Basis for design of screw anchors in concrete

Jacob Olsen, Thilo Pregartner, Anthony J. Lamanna

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Concrete screw anchors are gaining greater acceptance in building practice because they are reliable fastening elements with high capacities that can be easily installed. The current practice for designing concrete screw anchors is the concrete capacity design (CCD) method with a modified effective embedment depth determined by the geometry of the screw. This empirical model was originally based on testing conducted in Europe on several types of metric screw anchors. The load-bearing behavior of concrete screws in concrete is explained in this study. The existing database of tension tests on metric screw anchors has been increased to include a large number of tests on inch-sized screw anchors in cracked and uncracked concrete and is evaluated with the current design model. It is shown that the current empirical design model, although somewhat conservative, continues to be the best choice as an efficient method for designing screw anchors.

Original languageEnglish (US)
Pages (from-to)559-568
Number of pages10
JournalACI Structural Journal
Volume109
Issue number4
StatePublished - Jul 2012
Externally publishedYes

Keywords

  • Concrete capacity design method
  • Concrete screw anchor
  • Post-installed anchors

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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