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Item Information   Holdings       More by this author     Blau, Andrew M.     Subjects     Reinforced concrete -- Testing     Reinforcing bars -- Testing     Strains and stresses     Anchorage (Structural engineering)     MSST Project.     Browse Catalog     by author:      Blau, Andrew M.       by title:      Head and bond contri...         MARC Display

Head and bond contributions to anchorage of a headed reinforcing bar / by Andrew M. Blau. by Blau, Andrew M. Subjects Reinforced concrete -- Testing   Reinforcing bars -- Testing   Strains and stresses   Anchorage (Structural engineering)   MSST Project. Description:  94 leaves : ill. ; 29 cm. Contents:  Thesis advisor: Dr. Richard DeVries Committee members: Dr. Douglas Stahl, Christopher Raebel Introduction -- Background -- Previous tests -- Methods -- Data reduction -- Summary of results -- Trends among the specimens -- Analysis -- Conclusion -- A: Zimdahl's specimens. Headed reinforcing bars are becoming more popular in the construction industry; however, there is relatively little known about the interaction of the head and bond in resisting loads. As such, the ACI 318-08 (the 2008 version being the current version) code equation governing headed reinforcing bars appears to be a gross generalization of the capacity of a headed bar. The purpose of this project was to study the contributions of the head and bond as they change with varying bond lengths, clear covers, and head bearing areas to determine if a better model can be developed to represent a headed bar. Twelve headed bar specimens were cast, each one with a unique combination of bone length, clear cover, and head bearing area, and loaded until failure. Two failure modes were observed: bar yielding and side blowout. The loads resisted by the head and bond throughout the loading of each specimen were analyzed for trends. It was determined that headed bars follow one of two patterns: head-dominated and bond-dominated, and is dependent on bond length. As such, different models should be used for the capacity of each pattern. The specimen capacities were compared to models proposed by others, and the current ACI 381-08 code equation. The ACI 318-08 code equation was found to be a good fit with a minor modification for the bond-dominated bars. It was determined to not be possible to develop a model for head-dominated bars from this test program and that additional testing must be conducted. web address:  https://msoe.tind.io/record/987   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .B5958 2010 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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