Multiaxial strength and deformations of concrete, failure modes and a new failure criterion

Windisch, Andor (2023) Multiaxial strength and deformations of concrete, failure modes and a new failure criterion. Concrete Structures, 24. pp. 137-148. ISSN 1586-0361

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Abstract

The multiaxial strength of concrete, the associated stress-strain relationships, the failure modes and the failure criteria are again and again in the interest of researchers. After a historical review the most important bi- and triaxial experiments loading through brushes are analyzed. Based on the principal strengths and the loading path-concept a new, transparent type of presentation of the ultimate strength surface (USS) is introduced. For concrete classes ≤ C100 simplified relative strength-increase values are proposed. The difficulties of deformation measurements are reviewed. The outlines of future bi- and triaxial tests are discussed. Two failure modes are appointed. Stress failure criterion of biaxial state of stress are presented. Instead of the Modified Mohr-Coulomb failure criterion Extended Rankine-type failure criteria are proposed. Further systematic tests are necessary to detect the rate of participation of the loading equipment.

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