Experimental study of RC deep beams with opening and FRP composites installed by means of EBR and EBROG methods

Arabzadeh, Abolfazl; Karimizadeh, Hamid

doi:10.1016/j.conbuildmat.2019.03.055

Cited by 29 publications

(30 citation statements)

References 28 publications

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“…In this study, 0.21-mm thick woven carbon fiber fabrics that consisted of 3k filaments were used as reinforcement. The average density of the carbon fiber fabrics was 1.76 g/cm 3 . The tensile strength, elastic modulus, and ultimate tensile strain of the carbon-fiber fabrics were 3530 MPa, 230,000 MPa, and 1.5%, respectively, as provided by the manufacturer.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…where n is the number of plies, A w (= 198 g/m 2 ) is the fiber areal weight, ρ f (= 1.76 g/cm 3 ) is the fiber density, and h is the specimen thickness. In the case of the first series, the carbon fiber volume fractions of CFRP0-0, S-MWCNT-COOH-CFRP0-0, MWCNT-CFRP0-0, and GnPs-CFRP0-0 were 40.61%, 39.31%, 38.35%, and 39.94%, respectively.…”

Section: Carbon-fiber Volume Fractionmentioning

confidence: 99%

“…In addition, FRP composites have lower weights than those of other conventional construction materials. Due to the various advantages of FRP materials, they are globally used in various engineering fields [1][2][3][4]. However, from a mechanical viewpoint, FRP composites show complex failure modes such as matrix cracking, fiber rupture, and interlaminar delamination; therefore, their performance is limited [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Mode I Fracture Toughness of Woven Carbon Fiber-Reinforced Polymer Composites Incorporating Nanomaterials

2020

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This study experimentally investigated the effects of nanomaterials and interface fiber angle on the mode I fracture toughness of woven carbon fiber-reinforced polymer (CFRP) composites. Three different types of nanomaterials were used: COOH-functionalized short multi-walled carbon nanotubes (S-MWCNT-COOH), multi-walled carbon nanotubes (MWCNTs), and graphene nanoplatelets (GnPs). Double cantilever beam specimens were composed of 12 woven carbon fiber fabrics with/without 1 wt% nanomaterials, and were manufactured using the hand lay-up method. Furthermore, two different stacking sequence series were used; the first series comprised only on-axis carbon-fiber fabrics (0° or 90°), and the second series comprised both on- and off-axis carbon-fiber fabrics (0° or 90° and ±45°). The test results showed that adding S-MWCNT-COOH, MWCNTs, and GnPs significantly increased the mode I fracture toughness of the CFRP composites for both the stacking sequence series. Moreover, the specimens that used only on-axis carbon fiber fabrics exhibited higher fracture toughness values than those of the specimens that used on- and off-axis carbon fiber fabrics together. In addition, an empirical model was established to predict the fracture toughness of the CFRP composites with nanomaterials by using on- and off-axis carbon fiber fabrics together, and the prediction results showed a good agreement with the experimental results.

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Section: Materials Propertiesmentioning

confidence: 99%

Section: Carbon-fiber Volume Fractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on Mode I Fracture Toughness of Woven Carbon Fiber-Reinforced Polymer Composites Incorporating Nanomaterials

2020

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“…In our literature review, it has been pointed out that the openings diminish RC deep beams' bearing capacity [29][30][31]. Openings of RC deep beams can be used to pass electrical, mechanical, and architectural equipment.…”

Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Different Types of FRP Wrapping in Repairing of RC Deep Beams with Circular Openings

Rahimi

Jalali

Mirhoseini³

et al. 2021

IJE

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Openings of reinforced concrete (RC) deep beams can be used to pass electrical, mechanical, and architectural equipment. A comparative experimental study of fiber reinforced polymer (FRP) type on the performance of deep RC beams with the circular opening was the most important purpose of this study. The variables were FRP type (carbon, glass, and aramid) and the number of layers (1, 2, and 3). The geometric and rebar characteristics of the beams were considered constant in all cases. Deep RC beams were constructed, and their response to four-point loading was evaluated. Depending on the layers (1, 2 and, 3), aramid, carbon and glass fiber reinforced polymers (AFRP, CFRP, and GFRP) sheets increased the maximum load by about 65 to 94%, 87 to 130%, and 133 to 196%, respectively. In RC deep beams retrofitted with GFRP sheets, the sheet separation from the beam surface decreased with expanding the number of layers. The CFRP sheets debonded from the beam surface at the supports along the center of the circular opening. CFRP showed much better performance in energy absorption capacity and load capacity than AFRP and GFRP. The CFRP were debonded from the beam surface at the moment of rupture. However, no significant separation was observed in RC deep beams retrofitted with AFRP and GFRP sheets. SEM images of the cores specimens showed that the fracture surface of the specimens extracted from the beam retrofitted with GFRP and CFRP sheets was much rougher than the control specimen, which indicates a stronger bond between the concrete components.

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“…eir results showed that the FRP strengthening system was rather effective in avoiding shear failure and confining the web chords. In addition to partial reinforcing methods, other scholars [15][16][17] investigated additional strengthening methods to compensate for the effect of web openings.…”

Section: Introductionmentioning

confidence: 99%

Effect of Web Openings on Flexural Behaviour of Underground Metro Station RC Beams under Static and Cyclic Loading

Tingjin

Chen

Feng

et al. 2020

Advances in Civil Engineering

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This paper investigates the influence of multiple transverse web openings on the flexural behaviour of underground metro station reinforced concrete (RC) beams. This problem is outlined with an actual underground engineering project, in which the web opening used in the RC beams violates the current specifications. A total of five beams with different numbers of web openings are fabricated and tested under static and cyclic loading conditions, thereby simulating actual operations in unfavourable conditions. The results suggest that the existence of the openings decreases the loadbearing capacity, ductility, stiffness, and energy dissipation ability of the RC beams. Moreover, the results show that the corners of the openings are the weakest parts of the beams. However, additional reinforcements around the openings can partially mitigate the impact of the openings on the loadbearing and seismic performance of the RC beams. The laboratory experiments presented herein not only provide guidelines for the use of RC beams with web openings in actual engineering projects, especially underground projects where RC beams with web openings have seldom been investigated, but also shed light on improving the related design specifications.

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Experimental study of RC deep beams with opening and FRP composites installed by means of EBR and EBROG methods

Cited by 29 publications

References 28 publications

Investigation on Mode I Fracture Toughness of Woven Carbon Fiber-Reinforced Polymer Composites Incorporating Nanomaterials

Investigation on Mode I Fracture Toughness of Woven Carbon Fiber-Reinforced Polymer Composites Incorporating Nanomaterials

Experimental Comparison of Different Types of FRP Wrapping in Repairing of RC Deep Beams with Circular Openings

Effect of Web Openings on Flexural Behaviour of Underground Metro Station RC Beams under Static and Cyclic Loading

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