Fatigue Strength of High-Yield Reinforcing Bars.

摘要

This report describes and documents a study of the fatigue strength of high yield reinforcing bars (generally Grades 60and 75). A statistically valid experiment was performed employing 353fatigue tests on concrete beams,each containing one reinforcement bar. Test results were entered in an over-all multiple linear regression analysis. The major effects studied were stress range,minimum stress,bar diameter,type of specimen,grade of bar,and bar geometry. On the basis of the observed behavior, a fatigue design provision was developed for deformed reinforcing bars,suggesting a limitation on the service load stress range.