华南理工大学学报(自然科学版) ›› 2019, Vol. 47 ›› Issue (7): 1-9.doi: 10.12141/j.issn.1000-565X.180645

• 土木建筑工程 •    下一篇

CFRP 约束损伤钢筋混凝土的轴压性能

劳晓杰1,2 韩小雷1,3 季静1,3 姜正荣1,3 陈彬彬1   

  1. 1. 华南理工大学 土木与交通学院,广东 广州 510640; 2. 华南理工大学 建筑设计研究院,广东 广州 510640; 3. 华南理工大学 亚热带建筑科学国家重点实验室,广东 广州 510640
  • 收稿日期:2018-12-25 修回日期:2019-03-05 出版日期:2019-07-25 发布日期:2019-06-01
  • 通信作者: 劳晓杰(1972-),男,博士生,高级工程师,主要从事混凝土结构研究. E-mail:xjlao@scut.edu.cn
  • 作者简介:劳晓杰(1972-),男,博士生,高级工程师,主要从事混凝土结构研究.
  • 基金资助:
    国家自然科学基金资助项目(51378221); 亚热带建筑科学国家重点实验室自主研究项目(2018ZC05)

Axial Compression Behavior of CFRP-confined Damaged Reinforced Concrete

LAO Xiaojie1,2 HAN Xiaolei1,3 JI Jing1,3 JIANG Zhengrong1,3 CHEN Binbin1   

  1.  1. School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China; 2. Architectural Design and Research Institute,South China University of Technology,Guangzhou 510640,Guangdong,China; 3. State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2018-12-25 Revised:2019-03-05 Online:2019-07-25 Published:2019-06-01
  • Contact: 劳晓杰(1972-),男,博士生,高级工程师,主要从事混凝土结构研究. E-mail:xjlao@scut.edu.cn
  • About author:劳晓杰(1972-),男,博士生,高级工程师,主要从事混凝土结构研究.
  • Supported by:
    Supported by the National Natural Science Foundation of China (51378221)

摘要: 设计了 29 个不同配箍率、CFRP 层数及预损伤水准的钢筋混凝土(RC)方柱试件 进行轴压试验;通过对试验数据的回归分析,提出了 CFRP 约束损伤钢筋混凝土的受压本 构模型. 结果表明:外包 CFRP 能有效地恢复甚至提高损伤钢筋混凝土的轴压强度及延 性,其加固效果随 CFRP 用量的增加及预损伤水准的降低更为显著;损伤钢筋混凝土的弹 性模量则随着损伤水准的增大而减少;反复荷载作用下,CFRP 约束损伤钢筋混凝土的应 力 - 应变曲线的包络线与单调荷载作用下的应力 - 应变曲线基本重合;文中提出的模型 预测与试验数据高度吻合.

关键词: CFRP, 钢筋混凝土, 轴压性能, 加固修复, 应力-应变模型

Abstract: A total of 29 square reinforced concrete (RC) columns with different amounts of internal steel rein- forcement and of externally wrapped CFRP as well as pre-damage levels,were designed and tested under axial compression. On the basis of regression analysis of the test results,a stress-strain model for CFRP-confined da- maged reinforced concrete under axial compression was proposed. The test results show that CFRP wrapping is effec- tive in restoring or even enhancing the compressive strength and the strain capacity of damaged reinforced concrete. Both the compressive strength and the ultimate strain of CFRP-confined damaged reinforced concrete increase with the increase of the quantities of CFRP and the decrease of pre-damage levels,while the initial elastic modulus de- creases with the increase of pre-damage levels. Under cyclic loading,the envelope curve of cyclic stress-strain re- sponse of CFRP-confined damaged reinforced concrete under axial compression coincides with the monotonic coun- terpart. The prediction provided by the proposed model agrees well with the test results.

Key words: CFRP, reinforced concrete, axial compression behavior, repair, stress-strain model

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