Novel testing and characterization of GFRP bars in compression

The results showed that the increase in bar diameter increases the micro-fibre buckling and decreases the compressive-to-tensile strength ratio

O.S. AlAjarmeh; A.C. Manalo; B. Benmokrane; P.V. Vijay; W. Ferdous; P. Mendis

2019

Scholarcy highlights

  • Glass Fibre Reinforced Polymer bars have been an effective alternative replacement to steel bars as internal reinforcement for concrete structures exposed to harsh environments due to their high strength and non-corrosive properties
  • This study comprehensively investigates the compressive behaviour of high modulus GFRP bars using a novel test procedure
  • EVALUATION OF COMPRESSIVE PROPERTIES OF GFRP BARS Crushing Strength of GFRP Bars The crushing strength ffc of the GFRP bars was determined from the bars tested with Lu⁄db ratio of 8 or less
  • A correlation factor is determined from the equation of the power line that best describes the relationship between the reduction factor, α and the cross sectional area curve
  • This factor accounts for the difference in the ratio of the compressive strength to that of the tensile strength by considering the nominal area of the GFRP bars bars as proposed in Eq
  • The compressive modulus of elasticity reported in Table 5 is almost similar to the tensile modulus of elasticity Efu for #5 and #6 GFRP bars but 12% higher for #3 bars
  • Theoretical models have been proposed to predict the compressive strength of GFRP bars at different Lu⁄db ratios
  • Except for bars with Lu⁄db ratio of 2, there was no observed premature failure in tested bars due to high stress concentration at the top and bottom portion of the bars

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