Journal of South China University of Technology(Natural Science Edition) ›› 2019, Vol. 47 ›› Issue (7): 1-9.doi: 10.12141/j.issn.1000-565X.180645

• Architecture & Civil Engineering •     Next Articles

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)

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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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