Title:
Flexural behavior of High-Strength
Concrete Beams
Author(s):
Keith E. leslie, K. S. Rajagopalan, and Noel J. Everard
Publication:
Journal Proceedings
Volume:
73
Issue:
9
Appears on pages(s):
517-521
Keywords:
beams (supports);deflection;ductility;flexural strength; flexural tests;high-strength concretes;reinforced concrete;reinforcing steels; stress block; stress-strain relationships;structural analysis.
DOI:
10.14359/11093
Date:
9/1/1976
Abstract:
Flexure tests are reported on 12 under-reinforced rectangular beams with f,.’ ranging between 9300 and l 1,800 psi (64 to 81 MN/m”). Serious loss of ductility is evident even when the reinforcement ratio p is less than 0.5Op!,. The currently used rectangular stress block (from the ACI Building Code) does not accurately predict the beam behavior when concrete strengths exceed 8000 psi (55 MN/m’). Pending further test results, the use of a triangular stress block seems prudent.