Study on the reduction of concrete compressive strength due to triaxial compressive loading history

Based on the continuum damage mechanics theory, the damage of concrete cubes experienced monotonic and cyclic triaxial compressive load is studied experimentally. The loading history is denoted by the combination of lateral stress and maximum longitudinal strain, the damage of the concrete is denoted by the reduction of compressive strength. By curve fitting of the experimental data, the evolution equation of damage is obtained. The main factors that affect the damage development are examined and the causes are expounded. It is demonstrated that the method is convenient and applicable to estimate the damage of concrete in engineering practice.