Headed Reinforcement in Disturbed Strain Regions of Concrete Members

TitleHeaded Reinforcement in Disturbed Strain Regions of Concrete Members
Author(s)Dale E. Berner and George C. Hoff
PublicationConcrete International
DateJanuary 1, 1994


Disturbed strain regions are areas within a concrete member where plane sections do not remain plane after the member is deformed. Disturbed strain regions occur in portions of all reinforced concrete members. Typically, the disturbed regions are at the boundary regions, concentrated loading points, geometric discontinuities, and in members with relatively small span-to-depth ratios such as deep beams. Recently, more rational procedures have been developed for design of the disturbed regions of reinforced concrete, including strut-tie and compressive field procedures. Such design procedures combined with recent test results have indicated that the traditional design rules and guidelines are frequently unnecessarily conservative. This is particularly so where efficient reinforcing details are adopted such as the headed reinforcement discussed in this article.