对C30、C40、C50三种强度等级的素混凝土及1~4层玄武岩纤维(BFRP)包裹试件进行了SHPB冲击试验，分析了试件在冲击作用下的破坏现象，研究了应变率和约束比对应力应变曲线的影响，得到了BFRP约束混凝土的动态强度拟合公式。试验结果表明：BFRP包裹试件的抗打击能力和变形能力较未包裹试件有较大提高，具有良好的吸能能力；随着包裹层数的增加和应变率提高，试件抗冲击强度和变形能力提高明显，应力应变曲线下降段的下降速度开始变缓，说明纤维在试件中所起的作用增强。
Abstract
SHPB impact experiment has been made on plain concrete specimen and specimen confined with different amount of BFRP layers. The plain concrete specimen was made of C30, C40 and C50 cement. The damage phenomena of specimen was analysed, the influence of strain rate and confinement ratio to the stress-strain curve was also researched. The Dynamic strength fitting formula of the BFRP confined specimen was achieved. The test results show that the BFRP confined specimen have better anti-strike capability, energy absorption capability and deformability compared with those without BFRP confinement. The impact strength and deformability of specimen increase significantly with the increase of strain rate and the amount of BFRP layers, and the slope of the stress-strain curve decline section becomes smaller, which indicate that BFRP plays a greater role in concrete specimen.
关键词
玄武岩纤维包裹混凝土 /
分离式霍普金森压杆 /
约束比 /
应变率效应 /
动态强度
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Key words
BFRP confined concrete /
SHPB /
confinement ratio /
strain rate effect /
dynamic strength
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