钢纤维混凝土动态抗拉强度的实验研究

基于线弹性和一维应力波假定，采用Φ75mmSHPB对钢纤维体积率Vf分别为0、0.75%和1.50%的三种混凝土材料进行了一维杆层裂实验，考虑了应力波在混凝土材料内传播时的波形弥散效应和应力幅值衰减，通过计算应变片记录的应力信号确定了材料的动态抗拉强度。结果表明，钢纤维混凝土的动态抗拉强度受应变率和钢纤维体积率的影响，本文为测试脆性材料的动态抗拉强度提供了一种有效方法。基于微观扫描技术，对钢纤维增强机理进行了分析。

Dyanmic tensile strength tests for steel fiber reinforced concrete

Based on the assumptions of linear elastic and one-dimension stress wave, spalling experimental study of steel fiber reinforced concrete bar with fiber volume ratio of 0, 0.75% and 1.50%, respectively, is carried on by using Φ75mmSHPB, and the dynamic tensile strength is obtained by calculating the stress signal recorded by the strain gauge pasted on the specimen considering the shape dispersion and attenuation of stress waves traveling through concrete material. The results show that the dynamic tensile strength is affected by the strain rate and the fiber volume ratio. This paper presents an effective method for testing the dynamic tensile strength of brittle material. The reinforced mechanism of steel fiber is analyzed based on the micro scanning technique.