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Title: High-, Medium-, and Low-Strength Concretes Subject to Sustained Overloads-Strains, Strengths, and Failure Mechanisms

Author(s): Mohammad M. Smadi, Floyd 0. Slate, and Arthur H. Nilson

Publication: Journal Proceedings

Volume: 82

Issue: 5

Appears on pages(s): 657-664

Keywords: compressive strength; concretes; cracking (fracturing); creep prop-erties;deformation; failure mechanisms; high-strength concretes; loads (forces);strains; stresses.

DOI: 10.14359/10376

Date: 9/1/1985

The behavior of high-strength concrete subject to high sustained compressive stresses was studied experimentally and compared with that of low- and normal-strength concretes. Various forms of stress-strain time relationships were obtained. The long-term sustained strengths were established for these materials and were found to be preater (as percent off,’ > for high-strength than for low-strength concretes by about .5 to 10 percent. The time-dependent deformations were maximum at the vicinity of the sustained strength and were greater the lower the strength of concrete. A hypothesis on the mechanism of failure under sustained loading is presented which states that a critical stage of cracking is initiated by high sustained loads on attaining a critical strain limit that correlates closely with strain at maximum stress in short-time tests.