Abstract
Glass Fiber Reinforced Polymer (GFRP) rebars have been widely used to solve the corrosion problem of steel bars in concrete structures. It has been produced as a lightweight and corrosion-resistant than steel reinforcement in many structural applications. They are regarded as a promising substitute for steel bars in concrete infrastructures. It is necessary to test GFRP bars to fully understand their material properties to ensure the safe and efficient use of the material. In this study, five specimens of each type of GFRP bars with a diameter of 6, 8, 10, 12, and 14 mm were tested under tension. Therefore, a total of 25 samples were examined from the same manufacturer. According to ASTM’s recommendations (D7205/D7205M-06) for tensile tests of GFRP bars, the diameter and thickness of the steel pipes for both ends were considered in the preparation of the test specimens to keep the GFRP bars consistent and aligned throughout the experiment. The experimental test results included the stress-strain curves, tensile strength, ultimate strain, and modulus of elasticity. The study showed an accurate result that indicated the tensile strength of the GFRP bars can be expressed by a linear distribution. For a bar diameter of 10mm, the length to diameter ratio L e /d b =8 showed a maximum tensile to compressive strength ratio. In the failure results of the test, there were two-mode failures of GFRP bars: fracture failure and pull-out failure of GFRP bars. Most of the specimens had GFRP bar fracture failures, only two specimens (GBT1-10-2 and GBT1-10-3) were damaged due to the pull-off of the GFRP bars which was not a typical failure mode. Keywords: GFRP Bars, Tensile Test, Stress-Strain Curve, Fracture Failure DOI: 10.7176/CER/13-5-05 Publication date: August 31 st 2021
Highlights
Structural engineers are frequently faced with repairing components of civil infrastructures
It is widely accepted that a Glass Fiber Reinforced Polymer (GFRP) RC section would need to be over-reinforced for most structural applications, which corresponds to a reinforcement ratio greater than about 0.5 percent for GFRP bars [6]
The lateral containment of the steel rings filled with an adhesive provided by the end of the GFRP bar helps to prevent localized crushing of the ends of the GFRP bar
Summary
Structural engineers are frequently faced with repairing components of civil infrastructures. Over time it was revealed that this method suffered from several disadvantages, such as the difficulty of the installation, the complexity of handling, and the corrosion susceptibility [1] To solve this problem, an externally bonded fiber-reinforced polymer (FRP) reinforcement is being researched and used to repair and rehabilitate damaged concrete structures as an alternative to the steel plate bonding repair process [1]. Glass fiber reinforced polymer bars are increasingly used by engineers when designing structures because of their excellent strength properties This material strength is characterized by its capacity to bear a load without excessive deformation or failure [3]. GFRP (glass fiber reinforced polymer) composites are widely used in the manufacturing industries especially in the aircraft, aerospace, and automotive industries due to their outstanding mechanical and thermal properties such as more specific strength, better specific elasticity modulus, high damping factor, or damping capacity, better corrosion resistance, efficient fatigue resistance, and low thermal expansion coefficient. The results obtained throughout this study characterize the tensile behavior of GFRP bars and present an experimental study to examine the proposed test method that addresses the issues
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