Title: Evaluation of Expansion Anchor Ultimate Tensile Capacity Prediction Equations
Author(s): R. Walther, C. Sutton, and D. Meinheit
Publication: Symposium Paper
Appears on pages(s): 19-46
Keywords: anchors (fasteners); concretes; expansion; failure mechanisms; performance; strength; tension; Structural Research
Nine equations that predict ultimate tensile capacity for expansion anchor installations failing by formation of a concrete cone are reviewed. The equations predict the tensile capacity for anchors installed in unreinforced, uncracked concrete; group and edge effects are not considered. A data base consisting of the results from 927 tests was used to evaluate the accuracy of the prediction equations. Multiple regression statistics were utilized to ascertain how individual variables affected prediction accuracy. For shallow embedments, all nine equations yield satisfactory or conservative predictions. For deeper embedments, predicted capacity is less conservative. In general, empirical equations developed by curve-fitting experimental data are more accurate than semi-empirical models.