Shear-reinforced concrete breakout design methodology for moment transfer at column-foundation connections

Benjamin L. Worsfold, Jack P. Moehle

Research output: Contribution to journalArticlepeer-review

Abstract

Recent studies have shown that the strength of column-foundation connections carrying moment can be limited by the concrete breakout failure mode. Distributed shear reinforcement in the concrete breakout cone region has been observed to increase the strength and displacement capacity of structural connections governed by breakout. However, the ACI 318–19 building code does not allow designers to consider this strength increase. Rather, the code allows the use of anchor reinforcement provided that the concrete contribution to strength is ignored. This paper proposes a design methodology to calculate the breakout strength considering the additive effect of concrete and reinforcement. Physical test data and finite element simulations from previous studies were used to calibrate the proposed strength equations. Detailing requirements are discussed.

Original languageEnglish (US)
Article number115783
JournalEngineering Structures
Volume283
DOIs
StatePublished - May 15 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Anchor reinforcement
  • Anchoring to concrete
  • Breakout
  • Column-foundation connection
  • Finite element modeling
  • Shear reinforcement
  • Supplementary reinforcement

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