复合材料科学与工程 ›› 2023, Vol. 0 ›› Issue (6): 80-87.DOI: 10.19936/j.cnki.2096-8000.20230628.012

• 应用研究 • 上一篇    下一篇

不同应变率下碳纤维布约束混凝土单轴压缩力学性能试验研究

宋萌萌1, 吴文飞2, 周恒3   

  1. 1.四川托普信息技术职业学院,成都 611743;
    2.西南交通大学 交通隧道工程教育部重点实验室,成都 610031;
    3.中国三峡建工(集团)有限公司,成都 611730
  • 收稿日期:2023-01-10 出版日期:2023-06-28 发布日期:2023-08-22
  • 作者简介:宋萌萌(1986—),女,硕士,讲师,研究方向为建筑材料与工程造价,Songmm20230109@163.com。
  • 基金资助:
    国家自然科学基金(52108419)

Experimental study on mechanical properties of concrete confined by carbon fiber cloth under uniaxial compression at different strain rates

SONG Mengmeng1, WU Wenfei2, ZHOU Heng3   

  1. 1. Sichuan Top IT Vocational Institute, Chengdu 611743, China;
    2. Key Laboratory of Ministry of Education for Traffic Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031, China;
    3. China Three Gorges Construction Engineering Corporation, Chengdu 611730, China
  • Received:2023-01-10 Online:2023-06-28 Published:2023-08-22

摘要: 碳纤维布对混凝土材料的约束保护作用能够极大提升其力学性能。本文基于试验,采用电液伺服压力机及分离式霍普金森压杆装置(Split Hopkinson Pressure Bar,SHPB)对碳纤维布约束混凝土开展不同应变率下的单轴压缩试验,分析应变率、碳纤维布层数及混凝土强度对碳纤维布约束混凝土应力-应变曲线、峰值应力、动态增强因子DIF(dynamic increase factors)及韧性的影响规律。试验结果表明:不同应变率下试件峰值应力均随碳纤维布层数的增加而增大,两者呈指数函数负相关。应变率的增大使得试件DIF增加,两者呈指数函数正相关,试件存在明显的应变率效应。随着粘贴纤维布层数的增加,C30混凝土试件应变率效应更加敏感。随着混凝土强度等级的提升,碳纤维布层数对试件DIF影响程度降低。应变率、混凝土强度等级及碳纤维布粘贴层数的增加均使试件韧性增大。碳纤维布的约束保护作用能够增加试件的延性,防止混凝土结构物产生脆性破坏,对提升结构物的安全性具有重要意义。

关键词: 碳纤维布, 应变率, 应力-应变曲线, 峰值应力, 动态增强因子, 韧性, 复合材料

Abstract: The restraining and protective effect of carbon fiber cloth on concrete materials can greatly improve their mechanical properties. This paper analyzes the effects of strain rate, number of layers of carbon fiber cloth and concrete strength on the stress-strain curve, peak stress, DIF (dynamic increase factors) and toughness of carbon fiber cloth-constrained concrete based on the uniaxial compression tests with different strain rates using an electro-hydraulic servo press and a split Hopkinson pressure bar (SHPB). The test results showed that the peak stress of the specimens at different strain rates increased with the increase of the number of carbon fiber cloth layers, and the two were negatively correlated as an exponential function. The increase of strain rate makes the specimen DIF increase, and the two are positively correlated as an exponential function, and there is a significant strain rate effect on the specimen. C30 concrete is more sensitive to the strain rate effect of the specimen with the increase of the number of pasted fiber cloth layers, and the degree of influence of the number of carbon fiber cloth layers on the DIF of the specimen decreases with the increase of the concrete strength grade. The increase of strain rate, concrete strength grade and the number of layers of carbon fiber cloth paste increase the toughness of specimens. The restraining and protective effect of carbon fiber cloth can increase the ductility of the specimens and prevent the concrete structure from brittle damage, which is important to enhance the safety of the structure.

Key words: carbon fiber cloth, strain rate, stress-strain curve, peak stress, DIF, toughness, composite material  ,  ,  

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