A CONSTITUTIVE MODEL FOR HIGH PERFORMANCE PVA FIBER REINFORCED CEMENT COMPOSITES UNDER CONVENTIONAL TRIAXIAL COMPRESSION

The conventional triaxial compression behaviors of HPFRCC are tested through cylindrical specimens with 0%-2% PVA fiber content by the volume under 6 different confining compressions. The ultimate strength, peak strain, ultimate strain and stress-strain curve are obtained. According to test results, the relationships between ultimate strength, peak strain, ultimate strain and confining pressure are proposed. The constitutive equations of HPFRCC under a conventional triaxial compression are deduced according to the complete stress-strain curve obtained from cylindrical specimens. The comparisons show that theoretical results are in good agreement with experimental results. The study provides the basis for the nonlinear finite element analysis of a HPFRCC structure.