Li Ping, Feng Jie, Gu Jiming, Duan Shiwei
School of Mechanical Engineering, Anhui University of Technology, Maanshan 243032, China.
Materials (Basel). 2024 Jul 11;17(14):3440. doi: 10.3390/ma17143440.
The associated effects of temperature and steel fiber content on the energy absorption properties of concrete were examined using quasi-static uniaxial compression tests of concrete materials with varied steel fiber contents (0%, 0.5%, 1%, and 1.5%) at various temperatures (20 °C, 200 °C, 400 °C, and 520 °C). The experimental findings demonstrate that steel fibers can greatly boost concrete's ability to absorb energy and that the toughness index rises with steel fiber concentration. The energy absorption capacity of concrete under high-temperature conditions also significantly decreases as temperature rises, and the energy absorption ability of steel fiber concrete under the same temperature is superior to that of plain concrete. The coupled influence factor K of temperature-steel fiber percentage characterizing the energy-absorbing ability of concrete was determined, and the coupled influence law of temperature and steel fiber content on the energy-absorbing capacity of concrete materials was summarized and analyzed on the basis of the experimental data of high-temperature compression. Equivalent equations for steel fiber reinforcing and temperature weakening effects when they are comparable (K = 1) are developed and equivalent parameters for concrete materials are given.
通过对不同钢纤维含量（0%、0.5%、1%和1.5%）的混凝土材料在不同温度（20℃、200℃、400℃和520℃）下进行准静态单轴压缩试验，研究了温度和钢纤维含量对混凝土能量吸收特性的相关影响。试验结果表明，钢纤维能显著提高混凝土的能量吸收能力，且韧性指数随钢纤维含量的增加而提高。高温条件下混凝土的能量吸收能力也随温度升高而显著降低，相同温度下钢纤维混凝土的能量吸收能力优于素混凝土。确定了表征混凝土能量吸收能力的温度 - 钢纤维含量耦合影响系数K，并基于高温压缩试验数据总结分析了温度和钢纤维含量对混凝土材料能量吸收能力的耦合影响规律。建立了钢纤维增强效应与温度弱化效应相当（K = 1）时的等效方程，并给出了混凝土材料的等效参数。
