Flexural behavior of High-Strength Concrete Beams

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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.

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.