碳纤维包裹下混凝土的动态力学性能研究

Study on Dynamic Mechanical Properties of CFRP Wrapped Concrete

为研究在强动载冲击下、径向碳纤维布约束条件下的混凝土动态力学性能,采用SHPB(分离式霍普金森杆)技术对C40混凝土试件及碳纤维布包裹的C40混凝土试件进行累计冲击压缩试验,测试出试件在不同冲击加载条件下的平均应变率、破坏应力、破坏应变等。同时采用表面直透法对试件进行损伤检测,并用多次冲击有效试验来讨论累计损伤特性。通过对两者特性对比分析,得出混凝土在碳纤维包裹下延性和强度均得到提高,且延性增加的更为明显,同时得出D值与破坏形态的对应关系。对比素混凝土,证明碳纤维布能提高混凝土抗冲击能力。

To study the dynamic mechanical properties of concrete that radial constrained with CFRP under the impact of strong dynamic load,the accumulative shock compression test for C40 concrete specimens and the CFRP wrapped C40 concrete specimens were performed using split Hopkinson bar（SHPB） technique to obtain average strain rate,failure stress and failure strain,etc.under different impact and loading conditions.At the same time,the damage of the specimens was detected by using surface perspective method,and the accumulative damage property was discussed through several effective impact experiments.The comparative analysis of the two types of specimen shows that the ductility and the strength of the CFRP wrapped concrete can be improved,especially the former.The relationship between the D value and the failure mode was got.Compared with the plain concrete,it is proved that CFRP can enhance the impact resistance of concrete.