Title: Modifying the Concrete Breakout Area with a Bearing Plate to Change Capacity

Author(s): Donald F. Meinheit

Publication: Structural Journal

Volume: 119

Issue: 5

Appears on pages(s): 257-269

Keywords:

DOI: 10.14359/51734668

Date: 9/1/2022

Abstract:

In some instances, cast-in-place anchors need a little extra tension capacity in concrete breakout. One method of increasing capacity is to add a bearing plate at the embedded end of the anchor to increase the base area where the breakout cracking initiates. ACI 318-19 has a procedure for increasing the breakout area in Section 17.6.2.1.3. The American Association of State Highway and Transportation Officials (AASHTO) bridge code also has a procedure to design the bearing plates for post-tensioning anchors. These procedures have the same objective but yield different results. To effectively increase the breakout area, the bearing plate must be stiff enough to uniformly distribute the bearing stress to the concrete. This paper describes the analysis of previously published concrete

This paper describes the analysis of previously published concrete breakout test data and the implications the tests have on determining if the bearing plate is rigid enough to uniformly distribute the bearing stress to the concrete.