NEHRP Clearinghouse
- Title
- Shear Strength and Deterioration of Short Reinforced Concrete Columns under Cyclic Deformations.
- File
- PB83127845.pdf
- Author(s)
- Umehara, H.; Jirsa, J. O.
- Source
- National Science Foundation, Washington, DC., July 1982, 278 p.
- Identifying Number(s)
- PMFSEL-82-3
- Abstract
- Ten short columns with rectangular cross sections were tested and the results were compared with those of square columns tested previously. Loading history and level of axial load were the main variables. It was concluded that the maximum capacities of columns subjected to diagonal unidirectional loading could be estimated by an interaction line connecting the maximum capacities of each column under unidirectional loading along the principal axis. An empirical equation for the shear strength of the columns was derived using data from continuous beams failing in shear and was calibrated using results of the short column tests. It was found that more than 70 percent of the total shear capacity was contributed by the concrete in the column. Shear criteria were proposed and an evaluation of columns meeting the proposed criteria revealed that strength and energy dissipating capacities were maintained under severe loading conditions.
- Keywords
- Stress strain diagrams; Earthquake resistant structures; Reinforced concrete; Columns (Supports); Mathematical models; Computer applications; Earthquake engineering; Shear strength; Cyclic loads; Deflection; Earthquakes