Reinforcement Limits for Reinforced Concrete Elements with High-Strength Steel

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Title: Reinforcement Limits for Reinforced Concrete Elements with High-Strength Steel

Author(s): Aishwarya Y. Puranam and Santiago Pujol

Publication: Structural Journal

Volume: 116

Issue: 5

Appears on pages(s): 201-212

Keywords: beams; high-strength steel; maximum reinforcement; minimum reinforcement; reinforced concrete; slabs, walls

Date: 9/1/2019

Abstract:
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.