Evaluation of Minimum Longitudinal Reinforcement Requirements for RC Column







IMPLEMENTATION

This research study was conducted with the intent of reducing the required minimum longitudinal reinforcement ratio for columns subjected to axial load in combination with minimal bending moment. However, although simple concrete creep models suggest that longitudinal reinforcement ratios reduced below the current 1 percent requirement will prevent passive yielding of longitudinal reinforcement, results of the long-term creep tests reported herein do not support this hypothesis. Therefore, the current AASHTO requirement for minimum longitudinal reinforcement in columns should remain at 1 percent of grosssection

area.



ACKNOWLEDGEMENTS

The research study reported herein involved the long-term monitoring of reinforced concrete

columns under sustained axial load. The report is based on portions of theses published at The

University of Texas by Paul H. Ziehl and Jeffrey E. Cloyd. In addition to these coauthors

of the report, the authors are indebted to a

number of other graduate students and undergraduate students

who assisted with fabrication of testing apparatuses and specimens, and

loading of the specimens. The overall project was greatly

enhanced by the technical assistance

provided during the planning stages of the testing program by Mr. David W.

McDonnold (TxDOT Project Director) of the TxDOT Design Division.







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