Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

An experimental and numerical study on long-term deformation of SRC columns

  • An, Gyeong-Hee (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Seo, Jun-Ki (Construction & Environment Team, Gyeongin Construction Headquarters, Korea Electric Power Corporation) ;
  • Cha, Sang-Lyul (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Jin-Keun (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2017.01.31
  • Accepted : 2018.08.03
  • Published : 2018.09.25
⟨ Previous Next ⟩

Abstract

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 long-term 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.

Keywords

Acknowledgement

Supported by : NRF

References

  1. Abbasnia, R., Kanzadi, M., Zadeh, M.S. and Ahmadi, J. (2009), "Prediction of free shrinkage strain related to internal moisture loss", Int. J. Civil Eng., 7(2), 92-98.
  2. Akita, H., Fujiwara, T. and Ozaka, Y. (1990), "Water movement within mortar due to drying and wetting", Proceeding of JSCE, 420, 61-69. (in Japanese)
  3. An, G.H., Kwon, S.H. and Kim, J.K. (2015), "Effect of wideflange-steel geometry on the long-term shortening of steelreinforced concrete columns", Mag. Concrete Res., 67(23), 1242-1256. https://doi.org/10.1680/macr.14.00122
  4. ASTM C157 (2014), Standard Test Method for Length Change of Hardened Hydraulic-cement Mortar and Concrete, American Society for Testing Materials; West Conshohocken, PA, USA.
  5. ASTM C192 (2016), Standard Practice for Making and Curing Concrete Test Specimens in the Laboratory, American Society for Testing Materials, West Conshohocken, PA, USA.
  6. ASTM C39 (2016), Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens, American Society for Testing Materials, West Conshohocken, PA, USA.
  7. Azenha, M., Sousa, C., Faria, R. and Neves, A. (2011), "Thermohygro- mechanical modelling of self-induced stresses during the service life of RC structures", Eng. Struct., 33(12), 3442-3453. https://doi.org/10.1016/j.engstruct.2011.07.008
  8. Ba, M.F., Qian, C.X. and Gao, G.B. (2014), "Nonlinear calculation of moisture transport in underground concrete", Comput. Concrete, 13(3), 361-375. https://doi.org/10.12989/cac.2014.13.3.361
  9. Bazant, Z.P. and Baweja, S. (1995), "Creep and shrinkage prediction model for analysis and design of concrete structures-model B3", Mater. Struct., 28(6), 357-365. https://doi.org/10.1007/BF02473152
  10. Bazant, Z.P. and Najjar, L.J. (1972), "Nonlinear water diffusion in nonsaturated concrete", Mater. Struct., 5(1), 3-20.
  11. Bazant, Z.P. and Thonguthai, W. (1978), "Pore pressure and drying of concrete at high temperature", J. Eng. Mech., ASCE, 104(EM5), 1059-1079.
  12. Bazant, Z.P. and Xi, Y. (1994), "Drying creep of concrete: constitutive model and new experiments separating its mechanisms", Mater. Struct., 27(1), 3-14. https://doi.org/10.1007/BF02472815
  13. Chari, M.N., Shekarchi, M., Ghods, P. and Moradian, M. (2016), "A simple practical method for determination of moisture transfer coefficient of mature concrete using a combined experimental-numerical approach", Comput. Concrete, 18(3), 367-388. https://doi.org/10.12989/cac.2016.18.3.367
  14. Federation Internationale du Beton (fib) (2013), fib Model Code for Concrete Structures 2010, Ernst&Sohn.
  15. Idiart, A., Lopez, C. and Carol, I. (2011), "Modeling of drying shrinkage of concrete specimens at the meso-level", Mater. Struct., 44(2), 415-435. https://doi.org/10.1617/s11527-010-9636-2
  16. Kim, J.K. and Lee, C.S. (1998) "Prediction of differential drying shrinkage in concrete", Cement Concrete Res., 28(7), 985-994. https://doi.org/10.1016/S0008-8846(98)00077-5
  17. KS F 2403 (2014), Standard Test Method for Making and Curing Concrete Specimens, Korean Industrial Standards, Seoul, Republic of Korea.
  18. KS F 2405 (2010), Standard Test Method for Compressive Strength of Concrete, Korean Industrial Standards, Seoul, Republic of Korea.
  19. KS F 2424 (2015), Standard Test Method for Length Change of Mortar and Concrete, Korean Industrial Standards, Seoul, Republic of Korea.
  20. Mihashi, H. and Numao, T. (1989), "Influence of curing condition on a diffusion process of concrete at elevated temperatures", Proc. JPN Concrete Inst., 11(1), 229-234.
  21. Patel, R., Phung, Q., Steetharam, S., Perko, J., Jacques, D., Maes, N., Schutter, G., Ye, G. and Breugel, K. (2016), "Diffusivity of saturated ordinary Portland cement-based materials: A critical review of experimental and analytical modelling approaches", Cement Concrete Res., 90, 52-72. https://doi.org/10.1016/j.cemconres.2016.09.015
  22. Sakata, K. (1983), "A study on moisture diffusion in drying and drying shrinkage of concrete", Cement Concrete Res., 13(2), 216-224. https://doi.org/10.1016/0008-8846(83)90104-7
  23. Seol, H.C., Kwon, S.H., Yang, J.K. and Kim, J.K. (2008), "Effect of differential moisture distribution on the shortening of steelreinforced concrete columns", Mag. Concrete Res., 60(5), 313-322. https://doi.org/10.1680/macr.2008.00018
  24. Zhang, W., Tong, F., Gu, X. and Xi, Y. (2015), "Study on moisture transport in concrete in atmospheric environment", Comput. Concrete, 16(5), 775-793. https://doi.org/10.12989/cac.2015.16.5.775

Cited by

  1. Axial behavior of steel reinforced lightweight aggregate concrete columns: Analytical studies vol.38, pp.2, 2018, https://doi.org/10.12989/scs.2021.38.2.223