In order to investigate the impact dynamic properties of light-weight foam concrete,semiconductor strain test technology and incident pulse shaping technique were adopted to make an aluminium split Hopkinson pressure bar (SHPB) apparatus suitable for low impedance porous materials.Then,the problem being difficult in collecting transmitted signals was solved with the semiconductor strain test technology and the internal stress uniformity requirements in loading process were met with the incident pulse shaping technique.Uniaxial impact compression tests at various striker velocities were conducted by adjusting the pressure of compressed air for light-weight foam concrete with mass density of 220 kg/m3 .The test results showed that under impact loads,the foam concrete specimens go through 3 stages including linear elastic stage,yield stage and pore compaction stage;moreover,there is a stronger linear correlation between the average strain rate of foam concrete specimens and the striker velocity.%为研究轻质泡沫混凝土的冲击动力学性能，结合半导体应变测试技术和入射脉冲整形技术对铝质分离式Hopkinson 压杆（SHPB）装置进行改进，解决了泡沫混凝土类低阻抗多孔介质材料透射信号难采集问题，满足了加载过程中试件内部应力均匀性要求。通过调整冲击气压对密度为220 kg/m3轻质泡沫混凝土实施了不同撞击杆速度下的单轴冲击压缩试验。试验结果表明，泡沫混凝土试件在冲击荷载作用下依次经历线弹性阶段、屈服阶段和孔壁破坏3个阶段，且泡沫混凝土试件平均应变率与撞击杆速度表现出较强的线性相关性。
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