Title: High-Strength Flexural Reinforcement in Reinforced Concrete Flexural Members under Monotonic Loading
Author(s): Marnie B. Giduquio, Min-Yuan Cheng, and Leonardus S. B. Wibowo
Publication: Structural Journal
Appears on pages(s): 793-803
Keywords: deformation capacity; flexural strength; high-strength steel
This paper evaluates the performance of reinforced concrete (RC) flexural members reinforced with two different types of highstrength steels—Grade 100 A1035 and SD685—under monotonic loading. Test results indicate that design concepts of the current ACI Building Code can be used to evaluate the strength of specimens reinforced with either type of high-strength flexural reinforcement. With similar design parameters, specimens reinforced with high-strength flexural reinforcement exhibit equivalent ultimate displacement to those with conventional Grade 60 steel. Specimen behavior is greatly influenced by the buckling of compression reinforcement after spalling of cover concrete in the compression zone. The maximum spacing of transverse reinforcement (Grade 60) not exceeding 8db is suggested to restrain either SD685 or A1035 highstrength longitudinal reinforcement against premature buckling in flexural members primarily subjected to gravity-type loading, where db is the diameter of smallest compression reinforcement.