Title: Shear In SFRC Slabs Reinforced With High Strength Steel

Author(s): Laura N. Talboys and Adam S. Lubell

Publication: Structural Journal

Volume: 111

Issue: 6

Appears on pages(s): 1431-1440

Keywords: high-strength steel reinforcement; serviceability; shear; steel fiber-reinforced concrete

DOI: 10.14359/51687103

Date: 11/1/2014

Abstract:
The combined use of steel fiber-reinforced concrete (SFRC) and high-performance deformed steel reinforcing bars in structural members offers the potential for enhanced strength and durability with extended service life compared to traditional construction materials. While the structural performance of members containing each of these materials has been considered individually in the past, there is limited research available to establish the shear design requirements for members containing both. This study examined the behavior of six large-scale shear-critical specimens with overall heights up to 1000 mm (39.4 in.). Specimens contained 1.0% volume fraction of hooked-end steel fibers and ASTM A1035 longitudinal steel reinforcement. The test results showed that the shear stress at failure decreased as the member depth increased and as the strain in the longitudinal reinforcement increased. These trends were similar to those established for plain concrete members, but in all cases the use of discrete fibers resulted in a significant increase in shear capacity relative to existing shear models for reinforced plain concrete slabs. An approach to increase the design shear strength of SFRC members relative to plain concrete members with similar reinforcement is presented.