Experimental and analytical study of reinforced concrete beams shear strengthened with different types of textile-reinforced mortar

Escrig, Christian; Gil, Lluı́s; Puigvert, Francesc

doi:10.1016/j.conbuildmat.2015.03.013

Cited by 125 publications

(47 citation statements)

References 21 publications

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“…As the figure shows, the stiffness of the strengthened LO panels 442 is restored to that of the SW panel, and the stiffness of the SO panels is higher than that of the SW 443 panel. These results concur with those of studies, where masonry panels that were strengthened 444 with FRCM on only the tension side and tested in one-way action exhibited higher stiffness than 445 the non-strengthened panels (Escrig et al 2015). Therefore, the stiffness increase can be attributed 446 primarily to the FRCM layer applied on the tension side, although, the reduction of the eccentricity 447 relative to the panel thickness might also play a significant role in this case.…”

Section: Control Specimen -Solid Wallsupporting

confidence: 83%

Axially Loaded RC Walls with Cutout Openings Strengthened with FRCM Composites

et al. 2018

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15Upgrading existing buildings to new functional requirements may require new openings that 16 can weaken the structure and prompting the need for strengthening. In such cases traditional 17 strengthening solutions such as creating a reinforced concrete (RC) or steel frame around the 18 opening, imply long term restrictions in the use of the structure compared to solutions that use 19 externally bonded composites. Two fabric-reinforced cementitious matrix composites (FRCM) 20 composites were used in this study to restore the capacity of panels with newly created door type 21 openings to that of a solid panel. Five, half scale RC panels acting as two-way action compression 22 members were tested to failure. Two, full-field optical deformation measurement systems were 23 used to monitor and analyze the global structural response of each tested panel (i.e. crack pattern, 24 failure mechanism, and displacement/strain fields). The performance of existing design methods 25 for RC panels has been assessed in comparison with the experimental results. The capacity of 26 strengthened panels with small openings (450 mm x 1050 mm) was entirely restored to that of the 27 solid panel. However, for panels with large openings (900 mm x 1050 mm), only 75% of the solid 28 panel's capacity was restored. The capacity of the strengthened panels was about 175% and 150% 29 higher compared to that of reference panels with small and large openings, respectively. 30 contribute to the building's structural mass. The use of externally bonded composites can 48 overcome the mentioned drawbacks. Due to their relative light weigh, their contribution to the 49 structural mass is greatly reduced compared to traditional methods and do not require additional 50 foundations. Recently, two epoxy-bonded fiber reinforced polymer (FRP)-based strengthening 51 solutions for RC walls with openings subjected to axial loads have been investigated by 52 Mohammed et al. (2013) for one way action (OW) panels and by Popescu et al. (2017a) for two 53 Page 4 of 35 way action (TW) panels. The terms OW action and TW action refer to the boundary conditions of 54 the elements, which are restrained only on the top and bottom edges and restrained on three or four 55 edges, respectively. 56

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Section: Control Specimen -Solid Wallsupporting

confidence: 83%

Axially Loaded RC Walls with Cutout Openings Strengthened with FRCM Composites

et al. 2018

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“…Leading research efforts were also done, for instance, in the US (Mobasher [4]), Israel (Peled and Bentur [5], Peled et al [6]), Brazil (Fidelis et al [7], de Andrade Silva et al [8]), Greece (Papanicolaou et al [9], Triantafillou and Papanicolaou [10], Triantafillou et al [11]), and Denmark (Blanksvärd and Täljsten [12]). Further on, researchers in Italy (Colombo et al [13] and Colombo et al [14]), Spain (Escrig et al [15]), Belgium (Cauberg et al [16] and Tysmans et al [17]), France (Contamine et al [18]), UK (Tetta et al [19]), Sweden (Williams Portal et al [20,21]), Iran (Kamani et al [22]), and other countries of the world work meanwhile on the topic of TRC. To sum up all these results, a RILEM task group TC 232-TDT was founded in 2009 to report the most promising test methods and design rules for TRC (Brameshuber [23]).…”

Section: Literature Reviewmentioning

confidence: 99%

Efficient Adaptive Test Method for Textile Development Length in TRC

Ortlepp

2018

Advances in Civil Engineering

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Natural resources can be conserved if we carefully maintain the building stock and indeed extend the useful economic life of buildings. One way to achieve this is to enhance load-bearing structures by repair, restoration, or strengthening. Such upgrading often involves applying a strengthening to existing concrete elements. Over the past decade, textile-reinforced concrete (TRC), encompassing a combination of fine-grained concrete and noncorrosive multiaxial textile fabrics, has emerged as a promising novel alternative for strengthening of conventional steel-reinforced concrete (RC) structures, offering enhanced load-bearing capacity with minimal weight and stiffness change. Although TRC has been extensively researched during the last two decades, the formalization of experimental methods and design standards is still in progress. Attempts to design for good load transfer are often hindered by lack of knowledge regarding bond behaviour. For instance, there are neither standard recommendations nor proofs regarding the required development length of textile fibres in TRC for practical applications up to now. e aim of this work was to provide a test specification, which gives a direct result for the development length (required for the anchorage of a reinforcement, also referred to as "anchorage length") of textile reinforcements in fine-grained concrete-quickly and easily. e aim of this paper was to present the test specification developed in a way that it is useful for the future work of other researchers as well as for construction engineers. Some selected experimental investigations with different textile reinforcements and different bonding properties were performed with the aim of showing the applicability of the proposed adaptive test specification. e results of these tests indicated that conventional AR glass and carbon fabrics without coating required large anchoring lengths. e tests further showed that an additional application of different kinds of coating to textile fabrics greatly increased the reinforcement's resistance to pullout. is is of special interest for carbon fibres, which have a substantially higher strength than AR glass fibres and different bond behaviour; that is, carbon fibres have, by nature, larger development lengths.

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“…Investigations on the results of LVDTs installed on the height of the samples to measure the possible debonding of the rendering mortar from rc frame demonstrated that the detachment along the height of the specimens is similar. The appropriate preparation of concrete surface before applying the rendering mortar according to what is pointed out by Escrig et al (2015) can be assumed as an alternative solution for enhancing the adherence of the rendering mortar to the reinforced concrete frame.…”

Section: Crack Patternsmentioning

confidence: 99%

In-Plane Behavior of Infills using Glass Fiber Shear Connectors in Textile Reinforced Mortar (TRM) Technique

Akhoundi

Vasconcelos

Lourenço

2018

International Journal of Structural Glass and Advanced Material

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Masonry has a widespread use in the construction of the buildings even in reinforced concrete or steel frames. Past earthquakes have demonstrated the vulnerability of masonry infills resulted in the human life losses and economic costs. Recently innovative strengthening techniques such as Textile Reinforced Mortar technique (TRM) is used for enhancing the seismic response of the infills. Different procedures were suggested to enhance the bond between rendering mortar of the TRM technique and infilled frame to prevent its detachment. In this study commercial glass fiber shear connectors were used for connecting the TRM layer to the infilled frame and their response were investigated by testing the samples in the in-plane direction. The quasi static in-plane test was performed cyclically on two specimens; one without strengthening layer and another strengthened with commercial textile meshes. The results showed that TRM technique enhances the in-plane response of the infilled frames but the effectiveness of the shear connectors could be improved using proper materials.

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Experimental and analytical study of reinforced concrete beams shear strengthened with different types of textile-reinforced mortar

Cited by 125 publications

References 21 publications

Axially Loaded RC Walls with Cutout Openings Strengthened with FRCM Composites

Axially Loaded RC Walls with Cutout Openings Strengthened with FRCM Composites

Efficient Adaptive Test Method for Textile Development Length in TRC

In-Plane Behavior of Infills using Glass Fiber Shear Connectors in Textile Reinforced Mortar (TRM) Technique

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