Effect of high-intensity sustained triaxial stresses on the mechanical properties of plain concrete

摘要

An experimental research programme was carried out to investigate the effects of high-intensity prolonged triaxial stresses on the strength and stiffness properties of concrete. The specimens tested were subjected to constant stresses equal to 90 or 95/100 of the failure stress deviator under monotonic loading in different deviatoric planes. The stiffness properties of the specimens were evaluated at different time intervals. The decrease in shear modulus Was taken as a measure of the creep-induced damage. The specimens which did not fail at constant stress within Five days were unloaded and monotonically reloaded to failure.