Application of digital image correlation in investigating the bond between FRP and masonry

Ghiassi, Bahman; Xavier, José; Oliveira, Daniel V.; Lourenço, Paulo B.

doi:10.1016/j.compstruct.2013.06.024

Cited by 117 publications

(78 citation statements)

References 15 publications

(31 reference statements)

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“…Figure 3c clearly shows the detachment of CFRP with thin layer of brick from masonry panel surface. Similar type of failure was witnesses by Bahman et al who performed single lap shear test to evaluate the deboning behavior of FRP from brick surface by using Digital Image Correlation (DIC) technique [32,33]. DIC technique is becoming popular among researchers for full-field measurement of strains and deformation by comparing the image features at different mechanical states.…”

Section: Failure Modesmentioning

confidence: 89%

Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

et al. 2015

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In the current research work, an attempt is made to increase the seismic capacity of unreinforced masonry (URM) structures by proposing a new composite material which can improve shear strength and deformation capacity of URM wall systems. Fiber Reinforced Polymer (FRP) having high tensile and shear stiffness can significantly increase in-plane and out-of-plane strength of masonry walls, but, inherently, FRP strengthened wall systems exhibit brittle failure under extreme seismic loading. Polypropylene (PP-band) is a low cost material with sufficient ductility and deformation capacity. Keeping in view the behavior of FRP and PP-band, a composite of FRP and PP-band is proposed for retrofitting of URM walls. Mechanical behavior of the proposed composite material is assessed by carrying out an in-plane diagonal compression test and an out-of-plane bending test on twenty-five 1/4-scaled masonry wall panels. Experimental plan for each panel, URM, PP-band retrofitted, FRP retrofitted and FRP + PP-band retrofitted masonry, is diagonal compression test and three-point bending test. Experimental results have determined that FRP + PP-band composite increased, not only the initial peak strength, but also the ductility, deformation capacity and residual strength of URM wall systems. OPEN ACCESSPolymers 2015, 7 964

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Section: Failure Modesmentioning

confidence: 89%

Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

et al. 2015

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“…Damage initiation and interfacial microcracking cannot be exactly detected, while FRP debonded areas can be monitored and located during the tests from the obtained strain distribution. In SRG-strengthened specimens, the crack evolution on the mortar surface can be precisely followed during the debonding tests [15]. For on-site application, this technique could be used for short-or medium-term investigations when the FRP surface is visible and accessible and the speckle patter is protected from degradation.…”

Section: Location Of Debondingmentioning

confidence: 99%

“…DIC has been used during shear bond tests on GFRP-and SRG-strengthened bricks to obtain the evolution of strains on the FRP surface [15]. The use of active IR thermography for detection of interfacial flaws and FRP delamination induced by environmental ageing, with specimens similar to the ones used in this study, is reported in [16].…”

Section: Ndt For Debonding Detectionmentioning

confidence: 99%

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Debonding damage analysis in composite-masonry strengthening systems with polymer- and mortar-based matrix by means of the acoustic emission technique

Verstrynge

Wevers

Ghiassi

et al. 2015

Smart Mater. Struct.

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This is the postprint of a paper published as: Verstrynge, E., Wevers, M., Ghiassi, B., Lourenço, P. (2016 ABSTRACT: Different types of strengthening systems, based on fiber reinforced materials, are under investigation for external strengthening of historic masonry structures. A full characterization of the bond behavior and of the short-and long-term failure mechanisms is crucial to ensure effective design, compatibility with the historic substrate and durability of the strengthening solution. Therein, nondestructive techniques are essential for bond characterization, durability assessment and on-site condition monitoring. In this paper, the Acoustic Emission (AE) technique is evaluated for debonding characterization and localization on Fiber Reinforced Polymer (FRP)-and Steel Reinforced Grout (SRG)-strengthened clay bricks. Both types of strengthening systems are subjected to accelerated ageing tests under thermal cycles and to single-lap shear bond tests. During the reported experimental campaign, AE data from the accelerated ageing tests demonstrated the thermal incompatibility between brick and epoxy-bonded FRP composites and debonding damage was successfully detected, characterized and located. In addition, a qualitative comparison is made with digital image correlation and infrared thermography, in view of efficient on-site debonding detection.

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“…The deformation of the facet after several steps in testing is shown with respect to the reference image. Typically increasing the facet size enhances the accuracy of the measurements but will lower the spatial resolution which is defined by the facet size [38]. In this study, the specimens were prepared by applying a speckle pattern as shown in Fig.3.…”

Section: Digital Image Correlation Measurement Techniquementioning

confidence: 99%

Cracking behavior and crack width predictions of FRP strengthened RC members under tension

Zomorodian

Yang

Belarbi

et al. 2016

Engineering Structures

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link CRACKING BEHAVIOR AND CRACK WIDTH PREDICTIONS OF FRP STRENGTHENED RC MEMBERS UNDER TENSION AbstractThis paper presents and discusses the experimental results of uniaxial tensile tests of fiber reinforced polymer externally strengthened reinforced concrete (FRP strengthened RC) prisms in terms of crack width and crack spacing. As a non-contact and material independent system for in-time measurement of displacement and strain, the digital image correlation (DIC) technique has been used in this study for investigating the evolution of strains and formation of cracks during uniaxial tensile tests. As a result, the cracks were measured precisely at any load stage.The experimental results of tests performed by authors and other researchers on FRP strengthened RC members in tension are compared to prediction models from code provisions and guidelines (Eurocode 2 and fib 14), and their suitability are analyzed and discussed. The results show the dependence of the behavior and crack characteristics of FRP strengthened RC members to parameters such as wrapping scheme and FRP reinforcement ratios which are not included in design provisions for crack analysis. A new formulation for crack width and spacing for FRP strengthened RC members, calibrated using the experimental results, has been proposed which considers all the main affecting parameters.

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Application of digital image correlation in investigating the bond between FRP and masonry

Cited by 117 publications

References 15 publications

Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

Debonding damage analysis in composite-masonry strengthening systems with polymer- and mortar-based matrix by means of the acoustic emission technique

Cracking behavior and crack width predictions of FRP strengthened RC members under tension

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