Flexural and Shear strengthening of RC beams with NSM technique-manually made CFRP bars

This paper investigates the effectiveness of fabric reinforced cementitious matrix (FRCM) systems in shear-strengthening of reinforced concrete beams. Three types of FRCM systems were considered, namely, polyparaphenylene benzobisoxazole (PBO)-FRCM, Carbon-FRCM, and Glass-FRCM. At first, tensile characterization test was performed on 15 FRCM coupons with the aim of identifying the tensile properties of the FRCM systems adopted. After that, seven shear-critical RC beams were tested under three-point loading, with the consideration of two test parameters: (a) FRCM material (glass/carbon/PBO); and (b) strengthening configuration (full/intermittent). The study results revealed the use of FRCM as a strengthening material to achieve a considerable improvement in the structural capacity of shear-critical RC beams. The average gain in the shear capacity of the FRCM-strengthened beams was 57%. The beam specimens strengthened with carbon-FRCM showed the highest improvement as compared to those strengthened with glass-and PBO-FRCM systems. As intuitively expected, the shear capacity improvement achieved with the full-length strengthening systems was generally higher than that with the intermittent counterparts.

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An experimental approach for shear strengthening of RC beams using a proposed technique by embedded through-section FRP sheets

Composite Structures ◽

10.1016/j.compstruct.2020.111988 ◽

2020 ◽

Vol 238 ◽

pp. 111988 ◽

Cited By ~ 5

Author(s):

E. Moradi ◽

H. Naderpour ◽

A. Kheyroddin

Keyword(s):

Experimental Approach ◽

Rc Beams ◽

Shear Strengthening

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Shear Strengthening of RC Beams Subjected to Cyclic Load Using CFRP Strips

Advanced Composites Letters ◽

10.1177/096369350801700604 ◽

2008 ◽

Vol 17 (6) ◽

pp. 096369350801700 ◽

Cited By ~ 1

Author(s):

Gokhan Sakar

Keyword(s):

Cyclic Load ◽

Concrete Beam ◽

Reinforced Concrete Beam ◽

Rc Beams ◽

Carbon Fabric ◽

Shear Strengthening ◽

Shear Design ◽

Beam Shear ◽

Fabric Shear ◽

Composite Carbon

An experimental investigation was conducted to study the effect of composite carbon fabric shear reinforcement on the ultimate strength and behaviour of reinforced concrete beam. Shear deficient specimens were strengthened by using side-bonded and wrapped CFRP straps. Eight beams were fabricated and tested under the cyclic loads. The main objective of the study is to obtain ductile flexural behaviour from the shear deficient RC beams. To verify the reliability of shear design equations and guidelines, experimental results were compared with all common guidelines and published design equations.

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Embedded Connector in Severe Optimization of Steel Plate for Shear Strengthening of RC Beam: Experimental and Numerical Investigations

Advances in Civil Engineering ◽

10.1155/2018/4721431 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Md. Ashraful Alam ◽

Suliman A. Bakkar ◽

Shahnawaz A. Onik ◽

Kamal N. Mustapha

Keyword(s):

Shear Failure ◽

Steel Plate ◽

Maximum Load ◽

Rc Beams ◽

Reinforced Concrete Structure ◽

Shear Strengthening ◽

Maximum Increase ◽

Numerical Investigations ◽

Externally Bonded ◽

Major Factors

Environmental impact has become one of the major factors taken into consideration for recent civil engineering studies and projects. Thus, researchers have been concentrating on shear strengthening of existing reinforced concrete structure as an upgrade method instead of demolishing and reconstructing. In general, shear strengthening of RC beams using externally bonded steel plate has gained huge popularity. However, premature debonding of plates is the main drawback of the system, which could be mitigated using embedded connector; thus, the dimension of steel plate could be reduced significantly. Furthermore, numerical analysis on shear strengthening of beams using embedded connector would provide a great insight on the structural behavior. The aim of this research is to severely reduce the dimension of the steel plate using embedded connector for shear strengthening of RC beams and to investigate the performances of optimized shear-strengthened beams through experimental and numerical investigations. The results showed that the dimension of plate was reduced without debonding of the plate if the beam was designed for shear strengthening with the consideration of yield strength of steel plate and shear link. Experimental results showed a maximum increase in failure of 24%. The numerical results predicted accurately the structural performance of beams. The embedded connector had a great effect in deferring and minimizing the debonding failure and accordingly increasing the maximum load of shear failure between 14.5% and 24% compared to control beam.

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FINITE ELEMENT MODELLING OF 2-SPAN CONTINUOUS RC BEAMS SHEAR STRENGTHENED AND SHEAR REPAIRED WITH CFRP STRIPS

Jurnal Teknologi ◽

10.11113/jt.v78.8353 ◽

2016 ◽

Vol 78 (5) ◽

Author(s):

Abdul Aziz Abdul Samad ◽

Noorwirdawati Ali ◽

Noridah Mohamad ◽

J. Jayaprakash ◽

Tuan Duc Ngo ◽

...

Keyword(s):

Finite Element ◽

Reinforced Concrete ◽

Shear Behaviour ◽

Rc Beams ◽

Shear Strengthening ◽

Existing Structures ◽

Finite Element Software ◽

Externally Bonded ◽

Carbon Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer

Strengthening of reinforced concrete (RC) continuous beams in shear have received very little attention among researchers even though most existing structures are in the form of continuous condition such as part of a floor-beam system. Therefore, in order to address the gap, a study on shear strengthening and shear repair of reinforced concrete continuous beam using Carbon Fibre Reinforced Polymer (CFRP) strips was conducted [15]. The validation of the experimental results was conducted with a simulation study using a finite element software ATENA v4 [16]. The research variables were number of layers of CFRP strips (one or two layers), wrapping schemes (four sides or three sides) and orientation of CFRP strips (0/90 or 45/135 degree’s). From the analysis of the finite element results, ATENA shows it has successfully simulated the shear behaviour of strengthened and repaired of 2-span continuous RC beams externally bonded by CFRP strips.

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