Behavior of High-Strength Concrete Under Uniaxial and Biaxial Compression


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Title: Behavior of High-Strength Concrete Under Uniaxial and Biaxial Compression

Author(s): Robert C. Chen, Ramon L. Carrasquillo, and David W. Fowler

Publication: Special Publication

Volume: 87


Appears on pages(s): 251-274

Keywords: compression tests; failure mechanisms; high-strength concretes; models; strength; stress-strain relationships; tensile stress.

Date: 9/1/1985

Experimental investigations on the behavior of high strength concrete under uniaxial and biaxial short-term compressive stresses were conducted using thin square plate specimens. Strength, stress-strain relationship, mode of failure, and failure mechanism are discussed. Results confirm that a main cause of the increase in strength, stiffness, and proportional limit of concrete under biaxial compression is the confinement of internal microcracking preventing the development of a progressive failure mechanism. In addition, it was found that as the aggregate stiffness approaches that of the mortar, both the proportional limit and the discontinuity point of the concrete increase due to the reduction of stress concentrations. The observed failure mode for high strength concrete can be explained in terms of the limiting tensile strain criterion.