Title:
The Case for a New Approach to Anchorage in the Code
Author(s):
John Silva
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/25/2020
Abstract:
Anchorage to concrete was introduced in the ACI 318 code in 2002. At that time, it satisfied a need for provisions to address simple anchorage cases (baseplates, etc.) The provisions for reinforcing bar development have a much longer history in the code and were originally intended to address flexural reinforcement bar cutoffs as well as lap splices in slabs, beams, walls and columns. The introduction of headed reinforcing and the use of reinforcing to perform tasks that can be characterized as anchorage has led to confusion in theory and practice. To address this condition, three areas should be addressed in parallel: 1. Application of the fundamental failure modes accounted for in anchorage theory to reinforced concrete details such as beam and slab-column joints, corbels, and column-foundation connections. 2. Implementation of a simple and effective method to account for the effect of proximate reinforcement on concrete failure modes associated with anchorage. 3. Review and harmonization of strength reduction factors associated with anchorage and development. This presentation will chart a path for addressing these topics within the context of the current 318 cycle.