Title: An Effective Simple Fixture for Testing GFRP Rebars in Compression

Author(s): An Effective Simple Fixture for Testing GFRP Rebars in Compression

Publication: Symposium Paper

Volume: 360

Issue:

Appears on pages(s): 225-241

Keywords: GFRP; Rebar; Test; Compression; Fixture

DOI: 10.14359/51740627

Date: 3/1/2024

Abstract:
The compressive strength of glass fiber-reinforced polymer (GFRP) rebars is investigated and a new test method is proposed. The program consists of three test series. In Test Series 1, the strengths and weaknesses of the test methodology outlined in ASTM D695-15 were explored. Specimens with varying length-to-diameter ratios were prepared and tested. Premature failure was observed, and longitudinal splitting was the dominant failure mode. Test Series 2 aimed to prevent failure initiation at the ends by using steel clamps. The clamps confined the specimen ends and prevented failure propagation. The compressive strengths showed an average of around 70% the tensile strength. In Test Series 3, an advanced fixture was designed to overcome the limitations of the previous series by including clamping parts and vertical steel bars. Three different loading speeds were employed, and an average compressive strength of 75% of the tensile strength was found. The tests were followed by a statistical analysis indicating a significant difference between the results of the three test methods. The proposed test method offers a practical and reusable approach for evaluating the compressive strength of GFRP rebars. However, further analysis is recommended for a more comprehensive understanding of the compressive behavior of these rebars.