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Computers and Concrete
  Volume 22, Number 3, September 2018, pages 261-267

An experimental and numerical study on long-term deformation of SRC columns
Gyeong-Hee An, Jun-Ki Seo, Sang-Lyul Cha and Jin-Keun Kim

    Long-term deformation of a steel-reinforced concrete (SRC) column is different from that of a reinforced concrete (RC) column due to the different moisture distribution. Wide-flange steel in an SRC column obstructs diffusion and makes longterm deformation slower. Previous studies analyzed the characteristics of long-term deformation of SRC columns. In this study, an additional experiment is conducted to more precisely investigate the effect of wide-flange steel on the long-term deformation of SRC columns. Long-term deformation, especially creep of SRC columns with various types of wide-flange steel, is tested. Wide-flange steel for the experiment is made of thin acrylic panels that can block diffusion but does not have strength, because the main purpose of this study is to exclusively demonstrate the long-term deformation of concrete caused by moisture diffusion, not by the reinforcement ratio. Experimental results show that the long-term deformation of a SRC column develops slower than that in a RC column, and it is slower as the wide-flange steel hinders diffusion more. These experimental results can be used for analytical prediction of long-term deformation of various SRC columns. An example of the analytical prediction is provided. According to the experimental and analytical results, it is clear that a new prediction model for long-term deformation of SRC columns should be developed in further studies.
Key Words
    long-term deformation; creep; shrinkage; steel-reinforced concrete; column shortening; moisture diffusion
Gyeong-Hee An, Sang-Lyul Cha and Jin-Keun Kim: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
Jun-Ki Seo: Construction & Environment Team, Gyeongin Construction Headquarters, Korea Electric Power Corporation, 140 Toegye-ro, Jung-gu, Seoul 04629, Republic of Korea

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