DOI QR코드

DOI QR Code

편심지속하중을 받는 철근콘크리트 기둥의 시간의존적 변형

Time-Dependent Deformation of RC Columns Subjected to Sustained Eccentric Loading

  • 엄태성 (대구가톨릭대학교 건축학과) ;
  • 김재요 (광운대학교 건축공학과) ;
  • 장동운 (쌍용건설(주) 건축기술부)
  • 투고 : 2012.05.23
  • 발행 : 2012.10.25

초록

Long-term deformation due to creep and shrinkage of concrete may affect the structural performance of reinforced concrete members and structures. In particular, in the case of columns and walls subjected to sustained axial load with eccentricity, both shortening by axial compression and curvature (or lateral displacement) by bending moment continue to increase over the sustained duration. In the present study, a sustained load test on reinforced concrete columns was carried out to investigate long-term shortening and lateral displacement. Column specimens were subjected to axial compression load either with or without eccentricity for a duration of 64 days. A test set-up using post-tensioning was introduced for the sustained load test. Test results showed that long-term deformations of columns such as axial shortening and lateral displacement continued to increase but the increasing rate rapidly decreased. The long-term deformations increasing with time were predicted by using the creep and shrinkage models of ACI 209. The predictions correlated relatively well with the test results. Reinforcement had substantial effect not on the long-term axial shortening, but on the long-term curvature (or lateral displacement).

키워드

과제정보

연구 과제 주관 기관 : 국토해양부

참고문헌

  1. 김창수, 박홍근, "철근콘크리트 기둥의 성능기반설계를 위한 주철근비", 한국콘크리트학회, 22(2), 2010, pp.187-197
  2. 한국콘크리트학회, 콘크리트 구조설계기준 (KCI 2007), 한국콘크리트학회, 2007.
  3. ACI Committee 209. Prediction of creep, shrinkage and temperature effects in concrete structures. ACI 209R-02, American Concrete Institute, 1997.
  4. ACI Committee 318, Building Code Requirements for Structural Concrete (ACI318-08) and Commentary (ACI318R-05), American Concrete Institute, 2008.
  5. ACI Committee 435, Control of Deflection in Concrete Structures, ACI 435R-95, American Concrete Institute, 1995. (Reapproved 2000, Appendix B Added 2003)
  6. Bazant, Z. P. and Xiang, Y., "Inelastic Buckling of Concrete Column in Braced Frame", Journal of Structural Engineering, ASCE, 123(5), 1997, pp.634-642. https://doi.org/10.1061/(ASCE)0733-9445(1997)123:5(634)
  7. Chovichien, V. Gutzwiller, M. J., and Lee, R. H., "Analysis of Reinforced Concrete Columns Under Sustained Load", ACI Journal, 70(5), 1973, pp.693-700.
  8. European Committee for Standardization, Eurocode 2: Design of concrete structures - Part 1-1: general rules and rules for buildings, BS EN 1992-1-1: 2004, British Standards Institute, London, 2004.
  9. Ghali, A. and Azarnejad, A., "Deflection Prediction of Members of Any Concrete Strength", ACI Structural Journal, 96(5), 1999, pp.807-817.
  10. Gilbert, R. I., "Deflection Calculation for Reinforced Concrete Structures - Why We Sometimes Get It Wrong", ACI Structural Journal, 96(6), 1999, pp.1027-1033.
  11. Manuel, R. F. and MacGregor, J. G., "Analysis of Restrained Reinforced Concrete Columns Under Sustained Load", ACI Journal, 64(1), 1967, pp.12-23.
  12. Park, R. and Paulay, T, Reinforced Concrete Structures, John Wiley & Sons, New York, 1975, p.769
  13. Schultz, A. E., Welton, S. S., and Rey, L. E., "Long-Term Effects on Response of Reinforced Concrete Columns to Cyclic Loading", Journal of Structural Engineering, ASCE, 130(9), 2004, pp.1320-1332. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:9(1320)
  14. Viest, I. M., Elstner, R. C., and Hognestad, E., "Sustained Load Strength of Eccentrically Loaded Short Reinforced Concrete Columns", Journal of the American Concrete Institute, 27(7), 1955, pp.727-755.
  15. Washa, G. W., and Fluck, P. G., "Effect of Compressive Reinforcement on the Plastic Flow of Reinforced Concrete Beams", ACI Journal, 49(2), 1952, pp.89-108.
  16. Yu, W.-W., and Winter, G., "Instantaneous and Long-Time Deflections of Reinforced Concrete Beams Under Working Loads", Journal of the American Concrete Institute, 32(1), 1960, pp.30-50.