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采用霍普金森压杆(Split Hopkinson pressure bar,SHPB)试验装置和高温炉进行了高温下普通混凝土的抗冲击性能试验研究,通过比较实测动态强度和应力-应变曲线,揭示了温度和应变率对高温下混凝土动态力学性能的影响规律。试验结果表明:除200℃~300℃范围外,高温下混凝土具有显著的应变率效应,且温度越高动态应变率效应越显著;温度和应变率对混凝土归一化应力-应变关系曲线上升段的形状影响很小,可采用统一的函数形式。200℃~300℃低温区混凝土不仅无明显动态效应,且存在静力强度衰减现象,此特性需引起注意并有待进一步研究。
The impact properties of ordinary concrete under high temperature were studied by using the Hopkinson pressure bar (SHPB) test device and the high temperature furnace. By comparing the measured dynamic strength and the stress-strain curve, the influence of temperature and strain rate Influence laws of dynamic mechanical properties of concrete under high temperature. The experimental results show that except for the temperature range of 200 ℃ ~ 300 ℃, the concrete has a significant strain rate effect at high temperature, and the higher the temperature, the more obvious the dynamic strain rate effect. The effect of temperature and strain rate on the normalized stress- The shape of the impact is small, can be a unified function form. The concrete with low temperature of 200 ℃ ~ 300 ℃ has not obvious dynamic effect, and there is the static strength decay phenomenon. This property needs attention and needs further study.