Title:
Shear Strength of High-Strength Concrete Beams With Web Reinforcement
Author(s):
John J. Roller and Henry G. Russel
Publication:
Structural Journal
Volume:
87
Issue:
2
Appears on pages(s):
191-198
Keywords:
beams (supports); building codes; compressive strength; high-strength concretes; shear strength; structural design; tests; web reinforcement; Structural Research
DOI:
10.14359/2682
Date:
3/1/1990
Abstract:
An experimental investigation of the shear strength of high-strength concrete beams with web reinforcement was conducted. Two series of beam tests were performed, each series consisting of five beams. All beams were designed in accordance with the provisions of ACI 318-83. Primary design variables were concrete compressive strength and the quantity of shear reinforcement. Concrete with compressive strengths of approximately 10,000, 17,000, and 18,000 psi (69, 117, and 124 MPa) was used in the beam specimens. The quantity of shear reinforcement provided in the beams ranged from the minimum amount required by ACI 318-83 to the maximum amount that can be assumed when calculating shear capacity. Actual shear strength of each beam specimen was compared with the shear strength predicted using the provisions of ACI 318-83. Results of the investigation indicate that for nonprestressed high-strength concrete members subject to shear and flexure, only the minimum quantity of shear reinforcement specified in ACI 318-83 needs to increase as the concrete compressive strength increases. ACI Committee 318 recently approved a proposed provision that expresses the minimum quantity of shear reinforcement as a function of the concrete compressive strength. Results from the tests conducted in this investigation confirm the applicability of the new proposed provision for minimum web reinforcement.