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Steel and Composite Structures
  Volume 23, Number 6, April30 2017 , pages 727-736

Stereo-digital image correlation in the behavior investigation of CFRP-steel composite members
Yun-Tong Dai, Hai-Tao Wang, Tian-Yuan Ge, Gang Wu, Jian-Xiao Wan, Shuang-Yin Cao, Fu-Jun Yang and Xiao-Yuan He

    The application of carbon fiber reinforced polymer (CFRP) in steel structures primarily includes two categories, i.e., the bond-critical application and the contact-critical application. Debonding failure and buckling failure are the main failure modes for these two applications. Conventional electrometric techniques may not provide precise results because of the limitations associated with single-point contact measurements. A nondestructive full-field measurement technique is a valuable alternative to conventional methods. In this study, the digital image correlation (DIC) technique was adopted to investigate the bond behavior and buckling behavior of CFRP-steel composite members. The CFRP-to-steel bonded joint and the CFRPstrengthened square hollow section (SHS) steel column were tested to verify the suitability of the DIC technique. The stereo- DIC technique was utilized to measure continuous deformation. The bond-slip relationship of the CFRP-to-steel interface was derived using the DIC data. Additionally, a multi-camera DIC system consisting of four stereo-DIC subsystems was proposed and applied to the compressive test of CFRP-strengthened SHS steel column. The precise buckling location and CFRP delamination of the CFRP-strengthened SHS steel column were identified. The experimental results confirm that the stereo-DIC technique can provide effective measurements for investigating the behaviors of CFRP-steel composite members.
Key Words
    CFRP; steel; bond behavior; buckling behavior; digital image correlation
(1) Yun-Tong Dai, Tian-Yuan Ge, Fu-Jun Yang, Xiao-Yuan He:
Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing, P.R. China;
(2) Yun-Tong Dai, Tian-Yuan Ge, Fu-Jun Yang, Xiao-Yuan He:
Department of Engineering Mechanics, Southeast University, Nanjing, P.R. China;
(3) Hai-Tao Wang, Gang Wu:
Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing, P.R. China;
(4) Jian-Xiao Wan, Shuang-Yin Cao:
School of Civil Engineering, Southeast University, Nanjing, P.R. China.

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