In this study, a series of the dog-bone specimens were prepared to investigate the effects of the steel fiber types, fiber volume fractions and water/cement ratios on the tensile properties of steel fiber reinforced mortar (FRM) exposed to elevated temperatures by the uniaxial tensile test. The main properties of the FRM were examined, including the tensile strength, peak strain, elastic modulus and Poisson’s ratio. The results indicated that the tensile strength, elastic modulus and Poisson’s ratio of FRM gradually decreased with increasing exposed temperature, while the peak strain gradually increased. At room temperature, the tensile strength of mortar with the straight fiber (QP), hooked-end fiber (QW) and corrugated fiber (QB) were greater than that without steel fiber, and the effects of the hooked-end and corrugated fibers on the tensile behavior of FRM were more significant than that of the straight fiber, especially at the higher temperatures. Finally, the prediction formulas for the tensile strength and elastic modulus of FRM exposed to elevated temperatures were proposed by fitting the experimental data.

在这项研究中，准备了一系列狗骨试样，以研究钢纤维类型、纤维体积分数和水灰比对钢纤维增强砂浆 (FRM) 在高温下拉伸性能的影响。单轴拉伸试验。研究了 FRM 的主要特性，包括拉伸强度、峰值应变、弹性模量和泊松比。结果表明，随着暴露温度的升高，FRM的拉伸强度、弹性模量和泊松比逐渐降低，而峰值应变逐渐增大。常温下，加入直纤维（QP）、钩端纤维（QW）和波纹纤维（QB）的砂浆抗拉强度大于无钢纤维的砂浆，钩端和波纹纤维对FRM拉伸行为的影响比直纤维更显着，尤其是在较高温度下。最后，通过拟合实验数据，提出了高温下FRM拉伸强度和弹性模量的预测公式。