Flexural and shear strengthening of timber beams using glass fibre reinforced polymer bars — an experimental investigation

2004 ◽  
Vol 31 (1) ◽  
pp. 45-55 ◽  
Author(s):  
D Svecova ◽  
R J Eden
Keyword(s):  
Glass Fibre ◽  
Experimental Program ◽  
Shear Strengthening ◽  
Near Surface ◽  
Flexural Strengthening ◽  
Gfrp Bars ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced

An experimental program was undertaken at The University of Manitoba to test timber stringers strengthened with glass fibre reinforced polymer (GFRP) bars. Various strengthening schemes were investigated as a means of increasing the load carrying capacity of timber stringers in shear and flexure. The shear strengthening was achieved by inserting GFRP dowels in the centre of the cross section along the length of the stringers. The flexural strengthening used the concept of near-surface-mounted GFRP bars. Fifty beams were tested to evaluate the performance of the various strengthening schemes. The behaviour of the beams is described in terms of mode of failure, mechanical properties, and load–deflection behaviour. This study found that strengthening timber stringers with GFRP reinforcement increased the ultimate strength of the stringers and reduced its variability. It is believed that the shear and flexural GFRP reinforcements act as a truss member within the timber beam and bridge the local defects and discontinuities of the timber.Key words: timber, glass fibre reinforced polymer, bridge, stringers, dowels, strengthening, ductility.

Pendulum impacts into concrete bridge barriers reinforced with glass fibre reinforced polymer composite bars

2004 ◽  
Vol 31 (4) ◽  
pp. 539-552 ◽  
Author(s):  
Ehab El-Salakawy ◽  
Radhouane Masmoudi ◽  
Brahim Benmokrane ◽  
Frédéric Brière ◽  
Gérard Desgagné
Keyword(s):  
Glass Fibre ◽  
Impact Test ◽  
Full Scale ◽  
Concrete Bridge ◽  
Conventional Steel ◽  
Gfrp Bars ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced

This paper presents the results of a pendulum impact test that was carried out on full-scale types PL-2 and PL-3 concrete bridge barriers reinforced with glass fibre reinforced polymer (GFRP) bars. A new corrosion-free connection between the barrier wall and the slab using GFRP bent bars was investigated. For comparison purposes, the impact test was also performed on identical concrete barriers reinforced with conventional steel. A total of eight full-scale 10-m-long barrier prototypes were constructed and tested. The tests included four PL-2 and four PL-3 prototypes. For each type of barrier, two prototypes were reinforced with GFRP sand-coated bars and the other two were reinforced with steel bars. Pendulum crash tests using a 3.0-t pear-shaped iron ball were performed under the same conditions for each type of barrier. The behaviour of the barriers was evaluated in terms of cracking pattern, crack width, and strains in reinforcing bars. The results of this investigation led to the conclusion that the behaviour of PL-2 and PL-3 concrete bridge barriers reinforced with GFRP bars is very similar to that of their counterparts reinforced with conventional steel in terms of cracking, energy absorption, and strength.Key words: concrete bridges, bridge barriers, glass FRP bars, impact, pendulum crash test.

Strengthening of dapped timber beams using glass fibre reinforced polymer bars

2004 ◽  
Vol 31 (6) ◽  
pp. 943-955 ◽  
Author(s):  
K Amy ◽  
D Svecova
Keyword(s):  
Glass Fibre ◽  
Total Sample ◽  
Modulus Of Rupture ◽  
Experimental Program ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Bending Load ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
Timber Beams

An economical rehabilitation scheme to strengthen creosote-treated dapped timber stringers in both flexure and shear is proposed. An experimental program was conducted to test stringers under monotonic load in three-point bending load configuration. Eight control beams with no reinforcement, 12 reinforced for flexure only, and 6 reinforced for flexure and shear were tested. Glass fibre reinforced polymer (GFRP) dowel bars were placed at an angle of 60° from the horizontal to reinforce for shear and to bridge the dapped end. Test results from previous studies by Gentile et al. (C. Gentile, D. Svecova, and S.H. Rizkalla. ASCE Journal of Composites for Construction, 6(1): 11–20, 2002.) and Svecova and Eden (D. Svecova and R.J. Eden. Canadian Journal of Civil Engineering, 31: 45–55, 2004) are combined with the results of this investigation for a total sample size of 54 beams. Large sample sizes are essential to study the performance of timber beams strengthened using GFRP bars in various schemes. An overall increase of 70% in the 10th percentile ultimate strength was obtained for stringers reinforced for both flexure and shear. Ductility was increased with the addition of the GFRP reinforcement, but the modulus of elasticity appeared to be unaffected.Key words: timber, bridge, glass fibre reinforced polymer, rehabilitation, modulus of rupture, analysis.

scholarly journals Comparison of Tensile Properties of Glass Fibre Reinforced Polymer Rebars by Testing According to Various Standards

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4110
Author(s):  
Agnieszka Wiater ◽  
Tomasz Siwowski
Keyword(s):  
Tensile Properties ◽  
Glass Fibre ◽  
Standardized Test ◽  
Test Procedure ◽  
Test Procedures ◽  
Gfrp Bars ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced

The widespread use of glass fibre reinforced polymer (GFRP) bars in reinforced concrete (RC) elements has yet been limited due to the anisotropic and non-homogeneous material behaviour of GFRP. The material characteristics of GFRP bars from different manufacturers vary as a function of several factors. Several standards have developed various procedures to investigate the mechanical characteristics of GFRP bars, but universal methods to test different types and diameters of GFRP bars in tension have not been fully developed. Due to the lack of such a standardized test procedure, there are some doubts and gaps in terms of the behaviour of GFRP bars in tension, which has led to lack of reliable information on their tensile properties. The determination of tensile characteristics of GFRP bars, including the tensile strength, modulus of elasticity, and ultimate strain, according to various test standards, is the main subject of the paper. This paper reports test results for tensile characterization obtained on four types of GFRP bars from four manufacturers with six various diameters. Moreover, the study compares various test procedures according to seven standards to characterize the tensile properties of GFRP bars, to examine the proposed test procedures, and to reveal main differences.

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