Civil Engineering Association

Design of Anchor Reinforcement in Concrete Pedestals According Appendix D of the ACI 318-05

ABSTRACT
Even though the Appendix D of the ACI 318-05 permits the use of supplementary
reinforcement to restrain concrete breakout, it does not provide specific guidelines in
designing such reinforcement. This paper presents a method for designing anchor
reinforcement in concrete pedestals, where un-reinforced concrete is insufficient to resist
anchor forces. Anchor reinforcement consists of longitudinal rebar and ties to carry
anchor tension forces and shear forces, respectively. The Strut-and-Tie Model is
proposed to analyze shear force transfer from anchors to pedestal and to design the
required amount of shear reinforcement. A proposed design procedure is illustrated in an
example problem

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Design of Anchor Reinforcement in Concrete Pedestals According Appendix D of the ACI 318-05
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