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芳纶纤维复合材料包裹混凝土短柱轴心动态抗压强度研究
doi: 10.13204/j.gyjz201506003
RESEARCH ON THE DYNAMIC COMPRESSIVE STRENGTH OF A AFRP-WRAPPED CONCRETE COLUMN
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摘要: 采用空军工程大学的100分离式霍普金森压杆(SHPB)装置,对芳纶纤维材料(AFRP)包裹混凝土短柱在高应变率条件下的抗压强度进行了试验研究。研究结果表明:在高应变率下,采用AFRP加固混凝土短柱,动态抗压强度得到了显著提高,并随应变率上升而增长;相同应变率水平下,动态抗压强度随AFRP加固层数的增加呈现出先增大后减小的特性,其中两层AFRP包裹混凝土短柱增强性能最优。另外,考虑应变率效应,对Bethet强度模型进行修正,得到了适用于高应变率条件下的AFRP包裹混凝土短柱强度模型。
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关键词:
- 芳纶纤维增强材料( AFRP) /
- 分离式霍普金森压杆 /
- 动态抗压强度 /
- 应变率效应 /
- 强度模型
Abstract: The compressive strength of AFRP-wrapped concrete column under high strain rate was experimentally studied utilizing an 100 mm diameter SHPB apparatus． The results indicate that the compressive strength was enhanced under high strain rate and presented clear strain rate dependence; when the strain rate was kept similar，the dynamic compressive strength first increased and then decreased，in which 2-ply AFRP-wrapped concrete exhibited the best enhancement property． Besides，a new ultimate strength model was obtained by modifying the Bethet strength model considering strain rate effect． -
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