Development length of glass fibre reinforced polymer (GFRP) rebar based on non-uniform bond stress

Due to the assumption of uniform bond stress, development length fibre reinforced polymer (FRP) bars by design standards can be unnecessarily long and difficult provide in practice. Hence, stress distribution required a glass (GFRP) rebar is investigated. Four beam-bond specimens, two following RILEM specifications based on procedure ACI are tested evaluate effect test method strength. Ten pullout tests also performed using same bar. The methods yield similar results, but easier perform. beams highly nonlinear approaches uniformity. actual found 50% 250% less than that aforementioned standards. Consequently, new equation proposed logistic growth function model non-uniform estimate length.