In-plane shear capacity of tuff masonry walls with traditional and innovative Composite Reinforced Mortars (CRM)

Zoppo, Marta Del; Ludovico, Marco Di; Balsamo, Alberto; Prota, Andrea

doi:10.1016/j.conbuildmat.2019.03.133

Cited by 44 publications

(29 citation statements)

References 17 publications

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“…monitor the in-plane displacements along principal directions over a gauge length of 400 mm. More details about the test set-up and the instrumentation can be found in Del Zoppo et al [4].…”

Section: Setup and Instrumentationmentioning

confidence: 99%

“…Recently, the use of inorganic composites has been largely investigated for improving the in-plane shear capacity of masonry panels, due to their higher compatibility with the masonry substrate and their suitability with a life-cycle design of retrofit interventions. Among the inorganic composite materials, three main classes can be identified: Fibre/Fabric Reinforced Cementitious Mortar (FRCM, also known as Textile Reinforced Mortar or TRM), Composite Reinforced Mortar (CRM) [4], and Fibre Reinforced Mortar (FRM) [5]. FRCM and CRM systems both consist in an FRP grid (or mesh reinforcement) embedded in the inorganic matrix.…”

Section: Introductionmentioning

confidence: 99%

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Diagonal compression testing of masonry panels with irregular texture strengthened with inorganic composites

et al. 2020

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Inorganic composites for enhancing the in-plane shear capacity of masonry walls with irregular texture were investigated on twenty-one panels under diagonal compression tests. Three specimens were used as control and twelve specimens were strengthened with two Fibre Reinforced Mortars (FRM-A and FRM-B), characterized by a different content of fibres embedded in the lime-based matrix. The remaining six specimens were strengthened with Fabric Reinforced Cementitious Mortars (FRCM), consisting in a GFRP grid embedded in a fibre reinforced matrix (the same used for FRM-A). The influence of single-side and double-side strengthening configurations on the capacity of strengthened panels was also investigated, to point out the reduction in strengthening effectiveness in case of single-sided applications. The results showed that all the inorganic composites adopted for the strengthening techniques provided a substantial increase of shear capacity. The grid in FRCM strengthened panels played an important role in both strength and deformation capacity at peak. The different fibres content (lower than 50% in weight) in FRM systems slightly affected the overall performance of panels. Finally, analytical predictions of experimental results were reported and discussed and a preliminary analytical model for estimating the FRM shear contribution was proposed, obtaining a good agreement with test results.

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Section: Setup and Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diagonal compression testing of masonry panels with irregular texture strengthened with inorganic composites

et al. 2020

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“…Depending on the fiber and matrix type employed, inorganic-matrix composites can be referred to as fiber-reinforced cementitious matrix (FRCM) or textile-reinforced mortar (TRM), where open-mesh textiles and cement- or lime-based mortars are employed [ 4 , 5 ] (in this paper, the acronym FRCM is adopted), textile-reinforced concrete (TRC), where high strength finely grained concrete embeds open-mesh textiles [ 6 , 7 ], or steel-reinforced grout (SRG), which are comprised of unidirectional steel cords and inorganic matrices [ 8 , 9 ]. Recently, systems made of composite grids embedded within inorganic matrices, which are referred to as composite-reinforced mortar (CRM), have been increasingly adopted as externally bonded reinforcement of masonry members [ 10 ]. CRM systems are particularly attractive because of their simplicity of installation and low price [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Wet-Dry Cycles on the Bond Behavior of Fiber-Reinforced Inorganic-Matrix Systems Bonded to Masonry Substrates

et al. 2021

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In recent years, inorganic-matrix reinforcement systems, such as fiber-reinforced cementitious matrix (FRCM), composite-reinforced mortars (CRM), and steel-reinforced grout (SRG), have been increasingly used to retrofit and strengthen existing masonry and concrete structures. Despite their good short-term properties, limited information is available on their long-term behavior. In this paper, the long-term bond behavior of some FRCM, CRM, and SRG systems bonded to masonry substrates is investigated. Namely, the results of single-lap direct shear tests of FRCM-, CRM-, and SRG-masonry joints subjected to wet-dry cycles are provided and discussed. First, FRCM composites comprising carbon, polyparaphenylene benzobisoxazole (PBO), and alkali-resistant (AR) glass textiles embedded within cement-based matrices, are considered. Then, CRM and SRG systems made of an AR glass composite grid embedded with natural hydraulic lime (NHL) and of unidirectional steel cords embedded within the same lime matrix, respectively, are studied. For each type of composite, six specimens are exposed to 50 wet–dry cycles prior to testing. The results are compared with those of nominally equal unconditioned specimens previously tested by the authors. This comparison shows a shifting of the failure mode for some composites from debonding at the matrix–fiber interface to debonding at the matrix-substrate interface. Furthermore, the average peak stress of all systems decreases except for the carbon FRCM and the CRM, for which it remains unaltered or increases.

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“…The mechanical properties of the substrates where TRM strengthening materials are applied, play a crucial role, since cement-based composites are often employed to reinforce weak masonries [7]. Various studies have been conducted to identify TRM's mechanical properties [8][9].…”

Section: Introductionmentioning

confidence: 99%

TRM-Strengthened Timbrel Cross Vaults Subjected to Vertical Settlements

Calderón¹,

Bertolesi²,

Buitrago³

et al. 2021

12th International Conference on Structural Analysis of Historical Constructions

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Two full-scale timbrel cross vaults subjected to vertical settlements in one of their supports were tested at the ICITECH laboratories of the Universitat Politècnica de València. In one of the vaults a support was moved downwards, while the other was subjected to upward-downward displacements in one support. Both tests are described and analysed in detail in Torres et al. [1,2]. Both vaults presented certain levels of post-test damage in the form of cracks and significant displacements. In order to analyse the effectiveness of the reinforcement of previously damaged vaults, both were strengthened with TRM and subjected to further testing in which vertical settlements were applied to one support. The TRM strengthening comprised an extrados layer composed of a 25x25 mm glass grid embedded into two approximately 5 mm thick layers of cementitious matrix. The TRM strengthening was able to withstand higher peak loads and prevent the formation of cracks along the extrados surface of the structure, while as expected, ductility increased. A 3D macro-modelling FE strategy on Abaqus commercial software was also adopted to study the behaviour of the vaults during the tests.

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In-plane shear capacity of tuff masonry walls with traditional and innovative Composite Reinforced Mortars (CRM)

Cited by 44 publications

References 17 publications

Diagonal compression testing of masonry panels with irregular texture strengthened with inorganic composites

Diagonal compression testing of masonry panels with irregular texture strengthened with inorganic composites

Effect of Wet-Dry Cycles on the Bond Behavior of Fiber-Reinforced Inorganic-Matrix Systems Bonded to Masonry Substrates

TRM-Strengthened Timbrel Cross Vaults Subjected to Vertical Settlements

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