Abstract
Fibre reinforced polymer (FRP) bars are rapidly becoming an alternative to conventional steel reinforcing bars in bridge construction. This research investigated the bond behaviour of glass fiber reinforced polymer (GFRP) bars embedded in high-‐performance concrete (HPC). Sand-‐coated and ribbed-‐surface GFRP bars of 16 and 20 mm diameters were considered in this study. Concrete blocks were cast with embedded GFPR bars to conducted pullout tests to examine the effect of varying parameters on their pullout and bond strengths, namely: embedment length, bar diameter, surface treatment, and concrete cover. In addition, bond characteristic were analyzed between straight and head-‐ended sand-‐coated GFRP bars. The experimental results were used to evaluate the development lengths specified in design codes. It was determined that the development lengths for straight GFRP bars provided by the codes are conservative. Also, the development length for head-‐end bar is shorter than that for similar bar with straight end.
Highlights
This chapter outlines the scope of the research conducted and introduces the group of specimens and apparatus that were used to obtain the experimental results
This phenomenon can be described by the studies of Morales Arias et al (2012), where the sand‐coated surface of glass fibre reinforced polymer (GFRP) bars provides a larger surface area of contact for surrounding concrete to bond with when compared to ribbed‐surface
This can be explained by the non‐linear distribution of bond stresses along the GFRP bar within the concrete when the specimen is subjected to tensile force
Summary
This chapter outlines the scope of the research conducted and introduces the group of specimens and apparatus that were used to obtain the experimental results. The parametric study included factors such as surface treatment, bar diameter, embedment length and concrete cover. We present the calculation of the required development lengths based on the experimental study for both sand‐coated and ribbed‐surface GFRP bars. From the experimental test results, bond factors are derived for both straight and headed GFRP bars, which are used to determine the basic required development length. A linear regression analysis is conducted after the calculation of both the bond factor and development length to obtain a single, modified basic development length equation
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