Fire behavior of concrete T-beams strengthened with near-surface mounted FRP reinforcement

2014 ◽  
Vol 80 ◽  
pp. 350-361 ◽  
Author(s):  
B. Yu ◽  
V.K.R. Kodur
Keyword(s):  
Fire Behavior ◽  
Near Surface ◽  
Frp Reinforcement ◽  
Near Surface Mounted

Experimental Study on Flexural Performances of Concrete Beams Strengthened with Near-Surface Mounted (NSM) FRP Reinforcement

2010 ◽  
Vol 163-167 ◽  
pp. 3634-3639
Author(s):  
Li Li Sui ◽  
Tie Jun Liu ◽  
Feng Xing ◽  
Yu Xiang Fu
Keyword(s):  
Experimental Study ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Flexural Stiffness ◽  
Test Results ◽  
Near Surface ◽  
Bending Performance ◽  
Bending Capacity ◽  
Frp Reinforcement ◽  
Near Surface Mounted

This paper illustrates the results of an experimental study on the bending performance of concrete beams strengthened with near-surface mounted (NSM) FRP reinforcement. The critical parameter of the embedded length of NSM-FRP plates was investigated in particularly. The test results indicated that NSM-FRP reinforcement can significantly improve the strength and crack resistance capacity of the concrete beam, reducing the size of cracks. The embedded length of the NSM-FRP plate has distinct influence on the cracking and bending capacity, the flexural stiffness, and the crack developments of the concrete beam. As the embedded length increased, the bending capacity and the flexural stiffness increased correspondingly and the crack developed more intensively.

scholarly journals Characterization and Simulation of the Bond Response of NSM FRP Reinforcement in Concrete

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1770 ◽  
Author(s):  
Javier Gómez ◽  
Lluís Torres ◽  
Cristina Barris
Keyword(s):  
Load Capacity ◽  
Numerical Procedure ◽  
Fiber Reinforced Polymer ◽  
Near Surface ◽  
Bond Slip ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Frp Reinforcement ◽  
Near Surface Mounted ◽  
Shear Stress And Strain

The near-surface mounted (NSM) technique with fiber reinforced polymer (FRP) reinforcement as strengthening system for concrete structures has been broadly studied during the last years. The efficiency of the NSM FRP-to-concrete joint highly depends on the bond between both materials, which is characterized by a local bond–slip law. This paper studies the effect of the shape of the local bond–slip law and its parameters on the global response of the NSM FRP joint in terms of load capacity, effective bond length, slip, shear stress, and strain distribution along the bonded length, which are essential parameters on the strengthening design. A numerical procedure based on the finite difference method to solve the governing equations of the FRP-to-concrete joint is developed. Pull-out single shear specimens are tested in order to experimentally validate the numerical results. Finally, a parametric study is performed. The effect of the bond–shear strength slip at the bond strength, maximum slip, and friction branch on the parameters previously described is presented and discussed.

scholarly journals Crack parameters in normal section of FRP strengthened RC elements

2019 ◽  
Author(s):  
Justas Slaitas ◽  
Juozas Valivonis
Keyword(s):  
Prediction Model ◽  
Crack Width ◽  
Rc Beams ◽  
Near Surface ◽  
Normal Section ◽  
Full Development ◽  
Externally Bonded ◽  
Frp Reinforcement ◽  
Near Surface Mounted ◽  
Element Failure

Contrary to existing studies, this paper presents a prediction model of crack parameters in normal section of FRP strengthened RC elements neglecting crack spacing. A relation between normal crack width, depth and strains in the level of FRP reinforcement, established by Slaitas et al. (Slaitas, Daugevičius, Valivonis, & Grigorjeva, 2018a) and Jokūbaitis et al. (Jokūbaitis & Juknevičius, 2013; Jokūbaitis, Juknevičius, & Šalna, 2013), allowed authors to describe the full development of the crack up to the element failure. Numerical results are compared with experimental ones from the tests of 9 RC beams, strengthened with externally bonded and near surface mounted FRP reinforcements.

scholarly journals Strengthening of Bent LVL Beams with Near-Surface Mounted (NSM) FRP Reinforcement

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2350 ◽  
Author(s):  
Michał Marcin Bakalarz ◽  
Paweł Grzegorz Kossakowski ◽  
Paweł Tworzewski
Keyword(s):  
Bending Moment ◽  
Experimental Tests ◽  
Fiber Reinforced Polymer ◽  
Wood Structures ◽  
Near Surface ◽  
Bending Tests ◽  
Laminated Veneer Lumber ◽  
Reinforced Polymer ◽  
Frp Reinforcement ◽  
Near Surface Mounted

The topic of the article is the analysis of the static work of unreinforced and reinforced with composite material timber beams under bending tests. The results of the experimental tests and a brief outline of the characteristics of the internal reinforcement of wood structures are presented. Experimental tests were performed on full-scale beams made of laminated veneer lumber (LVL) with nominal dimensions of 45 × 200 × 3400 mm. Two strips of carbon fiber-reinforced polymer (CFRP) reinforcement were glued into rectangular grooves in the component bottom with two-component epoxy resin (0.62% reinforcement percentage). The reinforcement mainly affected the enhancement of the maximum bending moment values evaluated at the points of application as having concentrated forces of 32% and 24% in comparison to the unreinforced elements. Increases of 11% and 7% in the global modulus of elasticity in the bending and stiffness coefficients were achieved, respectively. The failure of the reference beams was caused by exceeding the tensile strength of the LVL. The reinforced elements were characterized by a greater variation in failure mode, resulting from tension, compression or lateral torsional buckling. The strain profile reading showed a higher utilization of the compression characteristic of veneer in specimens reinforced with carbon laminates.

Investigations on Bond Performances Between Concrete and Near-Surface Mounted (NSM) FRP Reinforcement

2011 ◽  
Vol 4 (8) ◽  
pp. 3272-3277 ◽  
Author(s):  
Lili Sui ◽  
Xinrui Quan ◽  
Weiwen Li ◽  
Feng Xing
Keyword(s):  
Near Surface ◽  
Frp Reinforcement ◽  
Near Surface Mounted

Prestressed near-surface mounted fibre reinforced polymer reinforcement for concrete structures — a review

2013 ◽  
Vol 40 (11) ◽  
pp. 1127-1139 ◽  
Author(s):  
Raafat El-Hacha ◽  
Khaled Soudki
Keyword(s):  
Near Surface ◽  
Rc Structures ◽  
Reinforced Polymer ◽  
External Prestressing ◽  
Fibre Reinforced Polymer ◽  
Frp Reinforcement ◽  
Near Surface Mounted ◽  
Long Term Performance ◽  
Term Performance

The specialized application of prestressing the near-surface mounted (NSM) fibre reinforced polymer (FRP) reinforcement for strengthening reinforced concrete (RC) structures combines the benefits of the FRP reinforcement with the advantages associated with external prestressing. By applying a prestress to the NSM FRP the material is used more efficiently since a greater portion of its tensile capacity is employed. This paper presents a comprehensive review on the performance of RC members strengthened using prestressed NSM FRP reinforcement. Several techniques and anchorage systems developed to prestress the NSM FRP are presented. The static flexural and fatigue performance of RC beams strengthened using prestressed NSM FRP in comparison to non-prestressed NSM is presented. Research on the long-term performance under freeze–thaw exposures and sustained loading is also presented.

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