Anchorage Behavior of Headed Reinforcement
Part A: Lap Splices
Part B: Design Provisions and Summary

M. K. Thompson, A. L. Ledesma, J. O. Jirsa, J. E. Breen, and R. E. Klingner


The behavior of headed reinforcement in concrete was studied using full-scale tests of lap splices. The mechanics of the anchorage behavior were observed and recorded to evaluate the manner in which the capacity of a headed bar is developed. The measured data were compared to the results of a companion study of headed reinforcement anchored in CCT nodes. Observations from the lap splice tests provided information on the mechanism of stress transfer between lapped bars. The results indicate that strut-and-tie modeling can be successfully applied to understand the behavior of non-contact lap splices and is necessary in determining the anchorage length of lapped bars. Observations of headed bar anchorage have shown that the final anchorage capacity consists of peak head bearing and reduced bond. A model for anchorage capacity was produced based on this concept. Finally, recommendations for structural concrete design using headed reinforcement were made.

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