超高性能混凝土动态压缩试验与损伤分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 115-120.

论文

超高性能混凝土动态压缩试验与损伤分析

刘季玄1，陈徐东1，石丹丹1，王璐瑶2，宁英杰2，甘元楠3

作者信息 +

Dynamic compression tests and damage analysis for ultrahigh performance concrete

LIU Jixuan1, CHEN Xudong1, SHI Dandan1, WANG Luyao2, NING Yingjie2, GAN Yuannan3

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摘要

为探究超高性能混凝土（ultra-high performance concrete，UHPC）在动态压缩下的损伤特性，本文利用霍普金森杆（SHPB）装置研究了不同应变率（52 /s~368 /s）下的动态压缩力学性能，并基于数字图像相关技术对试件的破坏过程进行分析。结果表明：在冲击荷载下，UHPC试件破坏后，仍能保持完整；UHPC动态抗压强度和韧性表现出明显的应变率敏感性；随着应变率的增加，钢纤维能够更好地吸收冲击能量并抑制临界应变的增大；裂缝发展受应变率影响较大，裂缝最终宽度随应变率的增加不断增加，低应变率下裂缝最终宽度并非其最大宽度。该研究可为UHPC服役性能和损伤评估提供理论支撑。

Abstract

In order to explore the damage characteristics of ultra-high performance concrete (UHPC) under dynamic compression, the dynamic compressive mechanical properties of UHPC under different strain rates (52 /s ~ 368 /s) were studied by split Hopkinson pressure bar (SHPB) device, and the failure process of the specimen was analyzed based on DIC technology. The failure process of the specimen was analyzed based on high-speed camera and DIC technology. The results show that Under the impact load, the UHPC specimen can still remain intact after failure. The dynamic compressive strength and toughness of UHPC show obvious strain rate sensitivity. With the increase of strain rate, steel fiber can better absorb impact energy and restrain the increase of critical strain. Under different strain rates, the early development rate of cracks is basically the same, and the final width of cracks increases with the increase of strain rate. The crack development is greatly affected by the strain rate, and the final width of the crack increases with the increase of the strain rate. The final width of the crack at low strain rate is not its maximum width. This study provides a theoretical support for the service performance and damage assessment of UHPC.

导出引用

刘季玄1，陈徐东1，石丹丹1，王璐瑶2，宁英杰2，甘元楠3. 超高性能混凝土动态压缩试验与损伤分析[J]. 振动与冲击, 2024, 43(9): 115-120

LIU Jixuan1, CHEN Xudong1, SHI Dandan1, WANG Luyao2, NING Yingjie2, GAN Yuannan3. Dynamic compression tests and damage analysis for ultrahigh performance concrete[J]. Journal of Vibration and Shock, 2024, 43(9): 115-120

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