Experimental study of flexural behaviour of RC beams strengthened by longitudinal and U-shaped basalt FRP sheet

Chen, Wensu; Pham, Thong M.; Sichembe, Henry; Chen, Li

doi:10.1016/j.compositesb.2017.09.053

Cited by 119 publications

(45 citation statements)

References 28 publications

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“…Fiber-reinforced polymer (FRP) is widely accepted as an excellent material in structural strengthening and retrofitting because of its high strength-to-weight ratio, good corrosion resistance, and ease of installation (Teng et al, 2002, Teng et al, 2012Baji et al, 2016;Nie et al, 2020;Zhou et al, 2020a). Externally bonded (EB) FRP technique was used for flexural and shear strengthening (Bencardino et al, 2005;Bencardino et al, 2006;Chen et al, 2018;Benzeguir et al, 2020;Chen et al, 2020;Li et al, 2020). Generally, FRP laminates are used for flexural strengthening, and transverse FRP sheets are used for shear strengthening.…”

Section: Introductionmentioning

confidence: 99%

Behaviors of Large-Rupture-Strain Fiber-Reinforced Polymer Strengthened Reinforced Concrete Beams Under Static and Impact Loads

Zhao

Sui

et al. 2020

Front. Mater.

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Reinforced concrete (RC) structures may be damaged seriously when subjected to impact loading, and it is necessary to strengthen existing structures to improve their impact resistance. Large-rupture-strain fiber-reinforced polymer (LRS-FRP) is a promising material to strengthen RC structures under impact because of its good deformation capacity. This article shows experimental studies on performance of LRS-FRP strengthened RC beams under static and impact loads. The effects of FRP types, loading rate, and the usage or nonusage of end-anchorages on the strengthening efficiency were investigated. The experiment demonstrates LRS-FRP laminate with end-anchorage (EA) to be an appropriate strengthening technique for RC beams under both static and impact loading. The beams strengthened with end-anchored LRS-FRP presented greater ductility than their carbon fiber-reinforced polymer counterpart under static loading, and the end-anchored LRS-FRP strengthening system reduced the maximum deflection and damage of strengthened beam under impact significantly. However, the end-anchorage was more susceptible to damage and failure when the loading rate increased from static to impact. Therefore, the endanchorage and the end-anchorage-FRP connection should be designed with caution for impact condition.

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Section: Introductionmentioning

confidence: 99%

Behaviors of Large-Rupture-Strain Fiber-Reinforced Polymer Strengthened Reinforced Concrete Beams Under Static and Impact Loads

Zhao

Sui

et al. 2020

Front. Mater.

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“…Substantial laboratory experiments and organized research has been carried out on the flexural and shear behavior of Reinforced Concrete Beam (RCB) by utilizing different materials and bonding techniques. For instance, Carbon Fiber Reinforced Polymer (CFRP) sheets and epoxy mortar (Bahn and Harichandran, 2008), Glass Fiber Reinforced Polymer (GFRP) (Chiew et al, 2007), strain-hardening cement-based composite (Kim et al, 2011), longitudinal and U-shape basalt Fiber Reinforced Polymer (FRP) sheets (Chen et al, 2018), aluminum alloy plates (Rasheed et al, 2017), wire mesh-epoxy composites applied in the form of laminates (Qeshta et al, 2015), reinforced concrete beam-column joints strengthened with steel cage (Campione et al, 2015), CFRP grid-reinforced engineered cementitious composite matrix (Yang et al, 2018), and hybrid carbon sheets (Zhang et al, 2017) have been used as a mean of improving the performance of RC structural members. However, each technique has some limitations, material availability issues, and implementation problems.…”

Section: Introductionmentioning

confidence: 99%

Strengthening and Characterization of Existing Reinforced Concrete Beams for Flexure by Effective Utilization of External Steel Elements

Gul

Alam

Ahmed

et al. 2020

Advances in Structural Engineering

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Strengthening of structural members is a common practice around the world that may arise due to deterioration of concrete with age or upgradation of design code. This paper aims to elucidate a technique used for strengthening of the reinforced concrete beam for flexural capacity by using externally welded steel angles and steel bars. For this motive, three beams were strengthened with external steel angles and three with external steel bars. The external strengthening steel elements were attached at the bottom of the beam with shear reinforcement. Control samples without external steel angles and steel bars for comparison purposes were also prepared. All reinforced concrete beams were first constructed using a concrete ratio of 1:2:4, and then external steel elements were added to existing flexural reinforcement by using a fillet weld with tee joints having thickness and length of 5/16" (7.9 mm) and 6" (152.4 mm), respectively. Fourth point loading criteria were used to investigate the flexural capacity of beams in positive bending. All beams were designed strong enough in shear, to resist the ultimate loads without shear failure. Test results indicated that beams strengthened with this technique have an average increase of 238% with steel angles and 106% with steel bars, in load-carrying capacity than control samples. Strengthened beams showed a uniform crack pattern. Moreover, the concrete cover made a good bond with existing concrete and was strong enough to withstand ultimate loads. Conclusively, the steel angles and steel bars can be used as an external strengthening material, to enhance the flexural capacity of reinforced concrete beams.

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“…Besides that, the ACI 440.2R-17 (ACI, 2017) recommendation on the use of anchorage at the lateral faces of the beams (U-anchors), to avoid rupture by detachment of the strengthening, also motivated this study. Chen, Pham, Sichembe, Chen, and Hao (2018) explain that the U-anchors increase the capacity of the composite that is used, that is, increase the use of the elongation strain capacity, leading to higher ductility. D'Antino and Triantafillou (2016) analyzed the accuracy of analytical models widely used in order to evaluate the flexural and shear contributions provided by the FRP.…”

Section: Introductionmentioning

confidence: 99%

Analysis of reinforced concrete beams strengthened with different CFRP lengths

Silva¹,

Cabral²,

Júnior³

et al. 2019

Acta Sci. Technol.

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The application of carbon fiber reinforced polymers (CFRP) as method of strengthening for concrete structures is replacing the conventional strengthening through the bonding of steel plates. However, since it is a recent technique, several codes from different countries still do not consider this type of strengthening. In this work, seven reinforced concrete beams were tested and analyzed. One was used as a reference beam and six were strengthened through the application of CFRP, with some variations regarding the strengthening, with the aim of verifying the efficiency of each system compared to the reference beam. For the computational analysis, the software ANSYS was used along with the plugin ACP (ANSYS Composite PrepPost), by comparing the results obtained in the simulation of the experimental results. Through the laboratory tests and the finite element simulation, it was concluded that the strengthening was efficient in all situations, but it was less efficient in cases where the strengthening was extended to the regions of simple flexure without proper anchorage. It was also possible to notice that the behavior of the simulated beams properly represented the reality, with the beams behaving comparably to the beams of the experimental test.

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Experimental study of flexural behaviour of RC beams strengthened by longitudinal and U-shaped basalt FRP sheet

Cited by 119 publications

References 28 publications

Behaviors of Large-Rupture-Strain Fiber-Reinforced Polymer Strengthened Reinforced Concrete Beams Under Static and Impact Loads

Behaviors of Large-Rupture-Strain Fiber-Reinforced Polymer Strengthened Reinforced Concrete Beams Under Static and Impact Loads

Strengthening and Characterization of Existing Reinforced Concrete Beams for Flexure by Effective Utilization of External Steel Elements

Analysis of reinforced concrete beams strengthened with different CFRP lengths

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