Effect of load distribution on the behaviour of RC beams strengthened in flexure with near-surface mounted (NSM) FRP

The contrast tests of 1 reinforced concrete(RC) beams and 4 RC beams strengthened with near-surface mounted carbon fiber reinforced polymer (FRP) strips have been carried out, under conditions of different damage degree of RC beams. It is mainly conducted to investigate the effects of FRP strips reinforcement of flexural strength. The experimental results indicate that significant strength on the ultimate load and rigidity of reinforced concrete beams can be realized by mounting FRP strips to the beams, and propagation of cracks were reduced obviously.

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Experimental Study on Flexural Behavior of Damaged Concrete Beams Strengthened with NSM-CFRP Strips

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.1012 ◽

2012 ◽

Vol 256-259 ◽

pp. 1012-1016

Author(s):

Gu Sheng Tong ◽

Yong Xiang Wang ◽

Qiu Lan Wu ◽

Yong Sheng Liu

Keyword(s):

Failure Modes ◽

Fiber Reinforced Polymer ◽

Flexural Behavior ◽

Rc Beams ◽

Near Surface ◽

Damage Level ◽

Reinforced Polymer ◽

Near Surface Mounted ◽

Strengthen Effect ◽

Capacity Loading

In order to investigate the strengthen effect of different embedment lengths of the NSM strip on different damage levels. A series of tests were conducted on damaged reinforced concrete (RC) beams in flexure strengthened with near surface mounted (NSM) carbon- fiber-reinforced polymer (CFRP) strips, and initial cracking load, ultimate capacity, loading-deflection curves, and failure modes are examined and analyzed in the paper. The results showed that not only the initial cracking loads and ultimate capacities of the beams are significantly increased，but also the flexural stiffness of the beams in the yield and ultimate behavior stages are improved by using NSM-CFRP strips. The strengthen effect on lower damage level RC beams has no obvious difference with that on non-damaged RC beams. Anchoring of the strip end can increase the ultimate load capacities and decrease the ductility of RC beams. Debonding was found to be the primary failure mode in all cases.

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On the strengthening of RC beams with near surface mounted GFRP rods

Composite Structures ◽

10.1016/j.compstruct.2014.06.030 ◽

2014 ◽

Vol 117 ◽

pp. 143-155 ◽

Cited By ~ 17

Author(s):

Roberto Capozucca

Keyword(s):

Rc Beams ◽

Near Surface ◽

Near Surface Mounted

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Effects of tensile reinforcing steel ratio and Near-Surface-Mounted bar development length on the structural behavior of strengthened RC beams

Latin American Journal of Solids and Structures ◽

10.1590/1679-78255836 ◽

2020 ◽

Vol 17 (6) ◽

Author(s):

Hesham EL-Emam ◽

Alaaeldin El-Sisi ◽

Mohamed Bneni ◽

Seleem S. E. Ahmad ◽

Hossam El-Din M. Sallam

Keyword(s):

Structural Behavior ◽

Reinforcing Steel ◽

Rc Beams ◽

Development Length ◽

Near Surface ◽

Steel Ratio ◽

Near Surface Mounted

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A simplified method to predict the fire resistance of RC beams strengthened with near-surface mounted CFRP

Composite Structures ◽

10.1016/j.compstruct.2018.03.035 ◽

2018 ◽

Vol 193 ◽

pp. 1-7 ◽

Cited By ~ 9

Author(s):

Jiangtao Yu ◽

Keke Liu ◽

Ling-zhi Li ◽

Yichao Wang ◽

Kequan Yu ◽

...

Keyword(s):

Fire Resistance ◽

Rc Beams ◽

Near Surface ◽

Simplified Method ◽

Near Surface Mounted

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Modeling of CFRP strengthened RC beams using the SNSM technique, proposed as an alternative to NSM and EBR techniques

Frattura ed Integrità Strutturale ◽

10.3221/igf-esis.54.02 ◽

2020 ◽

Vol 14 (54) ◽

pp. 21-35

Author(s):

Adel Boulebd ◽

Ferhoune Noureddine ◽

Boukhezar Mohcene ◽

Habib Abdelhak Mesbah

Keyword(s):

Finite Element ◽

Failure Mode ◽

Numerical Study ◽

Concrete Cover ◽

Rc Beams ◽

Near Surface ◽

Externally Bonded ◽

Bending Capacity ◽

Near Surface Mounted ◽

Abaqus Software

In this paper, an analytical and numerical study in FEM finite element by the ABAQUS software was conducted. Which aims to study the behaviour of RC beams bending strengthened with SNSM side near surface mounted technique, proposed as a solution to avoid the failure mode by debonding of the strengthening, the disadvantage of the EBR externally bonded reinforced technique, and the failure mode by separation of the concrete cover relative to the NSM near surface mounted technique, by comparing the behaviour of the three techniques, the effect of the quantity of strengthening and confirm the results with the literature. The results of this study show that the numerical and analytical model can predict the behaviour of strengthened RC beams according to the three techniques, a clear improvement of the bending capacity of beams strengthened is noticed. A good preservation of the ductility of SNSM beams with a better failure mode.

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