Experimental data are presented for six concrete specimens subjected to displacement reversals. Two specimens were reinforced\r\nlongitudinally with steel bars Grade 410 (60 ksi), two with Grade 670 (97 ksi), and two with Grade 830 (120 ksi). Other\r\nexperimental variables included axial load (0 or 0.2 f \r\nc Ag) and volume fraction of hooked steel fibers (0 or 1.5%). All transverse\r\nreinforcement was Grade 410, and the nominal concrete compressive strength was 41MPa (6 ksi). The loading protocol consisted\r\nof repeated cycles of increasing lateral displacement reversals (up to 5% drift) followed by a monotonic lateral push to failure.\r\nThe test data indicate that replacing conventional Grade-410 longitudinal reinforcement with reduced amounts of Grade-670 or\r\nGrade-830 steel bars did not cause a decrease in usable deformation capacity nor a decrease in flexural strength. The evidence\r\npresented shows that the use of advanced high-strength steel as longitudinal reinforcement in frame members is a viable option\r\nfor earthquake-resistant construction.
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