URM Walls Strengthened with Fabric-Reinforced Cementitious Matrix Composite Subjected to Diagonal Compression

Babaeidarabad, Saman; Caso, Francisco De; Nanni, Antonio

doi:10.1061/(asce)cc.1943-5614.0000441

Cited by 124 publications

(65 citation statements)

References 13 publications

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“…The shear modulus, G, was calculated as G= cr / cr , where cr is the diagonal cracking strength and cr is the corresponding shear strain. The diagonal cracking strength was defined as cr = max , for the control (unretrofitted) specimens and as cr =0.7 max , for the retrofitted ones, consistent with a number of studies, including the recent ones of Dizhur et al (2013), Parisi et al (2013) and Babaeidarabad et al (2014).…”

Section: Diagonal Compression Tests On Masonry Wallettesmentioning

confidence: 99%

“…The use of textile-reinforced mortar (TRM) as strengthening material for substandard reinforced concrete (RC) members , Bournas et al 2007, Bournas et al 2009, Al-Salloum et al 2011) and for masonry panels , Papanicolaou et al 2008, Harajli et al 2010, Parisi et al 2013, Babaeidarabad et al 2014) has been experimentally investigated in the past and has been reported to be effective in the majority of the cases. In the recent past the authors presented a concept for strengthening masonry-infilled RC frames with TRM.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

2015

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Abstract:The present paper proposes an analytical approach for modeling the behavior of textilereinforced mortar (TRM)-strengthened masonry-infilled reinforced concrete (RC) frames under seismic loading. The model falls into the discrete diagonal-element type and is based on the use of single-strut and single-tie elements to represent the infill panel. It builds on the results of past experimental studies by the authors in which the application of TRM jacketing was proved to be effective for the seismic retrofitting of masonry infilled RC frames. The model is implemented in the non-linear finite element code Opensees, with the parameters of the diagonal elements being determined from a series of tests on TRM coupons and masonry specimens. Finally, the results of the numerical analyses are compared with the experimental data of cyclic tests on three-story masonry infilled RC frames, as-build and after retrofitting.It is shown that the model developed herein adequately accounts for the TRM-strengthening contribution to the global response of masonry infilled frames.

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Section: Diagonal Compression Tests On Masonry Wallettesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

2015

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“…cement-based mortars) for strengthening reinforced concrete structures has been reported less than a decade ago by , and Bournas et al (2007); and more recently by D'Ambrisi and Focacci (2011), Al-Salloum et al (2011, 2012 and Loreto et al (2014). Tests on masonry sub-assemblies and wallettes have provided experimental evidence that TRM is effective in strengthening masonry structures too, as it enhances both the in-plane and out-of-plane strength , Papanicolaou et al 2008, Harajli et al 2010, Augenti et al 2011, Papanicolaou et al 2011, Babaeidarabad et al 2013, as well as the strength in diagonal compression (Prota et al 2006, Babaeidarabad et al 2014. Nonetheless, in all these studies individual, single storey wall-type masonry specimens were employed, without considering the frame-wall interaction in multistorey structures.…”

Section: Introductionmentioning

confidence: 99%

Seismic Strengthening of Masonry-Infilled RC Frames with TRM: Experimental Study

2015

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Abstract:The paper presents a technique for retrofitting non-seismically reinforced concrete (RC) masonry-infilled frames with textile-reinforced mortar (TRM) jacketing. In the present study the application of TRM is examined on nearly full-scale, as-built and retrofitted, three-storey frames, subjected to in-plane cyclic loading. The results of testing a 2:3 scale, as-built frame representing typical structures with non-seismic design and detailing characteristics and of a companion frame retrofitted via TRM jacketing are presented and compared in terms of the efficiency of the proposed technique to enhance the strength and deformation characteristics of sub-standard infilled frames.

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“…The use of FRP (Fiber Reinforced Polymers) materials are particularly suited to strengthening pre-existing masonry constructions and can be used to extend the fatigue life or provide an increase in strength of a structure [1][2][3][4].…”

Section: Introduction and Research Significancementioning

confidence: 99%

Properties of Aged GFRP Reinforcement Grids Related to Fatigue Life and Alkaline Environment

et al. 2017

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Abstract:In recent years, even if Fiber Reinforced Polymer (FRP) composites have been widely used for strengthening of civil buildings, a new generation of materials has been studied and proposed for historical masonry construction. These buildings, mainly made of stone work, are common in many areas of Europe and Asia and recent earthquakes has been the cause of many catastrophic failures. The brittleness of unreinforced historic masonry can be considerably reduced using new retrofitting lighter-weight materials such FRP, even if limitations were evidenced due to material and mechanical compatibility with poor substrates. Thus, fibrous reinforcements were used as long fibres incorporated into a cement or lime matrix, which better match with the properties of ancient masonry. The use of low strength fibers such as glass and basalt, respect to carbon, in presence of an alkaline matrix brought out durability issues, due to the chemical vulnerability of common glass and basalt fibres. The objective of this research is to explore the effects of selected aqueous environments and fatigue loading on the mechanical and physical properties of composite grids, made of E-CR (Electrical/Chemical Resistance) glass fibers and epoxy-vinylester resin, used as tensile reinforcement in new composite reinforced mortar systems. Glass-fiber-reinforced polymer (GFRP) coupons were subjected to tensile testing and a severe protocol of durability tests, including alkaline environment and fatigue tensile loads. Accelerated ageing tests were used to simulate long-term degradation in terms of chemical attack and consequent reduction of tensile strength. The ageing protocol consisted of immersion at 40 • C in alkaline bath made by deionized water and Ca(OH) 2 , 0.16% in weight, solution for 30 days. GFRP specimens aged and unaged were also tested under tensile fatigue cycles up to 1,000,000 cycles and a nominal frequency of 7.5 Hz. After this severe conditioning the tests indicate a good tensile strength retention of the GFRP in absence of fatigue loads, while a significant loss in fatigue life was experienced when both alkaline exposure and fatigue loads were applied.

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URM Walls Strengthened with Fabric-Reinforced Cementitious Matrix Composite Subjected to Diagonal Compression

Cited by 124 publications

References 13 publications

Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

Seismic Strengthening of Masonry-Infilled RC Frames with TRM: Experimental Study

Properties of Aged GFRP Reinforcement Grids Related to Fatigue Life and Alkaline Environment

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