Flexural behavior of reinforced concrete beams strengthened with ultra-high performance fiber reinforced concrete

Al‐Osta, Mohammed A.; Isa, M.N.; Baluch, Mohammed H.; Rahman, Muhammad K.

doi:10.1016/j.conbuildmat.2016.12.094

Cited by 277 publications

(146 citation statements)

References 14 publications

Supporting

Mentioning

124

Contrasting

Unclassified

Order By: Relevance

“…To the authors' best knowledge most of researchers who studied strengthening of RC beams using UHPFRC material numerically assumed perfect bond between RC beam surface and UHPFRC layers or plates which neglect the slippage between concrete and UHPFRC and cannot capture the debonding failure mode. Herein, the cohesive surface model proposed by Sakr was used to model the adhesive surface behavior, in the following section there is a brief discussion explaining the cohesive surface model.…”

Section: Numerical Investigationmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Numerical Investigationmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…e experimental results showed that the improvement in strength is dependent on the thickness of the strengthening layer (SHLSCC layer) in the tension zone. Al-Osta et al [23] investigated the flexural behaviour of RC beams retrofitted with UHPFRC. Two different Advances in Civil Engineeringtechniques for the strengthening of RC beams using UHPFRC with different configurations were assessed in this research.…”

Section: Literature Review Of Existing Studiesmentioning

confidence: 99%

“…e following recommendations are suggested for better understanding of the potential of UHPFRC in repairing and strengthening, as well as the behaviours of the Figure 9: E ect of steel bre content on (a) exural capacity and sti ness of strengthened RC beams [13,23,27] and (b) shear capacity [39]. …”

Section: Recommendations For Future Studiesmentioning

confidence: 99%

“…e roughness degree of NCSS became irrelevant to achieve a good strength of bond if the appropriate wetting conditions take place [20]. Al-Osta et al [23] evaluated the bond strength between UHPFRC and NC by conducting bond tests such as the split cylinder tensile strength test and the slant-shear test. Epoxybonded (EP), plane surface, and sandblasted (SB) hybrid cylinder specimens were tested in the current research work.…”

Section: Fire Resistancementioning

confidence: 99%

See 1 more Smart Citation

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

Al‐Osta

2018

Advances in Civil Engineering

View full text Add to dashboard Cite

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.

show abstract

“…The formation of plastic hinge must be avoided since it is harmful for the entire structure. Thus, BC joints are intended to have adequate strength and stability to ensure the structural safety [5]. Structural Strength and ductility will be based on proper detailing of the reinforcement in the joints.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Fibre-Reinforced Concrete Beam-Column Joint with Ductile Detailing Under Reverse Cyclic Loading

Das¹,

Choudhury²

2018

IJET

View full text Add to dashboard Cite

The behaviour of a beam-column (BC) joint in a moment resisting framed structure is the key criteria when the structure is subjected to seismic loading. In the past many research have been carried out to grasp the mechanism of failure of beam-column joint and methods to enhance the performance of beam-column joint have been developed. The provision of ductile detailing as prescribed in IS-13920: 1993 has been followed. Improvement of the performance of joint region has been studied by using additional reinforcement with different fibres. In the present study the performance of the BC joint is studied in terms of load vs. displacement curve, stiffness degradation vs. drift angle curve and energy dissipation by the BC joint using different types of fibres in the specimen. The laboratory testing of the concrete cubes and cylinders reinforced with different percentages of fibre volume have been implemented. Based on the test results, the selection of the optimum quantity of fibre that can be used in beam-column joint for each type of fibre has been done. The testing of the specimens of BC joints is carried out in cyclic actuator of capacity 100 kN. The fibres which have been used in the present study are carbon fibre, steel fibre and glass fibre. Percentages of the fibres that had been added to the specimen are carbon fibre (0.75%), steel fibre (0.75%) and glass fibre (0.50%) respectively and the control specimen made from ordinary concrete made of M25 mix concrete. The performance of the specimens reinforced with different type of fibres is then compared and the specimen showing desirable performance under cyclic loading is found out. It has been observed that the application of carbon fibres could improve the strength and ductility of BC joints appreciably.

show abstract

Flexural behavior of reinforced concrete beams strengthened with ultra-high performance fiber reinforced concrete

Cited by 277 publications

References 14 publications

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

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

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

Experimental Study on Fibre-Reinforced Concrete Beam-Column Joint with Ductile Detailing Under Reverse Cyclic Loading

Contact Info

Product

Resources

About