高性能纤维混凝土的动力学特性数值仿真分析

高性能纤维混凝土(HPFRC)作为新兴建筑材料,凭借其高性能被广泛使用。然而,其在冲击荷载下的动力学特性还有待深入研究。该研究旨在通过数值仿真分析,探讨C40-HPFRC在冲击荷载增加过程中的损伤破坏问题。采用ANSYS/LS-DYNA建立C40-HPFRC的数值模型,施加冲击荷载进行仿真分析。同时,对损伤破坏的原因进行细致讨论,研究结果表明,①在冲击荷载作用下,C40-HPFRC出现不同程度的损伤破坏,当冲击荷载由0.1 MPa增加至0.3 MPa过程中,冲击荷载越大,混凝土的损伤破坏越严重;②C40-HPFRC损伤破坏后出现“留芯”现象,小冲击荷载作用下该现象比较明显,随着冲击荷载的增加该现象逐渐消失;③随着冲击荷载的增加,C40-HPFRC的冲击强度逐渐增大,冲击荷载由0.1 MPa增加至0.3 MPa过程中,冲击强度的增长幅度分别为1.8%和18.4%。

High-performance fiber reinforced concrete(HPFRC)is extensively utilized as a new building material due to its exceptional performance.Nonetheless,there is a need for further investigation into the dynamic properties of C40-HPFRC under impact loads.This study aims to analyze the damage and failure of C40-HPFRC subjected to increasing impact loads through numerical simulation using ANSYS/LS-DYNA.The research findings reveal that,①C40-HPFRC experiences varying degrees of damage and failure under impact loads,with more severe damage observed as the loads increase from 0.1 MPa to 0.3 MPa;②a"core retention"phenomenon is observed after damage and failure in C40-HPFRC,which is more pronounced at lower impact loads but diminishes with increasing loads;and③with the increase of impact load,the impact strength of C40-HPFRC increases gradually,and the increase of impact strength is 1.8%and 18.4%respectively when the impact load increases from 0.1 MPa to 0.3 MPa.