高性能PVA 纤维增强水泥基复合材料常规三轴受压本构模型

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

摘要: 对PVA 纤维体积率从0%~2%的高性能水泥基复合材料(HPFRCC)圆柱体试件进行了6 种不同围压下的常规三轴受压试验,研究其三轴受压性能,测得了极限抗压强度、峰值应变、极限应变以及应力-应变曲线。根据试验结果得出HPFRCC 的极限抗压强度、峰值应变以及极限应变与侧向围压之间的关系。基于实测圆柱体应力-应变曲线的特点,提出了HPFRCC材料常规三轴受压本构模型。计算结果与试验数据的对比表明,根据该文模型所得的计算曲线与试验曲线吻合较好,研究成果可为HPFRCC结构非线性有限元分析提供依据。

Abstract: 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.