Shear Strength of Hairpin Reinforced Cast-In-Place Anchors by Static and Seismic Qualification Tests

Abstract

-This study evaluated the static and dynamic shear strength of cast-in-place anchors reinforced with hairpin bars in uncracked and cracked concrete. The anchors 30mm in diameter reinforced with D10 hairpin bar were designed with an edge distance of 150mm and an embedment depth of 240mm. The cracked specimens consisted of the orthogonal and parallel cracks to the direction of shear loads, respectively. The dynamic strength was evaluated using seismic qualification tests based on the ACI 355.2 standard. The shear strength of the hairpin reinforced anchor was hardly correlated to the concrete cracks and the dynamic strength was similar to its static shear strength. Finally, a consideration on the design strength of hairpin reinforced anchors was presented. Keywords -Hairpin-reinforced, Cast-in-place anchor, Shear strength, Seismic qualification test, Uncracked and cracked concrete 에서 인장