Title:
Breakout Capacity of Anchors in Concrete—Part 2: Shear
Author(s):
Hakki Muratli, Richard E. Klingner, and Herman L. Graves III
Publication:
Structural Journal
Volume:
101
Issue:
6
Appears on pages(s):
821-829
Keywords:
anchorage; concrete; shear
DOI:
10.14359/13457
Date:
11/1/2004
Abstract:
The overall objective of this paper is to evaluate three different procedures for predicting the concrete breakout capacity in shear of anchors under static and dynamic loading, and in uncracked and cracked concrete. A data base for shear anchors was developed, evaluated, and placed in the public domain. Observed capacities of shear anchors failing by concrete breakout were compared with the predictions of three methods: the 45-degree cone method; the concrete capacity (CC) method, and a variation of the CC method obtained by regression analysis. Each predictive method was then evaluated using Monte Carlo analyses to predict the probability of failure by concrete breakout using the design framework of ACI 349-90, Appendix B, “Steel Embedments.” That framework was used because it was the reference of the U.S. Nuclear Regulatory Commission (U.S. NRC) at the time the research was conducted. Those methods were used because they were latest available in 1997 and 1998, when this research was conducted. Based on the results of this evaluation and on other information, procedures are proposed for designing such anchors. Many of those procedures have been adopted into current design provisions (ACI 318-02 and ACI 349-01); the recommendations are still pertinent to those current provisions.