface of the concrete member in the middle of the span in the compressive and tensile zone, and cracking (crack development and crack width) were also measured. The beams were tested using a digital image correlation (DIC) technique. Test results show that shear capacity increases in beams made of concrete with steel (1.87) or basalt fibers (1.23). Moreover, the failure mode changes from shear (brittle) to flexure-shear (less brittle). The experimental shear capacity of beams was compared with the theoretical values predicted by different design codes, i.e., fib Model Code 2010 and RILEM TC 162-TDF 2003. The results show that all the design codes underestimate the contribution of fiber-reinforced concrete beams to shear resistance and greatly overestimate the contribution of shear reinforcement.

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“…Pohoryles et al [20] presented a comparative analysis of instrumentation for monitoring beams retrofitted with FRP and FRCM systems. They demonstrated DIC measurements' accuracy by comparing the strains and the displacements with what was found by traditional measurements methods such as strain gauges and LVDTs.…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of the DIC as a Measurement System in SRG Shear Strengthened Reinforced Concrete Beams

Funari

Verre

2021

Crystals

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Steel Reinforced Grout (SRG) materials are generating considerable interest as strengthening system of reinforced concrete (RC) structures. They are finding increasing use in several civil engineering applications mainly due to the advantages they offer over traditional material such as high strength to weight ratio, ease of application, durability and low price. This paper describes the results of an experimental investigation carried out on SRG shear strengthened RC beams and gives evidence of the Digital Image Correlation (DIC) effectiveness as a measurement system. The tests performed had two main objectives: (i) assess the effectiveness of continuous and discontinuous U-wrapped jackets comprising a different number of layers and strips; (ii) assess the shear crack distribution during the tests by means of the DIC measurements. The results confirmed that reinforcing RC beams with SRG jackets can increase the load-bearing capacity; when the beam was reinforced with a continuous two-layered SRG strip, an increase of 84% was observed (compared to the unreinforced beam). The Linear Variable Differential Transformers (LVDT) measurements validated the results obtained by means of the DIC.

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Use of DIC and AE for Monitoring Effective Strain and Debonding in FRP and FRCM-Retrofitted RC Beams

Cited by 35 publications

References 37 publications

Cohesive fracture in composite systems: experimental setup and first results

Cohesive fracture in composite systems: experimental setup and first results

The Effect of Steel and Basalt Fibers on the Shear Behavior of Double-Span Fiber Reinforced Concrete Beams

The Effectiveness of the DIC as a Measurement System in SRG Shear Strengthened Reinforced Concrete Beams

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