Mechanical properties of reactive powder concrete-filled steel tube after exposure to high temperature under impact loading
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摘要: 采用霍普金森压杆装置对高温后钢管活性粉末混凝土(reactive powder concrete-filled steel tube，RPC-FST)进行冲击压缩实验，分析了应变率效应及温度效应对试件动态力学性能的影响。结果表明：高温(200、300 ℃)后RPC-FST仍具有较好的抗冲击能力、延性和完整性；冲击荷载作用下，RPC-FST的应变率效应明显弱于RPC的应变率效应；随着过火温度的提高，RPC-FST的峰值应力逐渐增大，变形能力增强，抗冲击能力提高。动力提高系数随过火温度的提高而增大，说明高温后RPC-FST的应变率效应更显著。Abstract: Experiments on reactive powder concrete-filled steel tube (RPC-FST) specimens after exposure to high temperature were performed by using a split Hopkinson pressure bar (SHPB) apparatus, and the influences of strain rate effects and temperature effects on the dynamic behaviors of RPC-FST were investigated. Test results show that the RPC-FST specimens after exposure to high temperature have excellent impact-resistance, ductility and integrity. The strain rate effects of the RPC-FST specimens are weaker than those of the RPC specimens under impact loading. The peak stress of the RPC-FST specimens increases as the temperature increases, and the deformation capability and impact-resistance increase. The dynamic increase factor (DIF) increases as the temperature increases. It means that the strain rate effects of RPC-FST become more obvious after exposure to high temperature.
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图 13 不同温度后动力增大系数与应变率的关系
Figure 13. Variations of dynamic increase factors versus strain rates
表 1 RPC-FST冲击实验结果
Table 1. Experimental results of RPC-FST specimens under impact loading
编号 θmax/℃ p0/MPa v0/(m·s-1) σp/MPa σp/MPa ${\mathit{\bar{\dot{\varepsilon }}}}$/s-1 λdi s0b 20 0.8 12.1 218~227 223 95 1.31 s0c 20 1.0 14.3 242~250 247 122 1.45 s1b 200 0.8 12.3 235~240 237 100 1.56 s1c 200 1.0 14.0 249~255 252 122 1.66 s2b 300 0.8 12.2 245~250 247 100 1.64 s2c 300 1.0 14.1 265~272 268 121 1.77 
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表 2 RPC冲击实验结果
Table 2. Experimental results of RPC specimens under impact loading
编号 θmax/℃ p0/MPa v0/(m·s-1) σp/MPa σp/MPa ${\mathit{\bar{\dot{\varepsilon }}}}$/s-1 λdi s0b 20 0.8 12.0 192~200 195 107 1.63 s0c 20 1.0 14.1 211~220 215 116 1.79 s1b 200 0.8 12.1 204~207 206 100 2.17 s1c 200 1.0 14.2 219~224 221 125 2.33 s2b 300 0.8 12.0 205~214 209 90 2.22 s2c 300 1.0 14.2 231~241 237 120 2.52
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表 3 动力提高系数的理论值与实验值的对比
Table 3. Comparisons of experimental and analytical dynamic increase factors
编号 θmax/℃ p0/MPa 平均应变率/s-1 动力提高系数 实验值 理论值 相对误差/% s0b 20 0.8 95 1.31 1.30 -0.9 s0c 20 1.0 122 1.45 1.36 -6.1 s1b 200 0.8 100 1.56 1.74 11.4 s1c 200 1.0 120 1.66 1.80 8.3 s2b 300 0.8 100 1.64 1.75 6.9 s2c 300 1.0 121 1.77 1.81 1.9
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