Enhanced Insights on High-Strength Reinforcing Bars

Acceptable Elongations and Low-Cycle Fatigue Performance

The Charles Pankow Foundation is pleased to make available for download the FINAL REPORT associated with Research Grant Agreement #03-16, Acceptable Elongations and Low-Cycle Fatigue Performance for High-Strength Reinforcing Bars.

This research is part of a larger national effort aimed at quantifying changes in the seismic collapse risk of concrete structures associated with switching from conventional grade 60 reinforcing bars to high-strength reinforcing bars. This research provides the necessary experimental data and behavioral models to identify when longitudinal bars in seismically detailed frame members reach fracture during seismic events across all types of bars and grades in production or under development in the United States. Reinforcing bars tested include Grades 60, 80 and 100.

This research team led by Principal Investigator Wassim M. Ghannoum, Ph.D., P.E., F.SEI, University of Texas - San Antonio included Drit Sokoli, Graham Hogsett, Albert A. Limantono, Ariel Suselo, Dhiaa Al-Tarafany and Sarah Rodgers. Industry advisers include Mike Mota, CRSI; Dominic Kelly, SGH; Andrew Taylor, KPFF; Conrad Paulson, WJE; and Loring Wyllie, Degenkolb.

This research was made possible with co-funding support from the ACI Foundation and the Concrete Reinforcing Steel Institute, and material donated by Cascade Steel, CMC, Gerdau, MMFX and NUCOR Steel Inc.

Click here for a free download of this report