陈璋,陈徐东,冯璐,宋小海

• 1:河海大学土木与交通学院
• 2:中国核工业华兴建设有限公司西南分公司

摘要(Abstract)：

【目的】为了研究掺有钢纤维的超高性能混凝土(UHPC)在冲击压缩作用下的力学特性与损伤特征，【方法】基于被动围压的霍普金森压杆，保持冲击气压为0.4 MPa不变，分别测试得到不同钢纤维掺量、不同含水状态UHPC试样的应力—应变曲线，并对其峰值应力、应变、能量耗散特性、损伤演化特征进行分析。【结果】结果显示：钢纤维在UHPC中网状分布，发挥桥接作用使试样动态抗压强度提高，钢纤维掺量为1%时动态抗压强度达到峰值，后随掺量增加有所降低，极限应变变化趋势与动态抗压强度相反，饱和试样峰值应力低于干燥试样，约为干燥试样的80%。【结论】计算了试样在加载三阶段的能量耗散，发现钢纤维可以降低荷载做功。此外，结合耗散能定义了损伤变量D,分析了UHPC损伤演化三阶段，得到钢纤维对损伤演化的抑制作用。

关键词(KeyWords)： 超高性能混凝土;分离式霍普金森杆;钢纤维;被动围压;能量耗散;损伤演化

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2020YFC1511902);; 国家自然科学基金项目(51739008,51979090)

作者(Author): 陈璋,陈徐东,冯璐,宋小海

DOI: 10.13928/j.cnki.wrahe.2023.03.016

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