Stress-Strain Characteristics of High-Strength Concrete


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Title: Stress-Strain Characteristics of High-Strength Concrete

Author(s): P.H. Kaar, N.W. Hanson, and H.T. Capell

Publication: Special Publication

Volume: 55


Appears on pages(s): 161-186

Keywords: beams (supports); flexural strength; high-strength con-cretes; strains; lightweight aggregate concretes; modulus of elasticity; stress block; stresses; stress-strain- relationships; struc-tural analysis

Date: 8/1/1978

The stress-strain relationship and flexural stress distribution for ultimate strength design has been well established from previous work. Generally, normal-weight concretes with strengths ranging from 1,000 psi to 7,500 psi (6.9 MPa t o 51.7 MPa) have been investigated. In the present study, flexural characteristics of high-strength concretes were obtained from a series of specimens tested at the Portland Cement Association laboratories. The test series included concrete strengths ranging from 6,500 psi to 14,850 psi (44.8 MPa to 102.4 MPa) for normal-weight concretes and from 3,560 psi to 12,490 psi (24.5 MPa to 86.1 MPa) for lightweight concretes. Concretes containing three different normal-weight aggregates and two different lightweight aggregates were included in the study. Stress-strain curves, flexural constants, and moduli of elasticity are reported for the complete range of concrete strengths. Results of this investigation have been combined with those of other investigators. The data are compared with the latest ACI Building Code revisions pertaining to flexural constants for strength design.