论文部分内容阅读
为了研究混杂纤维增强聚合物(hybrid fiber reinforced polymer,HFRP)约束超高性能混凝土(ultra-high performance concrete,UHPC)圆柱体的轴压特性,通过36个圆柱体轴压试验,测定了应力-应变全曲线.试验结果表明:已有的几个有代表性的强度和极限应变预测模型并不适用于HFRP管约束UHPC,因此,考虑了纤维混杂种类对约束效率的影响,提出了新的强度与极限应变的公式,其预测精度较高;已有几个代表性的应力-应变本构模型预测曲线比实测曲线偏低,提出了双线性的本构模型,理论曲线和试验曲线吻合良好,模型表达式简单,便于设计人员使用.
In order to study the axial compressive properties of UHPC cylinders with hybrid fiber reinforced polymers (UHRP), 36 cylinder axial compression tests were carried out to determine the stress-strain Full curves.The experimental results show that the existing models of strength and ultimate strain prediction are not suitable for HFPC-constrained UHPC, therefore, considering the influence of the kinds of fiber confinement on the restraint efficiency, the new strength and The formula of ultimate strain is higher than that of the measured curve. The bilinear constitutive model is proposed for several representative stress-strain constitutive model prediction curves. The theoretical curve and the experimental curve are in good agreement with each other, Model expression is simple, easy for designers to use.