高温后玄武岩纤维增强混凝土的冲击变形特性
发布时间：2018-09-04 14:46
【摘要】：采用ф100分离式霍普金森压杆系统,研究了不同温度作用后玄武岩纤维增强混凝土(BFRC)的冲击变形特性.结果表明:随着温度及加载速率的升高,BFRC的变形破碎程度增大,应力-应变曲线表现出塑性特征;同一温度下,BFRC的峰值应变和均值应变随平均应变率的增大而增大,具有明显的应变率相关性;同一加载速率下,随着温度的升高,BFRC的峰值应变和均值应变呈上升趋势,峰值应变的应变率敏感性逐渐增强,但在200℃时,BFRC在较低加载速率作用下的均值应变较常温有所减小;掺入玄武岩纤维可以有效提升高温后BFRC的冲击变形能力,且纤维掺量(体积分数)为0.3%时,BFRC的变形优势最大,但当温度与加载速率较低时,BFRC的均值应变较素混凝土小.
[Abstract]:The impact deformation characteristics of basalt fiber reinforced concrete (BFRC) under different temperatures were studied by using a separate Hopkinson pressure bar system. The results show that with the increase of temperature and loading rate, the deformation and fracture degree of BFRC increases, the stress-strain curve shows plastic characteristics, and the peak strain and mean strain of BFRC increase with the increase of average strain rate at the same temperature. Under the same loading rate, the strain rate sensitivity of the peak strain increased with the increase of the temperature and the mean strain. But at 200 鈩，
本文编号：2222471
[Abstract]:The impact deformation characteristics of basalt fiber reinforced concrete (BFRC) under different temperatures were studied by using a separate Hopkinson pressure bar system. The results show that with the increase of temperature and loading rate, the deformation and fracture degree of BFRC increases, the stress-strain curve shows plastic characteristics, and the peak strain and mean strain of BFRC increase with the increase of average strain rate at the same temperature. Under the same loading rate, the strain rate sensitivity of the peak strain increased with the increase of the temperature and the mean strain. But at 200 鈩，
本文编号：2222471
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