Title:
Prediction of Pullout Capacity of Channel Anchors
Author(s):
Jeffrey B. Powell, Edwin G. Burdette, and Francis A. Oluokin
Publication:
Structural Journal
Volume:
88
Issue:
5
Appears on pages(s):
624-630
Keywords:
anchors (fasteners); concrete construction; failure; studs; pullout tests; tensile strength; tensile stress; Structural Research
DOI:
10.14359/2799
Date:
9/1/1991
Abstract:
The use of channel anchors in concrete building construction is relatively new. Although the pullout capacity of single stud anchors can be reasonably predicted using the concrete failure cone method, a similar pullout capacity prediction relationship has not been developed for channel anchors with more than one relatively closely spaced embedded anchor. A tensile pullout capacity prediction method was developed, and a relationship is proposed based on a modified concrete failure cone concept. This modified cone method recognizes the intersection of failure cones when anchors are closely spaced, as is typically the case in channel anchors. Predicted pullout capacities of several channel anchors obtained from the proposed relationship were compared to test results from three independent testing agencies. The prediction percentage errors ranged from 17.4 underprediction to 8.8 overprediction for cases where the pullout load was centered on the channel. Over 92 percent of the predicted loads for channel anchors with centered loads have less than 10 percent prediction errors. The total average error for this group of channels is 6.6 percent. This paper contains tables of results and figures supporting the proposed method of evaluating the pullout capacity of channel anchors.