This paper deals with the tensile behaviour and strength of cast-in-place short headed anchor bolts embedded in both normal concrete (NC) and steel fibre reinforced concrete (SFRC). Four volume fractions (vf =0.4%, 0.8%, 1.2%, and 1.6%), two aspect ratios (lf / df =19.63, 36.33), three bolt diameters (db =8, 10, 12mm), and four embedment depths (hef =25, 37.5, 50, 62.5mm) were used. More than (108) specimens were tested under monotonic tensile loading. Only (90) specimens were failed by large concrete failure cone exceeding the dimensions of the specimen and the cone breaks into pieces in most cases (concrete failure), while the other specimens were failed by yielding or fracture of the bolts (steel failure). Tests results showed that breakout capacity ( ) of the anchors were significantly enhanced by the addition of steel fibers to concrete and the size of the failure cone in (SFRC) specimens were smaller than the size of failure cones in (NC).
Key word: Breakout capacity, cast-in-place, failure cone, headed anchor bolt, pullout test, steel fibers.