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为探究掺橡胶颗粒自密实混凝土(SCC)在冲击荷载下的力学特性,采用?75 mm分离式霍普金森压杆(SHPB)试验方法,对比分析了不同橡胶颗粒掺量SCC的冲击压缩破坏模式及其应力–应变关系,并基于应变等价性假说和统计损伤理论建立了其动态力学本构模型。结果表明:橡胶颗粒的掺入增强了SCC抵抗不同应变率条件下的破坏作用;SCC的动态强度增长因子DIF随应变率的增加而显著增大,且随橡胶掺量的增加,DIF的增长率提高;在应变率相同时,橡胶颗粒对SCC动态强度的增强效果大于普通混凝土;掺橡胶颗粒SCC弹性模量的应变率相关性不明显,但在所调查的应变率范围内,SCC弹性模量有一定的增加,橡胶掺量为0、10%、20%和30%时,其各自的平均弹性模量比静态弹性模量分别提高了35.1%、39.7%、53.3%和57.7%;所建立的本构模型与试验结果吻合较好。
In order to investigate the mechanical properties of rubber-impregnated self-compacting concrete (SCC) under impact loading, a 75 mm split Hopkinson pressure bar (SHPB) test method was used to analyze the impact compression failure modes of SCC with different rubber particles And their stress-strain relationship. Based on the strain equivalence hypothesis and statistical damage theory, the dynamic constitutive model was established. The results show that the incorporation of rubber particles enhances the destructive effect of SCC against different strain rates. The dynamic growth factor (DIF) of SCC increases with the increase of strain rate. With the increase of rubber content, the growth rate of DIF ; When the strain rate is the same, the effect of rubber particle on the dynamic strength of SCC is greater than that of ordinary concrete; the strain rate dependence of elastic modulus of SCC is not obvious, but in the range of strain rate investigated, the elastic modulus of SCC The average elastic modulus of the rubber increased by 35.1%, 39.7%, 53.3% and 57.7% respectively when the rubber content was 0, 10%, 20% and 30% The constitutive model is in good agreement with the experimental results.