Title: Reinforcement Limits for Reinforced Concrete Elements with High-Strength Steel
Author(s): Aishwarya Y. Puranam and Santiago Pujol
Publication: Structural Journal
Appears on pages(s): 201-212
Keywords: beams; high-strength steel; maximum reinforcement; minimum reinforcement; reinforced concrete; slabs, walls
Building codes control the minimum and maximum amounts of longitudinal reinforcement in reinforced concrete (RC) elements to avoid brittle failure. A two-phase experimental investigation was conducted to reexamine the existing limits to allow the use of high strength steel reinforcement (HSSR) with fy > 80 ksi (550 MPa). The test results suggested that it is feasible to use HSSR (with fy up to 120 ksi [830 MPa]). Careful projection of existing limits to HSSR produced elements with similar toughness as those with conventional reinforcement (Grade 60, fy = 60 ksi [415 MPa]). The results presented also supported code provisions to allow the use of HSSR introduced in ACI 318-19.