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

This paper presents the study to find retrofit effect in case of Near-Surface-Mounted Retrofit (NSMR) using Carbon Fiber Reinforcement Polymer (CFRP) plate targeting reinforcement concrete (RC) beam by comparing the previous Externally Bonded Retrofit (EBR) method through experimental analytical works. Three RC beam specimens were made and two of them were retrofitted with CFRP plate by using EBR and NSMR. Also Finite Element (FE) analysis was performed in order to simulate the structural behavior of the beams by considering the bond properties between concrete and CFRP. From the study, it was found that the beam retrofitted with EBR hada reduction of bond capacity in the joint while the beam retrofitted with NSMR had perfect bond capacity.

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Flexural behavior of large-size RC beams strengthened with side near surface mounted (SNSM) CFRP strips

Composite Structures ◽

10.1016/j.compstruct.2018.06.031 ◽

2018 ◽

Vol 201 ◽

pp. 178-192 ◽

Cited By ~ 8

Author(s):

Zewen Zhu ◽

Eryu Zhu

Keyword(s):

Flexural Behavior ◽

Rc Beams ◽

Near Surface ◽

Large Size ◽

Near Surface Mounted

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Experimental and numerical investigation for the flexural strengthening of RC beams using near-surface mounted steel or GFRP bars

Construction and Building Materials ◽

10.1016/j.conbuildmat.2012.09.107 ◽

2013 ◽

Vol 40 ◽

pp. 145-161 ◽

Cited By ~ 31

Author(s):

Tarek H. Almusallam ◽

Hussein M. Elsanadedy ◽

Yousef A. Al-Salloum ◽

Saleh H. Alsayed

Keyword(s):

Numerical Investigation ◽

Rc Beams ◽

Near Surface ◽

Flexural Strengthening ◽

Gfrp Bars ◽

Near Surface Mounted

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Study on Flexural Performance of Damage RC Beams Strengthened with near Surface Mounted FRP Strips

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.94-96.883 ◽

2011 ◽

Vol 94-96 ◽

pp. 883-886 ◽

Cited By ~ 1

Author(s):

Chang Zhou Dong ◽

Jian Zhong Xia

Keyword(s):

Reinforced Concrete ◽

Reinforced Concrete Beams ◽

Rc Beams ◽

Near Surface ◽

Flexural Performance ◽

Damage Degree ◽

Reinforced Polymer ◽

Significant Strength ◽

Near Surface Mounted ◽

Frp Strips

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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