钢-聚丙烯混杂纤维混凝土动力学性能的SHPB试验

摘要

In order to research theinfluenceon concrete static compressive strength about fiber types,combination methods,and fiber contents.Using SHPB experiment in different pressure to threeHFRC (AS-CSHFRC,AS-PHFRC,CS-PHFRC).Comparing with the plain concrete,theHFR-Chave significant strain rate enhancement affection.Polypropylene fiber could improve the concrete brittle damage and AS-PHFRC and CS-PHFRC are better than AS-CSHFRC in damaging shape.AS-CSHFRC is the best in dynamic compression deformation capacity in three different HFRC,and the peak strains have little fluctuation with different fiber content.%为研究不同纤维类型、组合方式和掺量对混凝土静态抗压强度的影响,通过分离式SHPB实验装置对3种HFRC (AS-CSHFRC、AS-PHFRC、CS-PHFRC)进行不同气压下的动态力学性能实验.试验结果表明:与素混凝土相比3种HFRC材料的破坏形态在动态荷载作用下均表现出了明显的应变率增强效应,其中聚丙烯纤维可以改善混凝土的脆性破坏,AS-PHFRC和CS-PHFRC在破坏形态上优于AS-CSHFRC.对比3种HFRC混凝土,AS-CSHFRC的动态压缩变形能力最好,且峰值应变随纤维掺量的变化无较大的波动.