EXPERIMENTAL STUDY ON THE MECHANICAL BEHAVIOR OF HIGH STRENGTH AND HIGH PERFORMANCE CONCRETE UNDER TRIAXIAL COMPRESSIVE-TENSILE LOADING

An experimental investigation was conducted to characterize the responses of high strength and high performance concrete (HS-HPC) subjected to triaxial compressive-tensile stresses with servo-hydraulic actuators at different stress ratios. The uniaxial compressive strength of HS-HPC is 90.6 MPa. The principal stresses and strains of the specimens were recorded, and the failure of the specimens under various stress states were examined. The experimental results indicate that the typical failure mode of the specimens is tensile failure. The ultimate stress in maximum principal stress direction is much lower than uniaxial compressive strength, and the intermediate principal stress effect is not obvious at different stress ratios. The presence of tensile stress has significant influence on the stress-strain curve in maximum principal stress direction, which shows obvious linear characteristics compared with uniaxial compressive stress state. Failure criteria are proposed for the HS-HPC specimens under triaxial compressive-tensile loading. The test results provide a valuable reference for obtaining multi-axial constitutive law for HS-HPC.