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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 12 Abstracts search results
January 1, 1992
T. Balough, G. Kovacshazy and A. Frigey
Sixty-six pullout tests were conducted on cast-in-place concrete anchors consisting of a threaded rod with a washer and two nuts, nonsymmetrical deformed anchors, and formed anchor heads. The purpose of the test program was to compare the behavior of these three anchors and to check the reliability of the ACI 349-85 standard calculation method. All the anchors were cast in 300 x 300 x 150 mm unreinforced concrete blocks. The test variables were concrete strength, embedment depth and edge distance. The test results showed that if the failure mode is a concrete shear cone failure, the values calculated using the ACI 349-85 standard calculation method, without a strength reduction factor, will provide a good prediction. If splitting or pullout failure occurs, the pullout force will be 25 percent lower. The effect of anchorage depth is overestimated by the ACI 349-85 standard model. A strength reduction factor = 0.50 is proposed to achieve a 95 percent probability that failure loads for steel embedment will exceed the ACI 349-85 theoretical value. Formed anchor heads are recommended as a standard.
Design information for concrete anchors is summarized in this paper. Based on recent research, the tension and shear capacities published in the past for concrete anchors are generally unconservative, especially data for proprietary concrete anchors. This paper recommends new design parameters for seven categories of concrete anchors. The parameters, presented in tabular form, are related to tension zone cracking and seismic loading, as well as spacing and edge distance.
R. Cook and R. Klingner
A comprehensive research program has been conducted, dealing with ductile, multiple-anchor, steel-to-concrete connections. Based on the results of the program, behavioral models have been formulated for such connections, and design guidelines have been developed. In this paper, the program is summarized, and the principal results are reviewed.
R. Walther, C. Sutton, and D. Meinheit
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.
Ninety-day load-relaxation tests at room temperature were conducted on a full range of sizes of heavy duty sleeve and lead caulking expansion anchors. The test results showed that the sleeve and lead caulking anchors on the average are able to retain only 60 and 40 percent of their initial tension load, respectively.
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