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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
Paper summarizes experimental investigations of the static and dynamic long-term behavior of anchors. Creep behavior and loss of anchor pretension are examined and consequences on the fatigue behavior of anchors subjected to dynamic excitations are shown. Environmental influences, such as moisture or temperature, on the long-term behavior of anchors are also discussed.
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.
Reinforced concrete structures will generally be cracked under service load due to tensile stresses caused by loads or by the restraint of imposed deformations. Therefore, in general, the design of anchors should be based on the assumption that the concrete is cracked. Under tension loading, anchor behavior is significantly influenced by cracks, depending on the type and design of the anchor. If the failure is caused by concrete cone break-out, the failure load is reduced by approximately 30 to 40 percent compared to the value expected in uncracked concrete. If the failure is caused by pullout (expansion or adhesive anchors), the reduction of the failure load may be much higher. Furthermore, installation inaccuracies may have a very significant negative effect on anchor behavior in cracked concrete. Under shear loading, the behavior of all types of anchors away from edges is not significantly influenced by cracks. The failure load of fastenings close to the edge is reduced by cracks by about 30 percent; however, the reduction is almost independent of the type of anchor. A method for the design of fastenings based on rational engineering models and nonlinear fracture mechanics is proposed. It distinguishes between the different loading directions and failure modes and takes into account all relevant influencing factors.
E. Vintzelou and R. Eligehausen.
An experimental program was carried out to investigate the behavior of metallic fasteners (undercut, torque-controlled, expansion, and chemical anchors) embedded in cracked concrete and subjected to shear displacements. The results show that the behavior of all three types of anchors under shear displacements is similar. Fasteners situated close to an edge and loaded towards the edge exhibit brittle concrete failure. Cyclic loadings are possible only for displacements that are much lower than the values corresponding to the monotonic peak load. Fastenings away from an edge will cause steel failure with large displacements. During cyclic loading, a severe force-response degradation was observed. Empirical formulas are proposed to predict the strength of anchors, as well as strength degradation during cyclic loading.
Paper describes design examples prepared by Subcommittee 3 of ACI Committee 349 to demonstrate application of Appendix B of the code to the design of steel embedments. The committee report (Reference 1) is included in the 1990 Manual of Concrete Practice. The paper describes some of the design examples and explains key provisions of the code.
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