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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (6): 1937-1946.DOI: 10.16552/j.cnki.issn1001-1625.2025.1156

• 水泥混凝土 • 上一篇    下一篇

基于SHPB与直剪装置的UHPC力学性能试验研究

杨恒1,2(), 李萌萌1,2, 陈江瑛1,2()   

  1. 1.宁波大学压力容器与管道安全浙江省工程研究中心,宁波 315211
    2.宁波大学冲击与安全工程教育部重点实验室,宁波 315211
  • 收稿日期:2025-11-19 修订日期:2026-01-06 出版日期:2026-06-15 发布日期:2026-07-14
  • 通信作者: 陈江瑛,博士,教授。E-mail:chenjiangying@nbu.edu.cn
  • 作者简介:杨 恒(1999—),男,硕士研究生。主要从事超高性能混凝土的研究。E-mail:2311090038@nbu.edu.cn
  • 基金资助:
    宁波市科技创新2025重大项目(2022Z209);国家自然科学基金(11572163);国家自然科学基金(11832013)

Experimental Study on Mechanical Properties of UHPC Based on SHPB and Direct Shear Apparatus

YANG Heng1,2(), LI Mengmeng1,2, CHEN Jiangying1,2()   

  1. 1.Zhejiang Provincial Engineering Research Center for the Safety of Pressure Vessel and Pipeline,Ningbo University,Ningbo 315211,China
    2.Key Laboratory of Impact and Safety Engineering of Ministry of Education,Ningbo University,Ningbo 315211,China
  • Received:2025-11-19 Revised:2026-01-06 Published:2026-06-15 Online:2026-07-14

摘要:

在实际工程中混凝土构件不仅承受压缩载荷,还常需承受拉伸与剪切载荷,探究超高性能混凝土(UHPC)在不同应力状态及加载速率下的力学行为对结构安全性设计至关重要。本文利用万能试验机、分离式霍普金森压杆(SHPB)及自行设计的直剪装置,分别对掺入与未掺入钢纤维的UHPC开展了准静态和动态加载下的压缩、劈拉及剪切试验。结果表明:无论是在准静态还是在动态条件下,钢纤维的掺入均显著提升了UHPC的各项力学指标;掺入与未掺入钢纤维的UHPC均表现出显著的应变率强化效应。特别是在剪切试验中,钢纤维和高应变率虽然改变了应力峰值的演化特征,但并未改变试样呈Ⅰ型与Ⅱ型混合断裂的破坏模式。

关键词: 超高性能混凝土, 分离式霍普金森压杆, 直剪装置, 动态压缩, 动态劈拉, 动态剪切

Abstract:

In practical engineering, concrete structural members are subjected not only to compressive loads but also frequently to tensile and shear loads. Therefore, investigating the mechanical behavior of ultra-high performance concrete (UHPC) under various stress states and loading rates is crucial for structural safety design. In this study, quasi-static and dynamic compression, splitting tensile, and shear tests were performed on UHPC with and without steel fibers, utilizing a universal testing machine, a split Hopkinson pressure bar (SHPB), and a self-designed direct shear apparatus. The results indicate that the incorporation of steel fibers significantly enhances the mechanical properties of UHPC under both quasi-static and dynamic conditions. Furthermore, both types of specimens (UHPC with and without steel fibers) exhibit a significant strain rate hardening effect. Specifically, in the shear tests, although the presence of steel fibers and high strain rates alter the evolution characteristics of peak stress, they do not alter the failure mode, which remains as mixture fractures of type I and type II.

Key words: ultra-high performance concrete, split Hopkinson pressure bar, direct shear apparatus, dynamic compression, dynamic splitting, dynamic shearing

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