scholarly journals Effects of RC beams reinforcement using near surface mounted reinforced FRP composites

2010 ◽  
Vol 8 (2) ◽  
pp. 177-185 ◽  
Author(s):  
Slobodan Rankovic ◽  
Radomir Folic ◽  
Marina Mijalkovic
Keyword(s):  
Fiber Reinforced Polymer ◽  
Rc Beams ◽  
Near Surface ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Reinforced Beams ◽  
Externally Bonded ◽  
Near Surface Mounted ◽  
Basic Characteristics ◽  
Frp Bars

This paper analyzes application of modern reinforcement methods for reinforced concrete (RC) beams using fiber-reinforced polymer (FRP) materials. Basic characteristics of FRP materials and the method of mounting the FRP bars within concrete, that is, near the surface of the beams (NSM method) are presented. The properties of this method and its advantages in comparison to externally bonded reinforcement laminate method (EBR) have been analyzed. The results of measured deflections and width of the cracks of the beams reinforced by FRP bars, depending on the load are presented and discussed, in comparison to the results obtained from the non-reinforced beams. The experimental research was published at the Faculty of Civil Engineering and Architecture of Nis in 2009.

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

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.

Experimental investigation of seismic strengthening of reinforced concrete short columns using externally bonded reinforcement, near surface mounted, and hybrid techniques

2019 ◽  
Vol 54 (9) ◽  
pp. 1177-1195 ◽  
Author(s):  
A Kargaran ◽  
A Kheyroddin
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Polymer ◽  
Dissipated Energy ◽  
Fiber Reinforced ◽  
Near Surface ◽  
Short Columns ◽  
Reinforced Polymer ◽  
Shear Rupture ◽  
Externally Bonded ◽  
Near Surface Mounted

Nowadays, the existence of short columns is a major factor in the failure and collapse of structures during the earthquake. In this article, 10 reinforced concrete short columns are prepared and experimentally investigated under cyclic lateral displacements. Since failure in short columns under earthquake was in the form of diagonal cracks and shear rupture, two new techniques are proposed to strengthen short columns against seismic loads. These techniques include externally bonded reinforcement with carbon fiber-reinforced polymer sheets and near surface mounted with glass fiber-reinforced polymer bars in the form of transverse, diagonal, and hybrid strengthening techniques. The experimental results demonstrated that the above-mentioned strengthening techniques in short columns lead to a change in the type of failure from shear to flexural, and the change of crack patterns and columns failure. The mentioned strengthening methods lead to an increase of ductility, increase of load carrying capacity and increase of dissipated energy.

scholarly journals REVIEW OF THE EFFICIENCY OF REINFORCEMENT BY FIBER REINFORCED POLYMER MATERIALS. FIRE RESISTANCE OF STRUCTURES

2021 ◽  
Vol 6 (2) ◽  
pp. 15-27
Author(s):  
G. Smolyago ◽  
Y. Obernikhina
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Fire Resistance ◽  
Elevated Temperatures ◽  
Fiber Reinforced Polymer ◽  
Polymer Composite Materials ◽  
Near Surface ◽  
Reinforced Polymer ◽  
Externally Bonded ◽  
Near Surface Mounted

Fiber reinforced polymer (FRP) are rapidly gaining popularity in various fields of civil engineering. For decades, these materials have been used to strengthen structures that are not exposed to fire, such as bridges. To apply this reinforcement method to increase the bearing capacity of structures of buildings and structures, fire resistance is an important feature for any material. Due to the small amount of research in this area, there is no technical documentation for these structures that regulates the coupling properties and mechanical characteristics at elevated temperatures necessary for design. There is also a need to develop a simple method for calculating the fire resistance and thickness of an insulating material for a reinforced structure. This article combines existing studies of the operation of fibers and a binder reinforcement system at high temperatures. The article also presents experimental results and numerical studies at elevated temperatures of various authors for isolated and non-insulated reinforced concrete structures reinforced with polymer composite materials. In addition, a comparison of the fire resistance of two main methods of reinforcing polymer composite materials is given: an externally bonded reinforcement and a near surface mounted method. Strengthening structures by near surface mounted method has great advantages compared to strengthening by externally bonded reinforcement.

Behavior of Cantilever RC Beam Support Strengthened with Near-Surface-Mounted FRP Bars

2011 ◽  
Vol 243-249 ◽  
pp. 1762-1766
Author(s):  
Xing Guo Wang ◽  
Jun Hui Yue ◽  
Li Li ◽  
Yu Zhou Zheng
Keyword(s):  
Ultimate Load ◽  
Fiber Reinforced Polymer ◽  
Cantilever Beams ◽  
Near Surface ◽  
Reinforced Polymer ◽  
Sustained Loading ◽  
Steel Bar ◽  
Frp Bar ◽  
Near Surface Mounted ◽  
Frp Bars

Several parameters, including typical loads, deflection, strains of steel bar and fiber- reinforced-polymer(FRP) bar under different sustained loading, were studied. The yield load and ultimate load of cantilever beams strengthened with near-surface-mounted(NSM) FRP bars are improved by 6.0%~15.2% and 55.7%~64.5% compared with non-strengthened beams, respectively. For strengthened beams,sustained loading can weaken the reinforced effect.The flexural behaviors of mounted beams were influenced by the lateral groove .

scholarly journals Strengthening of RC Beams Using Externally Bonded Reinforcement Combined with Near-Surface Mounted Technique

Polymers ◽  
2016 ◽  
Vol 8 (7) ◽  
pp. 261 ◽  
Author(s):  
Kh Darain ◽  
Mohd Jumaat ◽  
Ahmad Shukri ◽  
M. Obaydullah ◽  
Md. Huda ◽  
...  
Keyword(s):  
Rc Beams ◽  
Near Surface ◽  
Externally Bonded ◽  
Near Surface Mounted
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