Torsional improvement of reinforced concrete beams using ultra high-performance fiber reinforced concrete (UHPFC) jackets – Experimental study

Mohammed, Thaer Jasim; Bakar, B.H. Abu; Bunnori, Norazura Muhamad

doi:10.1016/j.conbuildmat.2015.12.160

Cited by 70 publications

(29 citation statements)

References 18 publications

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“…en, the steel is activated, and the load stabilises with the behaviour becoming more ductile. Also, Figure 7 shows that increasing the layer thickness of UHPFRC increases the torsional load of the RC beams as proved by Mohammed [3].…”

Section: Effect Of Uhpfrc Layer Ickness On Ultimate Loadmentioning

confidence: 69%

“…e torsion strength test conducted by Mohammed et al [3] on RC beams, which were strengthened with UHPFRC jacketing using different strengthening configurations, showed varying cracking and ultimate torque enhancement. Furthermore, beams were strengthened at all four sides showing the highest level of enhancement, as clearly illustrated in Figure 5.…”

Section: Effect Of Strengthening Configurationmentioning

confidence: 99%

“…Lampropoulos et al [13] demonstrated that using a layer of UHPFRC at different locations, as strengthened materials of RC beams, could increase the ultimate flexural strength of all of the strengthened beams. Mohammed et al [3] tested many RC beam specimens strengthened with UHPFRC under torsional loading. e beams had no stirrups.…”

Section: Literature Review Of Existing Studiesmentioning

confidence: 99%

“…Ruano et al [35] evaluated the structural performance of using steel fibre-reinforced concrete (SFRC) in the shear retrofitting of the RC beams. In order to evaluate the contribution of the fibre content, different dosages of fibre were used (30 kg/m 3 and 60 kg/m 3 ). e experimental results proved that the presence of fibres prevents debonding and generally enhances the overall integrity of the beams.…”

Section: Literature Review Of Existing Studiesmentioning

confidence: 99%

“…In any case, making repairs with CFRP involves deficiencies, which prevent the implementation of CFRP in compression under cyclic loading. is behaviour relies upon the strength of the parent concrete, the CFRP concrete bonds, and their durability [3]. erefore, a newer material was created and utilized for both the repair and strengthening of damaged or new RC structural members, which is known as ultrahighperformance fibre-reinforced concrete (UHPFRC).…”

Section: Introductionmentioning

confidence: 99%

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Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Al‐Osta

2018

Advances in Civil Engineering

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e repair and strengthening of reinforced concrete members are very important due to several factors, including unexpected increases in load levels and/or the damaging impact of aggressive environmental conditions on structural concrete members. Many researchers have turned to using materials for the repair and strengthening of damaged structures or the construction of new concrete structural members. Ultrahigh-performance fibre-reinforced concrete (UHPFRC), characterized by superior structural and durability performance in aggressive environmental conditions, is one of the materials that have been considered for the repair and strengthening of concrete structural members. e repair or strengthening of concrete structures using UHPFRC needs a thorough knowledge of the behaviour of both the strengthening material and the strengthened concrete structure at service load conditions, in addition to an understanding of the design guidelines governing the use of such materials for effective repair and strengthening. In this study, the recent issues and findings regarding the use of UHPFRC as a repair or strengthening material for concrete structural members are reviewed, analysed, and discussed. In addition, recommendations were made concerning areas where future attention and research on the use of UHPFRC as a strengthening material needs to be focused if the material is to be applied in practice.

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Section: Effect Of Uhpfrc Layer Ickness On Ultimate Loadmentioning

confidence: 69%

Section: Effect Of Strengthening Configurationmentioning

confidence: 99%

Section: Literature Review Of Existing Studiesmentioning

confidence: 99%

Section: Literature Review Of Existing Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Al‐Osta

2018

Advances in Civil Engineering

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Shear strengthening of reinforced concrete beams using prefabricated ultra‐high performance fiber reinforced concrete plates: Experimental and numerical investigation

Sakr

Sleemah

Khalifa

et al. 2019

Structural Concrete

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This paper presents the efficiency of using prefabricated ultra‐high performance fiber reinforced concrete (UHPFRC) plates in shear strengthening of reinforced concrete (RC) beams experimentally and numerically using finite element method. In order to ensure high quality and facilitate the strengthening process on site applications, it has been considered to apply UHPFRC as a plate pasted on concrete surface using epoxy. Tested specimens included four strengthened beams besides three control beams. Strengthening the RC beams was based on the use of two different techniques; (a) one longitudinal side strengthening (b) two longitudinal sides strengthening. Moreover, strengthening RC beams with reinforced or non‐reinforced prefabricated UHPFRC plates was also investigated. Results show that UHPFRC plates significantly increased the maximum load capacity, ductility and mid span reinforcement strain of the strengthened RC beams comparing with reference beam failed in shear. Also, steel connectors used in reinforcement of UHPFRC plates prevented debonding failure mode. A three‐dimensional (3D) finite element model (FEM) of the tested beams was also developed to predict the behavior of these specimens strengthened in shear. The adhesive layer was simulated using cohesive surface model to consider the slippage between concrete surface and UHPFRC plates. Results of the FEM showed good agreement with experimental results, as they were able to predict the behavior of the beams with high accuracy.

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Experimental study and calculation method on the flexural resistance of reinforced concrete beam strengthened using high strain‐hardening ultra high performance concrete

Sun

Liu

2021

Structural Concrete

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In this study, the efficiency of using high strain hardening ultra high performance concrete (HSH‐UHPC) on strengthening existing reinforced concrete beams was investigated by experimental and analytical means. First, the HSH‐UHPC constitutive relation was obtained using “Dog‐bone” specimen under uniaxial tensile test. Then three reinforced concrete beams strengthened with HSH‐UHPC layers and one control beam were tested under flexural loading. The midspan deflection, strain distribution, crack propagation and failure mode of the tested beams were described in detail. The tests verified that the middle section of UHPC‐NC composite beam basically conforms to the assumption of plane section. The flexural resistance of composite structure can be greatly improved by installing proper longitudinal reinforcement in UHPC layer. Meanwhile, numerical studies have been conducted on the tested beams using the experimentally obtained constitutive relations. The result shows that the finite element analysis results are consistent with the test results. Finally, a contribution factor for the HSH‐UHPC layer on the flexural resistance of the composite beam was proposed. At the same time, it is found that the contribution efficiency of the HSH‐UHPC to the flexural resistance increases with longitudinal reinforcement ratios in the HSH‐UHPC.

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Torsional improvement of reinforced concrete beams using ultra high-performance fiber reinforced concrete (UHPFC) jackets – Experimental study

Cited by 70 publications

References 18 publications

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Shear strengthening of reinforced concrete beams using prefabricated ultra‐high performance fiber reinforced concrete plates: Experimental and numerical investigation

Experimental study and calculation method on the flexural resistance of reinforced concrete beam strengthened using high strain‐hardening ultra high performance concrete

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