Design of Anchor Reinforcement in Concrete Pedestals



Design of Anchor Reinforcement in Concrete Pedestals Widianto, Chandu Patel, and Jerry Owen

Widianto is a structural engineer on the Shell SUEx 1 project. He received his B.S, M.S.E., and Ph.D. from the University of Texas at Austin. He is a member of the ASCE Task Committee on Anchor Rod Design, and an associate member of the Joint ACIASCE Committee 445 (Shear and Torsion), ACI Committees 351 (Foundations for Equipment and Machinery) and 440 (Fiber Reinforced Polymer Reinforcement).

Chandu Patel earned his Bachelors of Science in Civil Engineering from Gujarat University, Ahmedabad, India and Masters in Structural Engineering from Oklahoma State University. He has been with Bechtel since 1981. He has over 30 years of experience, primarily on Petroleum and Chemical projects and Pre-engineered Buildings. He is a member of the ASCE Task Committee on Anchor Rod Design. Presently, Chandu is the ISBL Lead on the Angola LNG

project. Jerry Owen earned his Bachelors of Science in Civil Engineering from Mississippi State University and has been with Bechtel since 1981. He has over 30 years of experience, primarily on Petroleum and Chemical projects. He is a member of the ASCE Task Committee on Anchor Rod Design. Presently, Jerry is the Engineering Group Supervisor

for the CSA team on the Shell SUEx 1 project. 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.



KEYWORDS:

Anchor,

Anchorage,

Anchor

reinforcement,

Strut-and-Tie

Model


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