Dynamic properties of large aggregate concrete under triaxial loading

Abstract

The dynamic properties of large aggregate concrete under the triaxial loading state of tension–compression–compression (T–C–C) are experimentally investigated. The loads of each specimen in three directions are increased monotonically following a fixed load ratio at constant strain rate of 10⁻⁵/s, 10⁻⁴/s, 10⁻³/s or 10⁻²/s. Based on the experimental results, the specimens under triaxial T–C–C are ruptured by one apparent tensile crack perpendicular to the direction of the applied tensile loading. It is revealed that the shapes of the stress–strain curves corresponding to different strain rates are similar to each other at the same stress ratio. The tensile strength and secant modulus under triaxial T–C–C increase with the increase of strain rate, but decrease with the increase of lateral compressive stress. Meanwhile, the tensile critical strain under triaxial T–C–C increases slightly with the increase of strain rate, but increases significantly with the increase of lateral compressive loading. The dynamic failure criterion for large aggregate concrete under triaxial T–C–C in octahedral stress space is proposed.