- Author
- Cheok, G. S. | Stone, W. C.
- Title
- Overview of NIST Research on Seismic Performance of Moment Resisting Precast Concrete Beam-Column Joints Containing Post-Tensioning.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Sponsor
- Concrete Research Council, Detroit, MI
- Report
- NISTIR 5257, August 1993, 42 p.
- Distribution
- Available from National Technical Information Service
- Contract
- 92-0A-055
- Keywords
- building technology | post-tensioning | story drift | concretes | connections | beam-columns | precast
- Abstract
- The experimental test program being conducted at the National Institute of Standards and Technology on 1/3-scale model precast concrete beam-to-column connections is summarized. The objective of the test program is to develop guidelines for an economical precast beam-to-column connection for regions of high seismicity. The basic concept of the study is the use post-tensioning for connecting the members. The monolithic test specimens were interior moment resisting connections designed using the Uniform Building Code [ICBO, 1985 and 1988] criteria for seismic Zones 2 and 4 as guidelines. The designs of the precast specimens were based on the monolithic design. To date, seventeen specimens have been tested. Variables in the study include location of the post-tensioning steel, the use of post-tensioning bars versus strands, fully bonded versus partially bonded strands, and the comination of low strength steel and post-tensioning. Specimens were subjected to reversed cyclic loading according to a prescribed displacement history. Comparisons were made between the behavior of the precast specimens and monolithic specimens. The comparisons were based on connection strength, connection ductility, and energy dissipation characteristics.