冲击荷载作用下聚苯乙烯混凝土的吸能特性

ENERGY-ABSORPTION PROPERTY OF EXPANDED POLYSTYRENE CONCRETE UNDER IMPACT

采用φ100mm分离式Hopkinson压杆(split Hopkinson pressure bar,SHPB)试验装置研究了聚苯乙烯(expanded polystyrene,EPS)混凝土在不同应变率下的能量吸收特性。以比能量法作为评价指标,分析了应变率效应以及EPS体积掺量对EPS混凝土吸能特性的影响。探讨了能量吸收特性与试件破坏形态之间的关系。结果表明:EPS混凝土材料的高应变率吸能性能呈现出显著的应变率相关性。随着EPS体积掺量的增加,EPS混凝土的吸能能力先升后降,在EPS体积掺量为20%～30%时出现峰值。

The expanded polystyrene（EPS） concrete at high strain rates was investigated using a 100-mm-diameter split Hopkinson pressure bar（SHPB） apparatus.The infection of volume fractions and the strain rate to energy-absorption capacity were analyzed by specific energy absorption（SEA） index.The relation between the energy-absorption capacity and the failure forms were discussed.The results show that the high-strain-rate energy-absorption capacity of the EPSC materials exhibits a strong strain rate.The energy-absorption capacity of the EPSC increased first and then decreased with increasing the volume fraction of the EPS.The EPSC has the best energy-absorption capacity at the EPS fraction of 20%-30%.