DOI QR코드

DOI QR Code

Evaluation of Ductility in Reinforced Concrete Members Using Material Models in Eurocode2

유로코드 2 재료모형을 사용한 철근콘크리트 부재의 연성도 평가

  • 최승원 (조선이공대학교 토목건설과)
  • Received : 2014.07.07
  • Accepted : 2015.02.10
  • Published : 2015.04.01

Abstract

In concrete structural design provisons, there is a minimum allowable strain of steel to ensure a ductility of RC members and a c/d is limited for the same purpose in EC2. In general, a ductility capacity of RC members is evaluated by a displacement ductility which is a ratio of ultimate displacement to yield displacement, and it is necessary to calculate accurately a yield displacement and an ultimate displacement to evaluate a displacement ductility. But a displacement in members is affected by various member characteristics, so it is hard to calculate a displacement exactly. In this study, a displacement ductility is calculated by calculating a yield displacement and an ultimate displacement through a moment-curvature relationship. The main variables examined are concrete strength, yield strength, steel ratio, spacing of confinement, axial force ratio and concrete ultimate strain. As results, as a concrete strength is increased, a ductility displacement is increased. But as yield strength, steel ratio, spacing of confinement and axial force ratio are increased, a displacement ductility is decreased. And a displacement ductility is necessary to calculate a response modification factor (R) of columns for seismic design, so it is appeared that it is important to calculate a displacement ductility more accurately.

References

  1. Adeel, Z. (2009). Response modification factor of reinforced concrete moment resisting frames in developing countries, Master's Thesis, University of Illinois at Urbana-Champaign, U.S.A..
  2. Bai, Z. Z. and Au, F. T. T. K. (2011). "Flexural ductility design of high-strength concrete beams." The Structural Design of Tall Special Buildings, pp. 521-542.
  3. Choi, S. W. and Kim, W. (2010). "Deflection calculation based on stress-strain curve for concrete in RC members." J. of the Korean Society of Civil Engineers, Vol. 30, No. 4A, pp. 383-389 (in Korean).
  4. Cusson, D. and Paultre, P. (1995). "Stress-strain model for confined high-strength concrete." J. of Structural Eng., ASCE, Vol. 121, No. 3, pp. 468-477. https://doi.org/10.1061/(ASCE)0733-9445(1995)121:3(468)
  5. Denpongpan, T. and Shima, H. (2005). "Effect of axial load on ductility of reinforced concrete columns." 30th Conference on Our World in Concrete & Structures.
  6. European Committee for Standardization (2002). Eurocode 2-design of concrete structures.
  7. Hamid, R. A., Hossein, B. and Neda, E. (2012). "Comparison of analytical and experimental results of ductility factor in reinforced concrete structures." Life Science Journal, Vol. 9, No. 4, pp. 2721-2734.
  8. Ho, J. C. M., Kwan, A. K. H. and Pam, H. J. (2003). "Theoretical analysis of post-peak behavior of normal and high strength concrete beams." The Structural Design of Tall Special Buildings, pp. 109-125.
  9. International Federation for Structural Concrete (1999). Structural concrete-manual, fib(CEB-FIP), Switzerland, Vol. 1, pp. 112-131.
  10. Karlsruhe, J. E., Concrete structures euro-design handbook, Ernst & Sohn, pp. 237-250.
  11. Kim, W., Kim, J. K., Oh, B. H., Jung, R. and Choi, W. C. (2007). Design of concrete structures, Dong Hwa Technology Publishing Co. (in Korean).
  12. Ko, S. H. (2013). "Displacement ductility of circular RC column according to the spacing spirals." J. of the Korea Institute for Structural Maintenance and Inspection, Vol. 17, No. 2, pp. 71-82 (in Korean). https://doi.org/10.11112/jksmi.2013.17.2.071
  13. Korea Concrete Institute (KCI) (2012). Concrete structural design provisions (in Korean).
  14. Lee, H. J. (2013). "Evaluation on moment-curvature relations and curvature ductility factor of reinforced concrete beams with high strength materials." J. of the Korea Concrete Institute, Vol. 25, No. 11, pp. 283-294 (in Korean). https://doi.org/10.4334/JKCI.2013.25.3.283
  15. Mander, J. B., Priestley, M. J. N. and Park, R. (1988). "Theoretical stress-strain model for confined concrete." J. of Structural Eng., ASCE, Vol. 114, No. 8, pp. 1804-1825. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:8(1804)
  16. Pam, H., J., Kwan, A. K. and Islam, M. S. (2001). "Flexural strength and ductility of reinforced normal and high strength concrete beams." Proceeding of the ICE-Structures and Buildings, Vol. 146, No. 4, pp. 381-389.
  17. Park, C. K., Chung, Y. S. and Lee, D. H. (2007). "Limited-ductile seismic design and performance assessment method of RC bridge piers based on displacement ductility." J. of the Korea Concrete Institute, Vol. 19, No. 1, pp. 19-26 (in Korean). https://doi.org/10.4334/JKCI.2007.19.1.019
  18. Rashid, M. A. and Mansur, M. A. (2005). "Reinforced high-strength concrete beams in flexure." ACI Structural Journal, Vol. 102, No. 3, pp. 462-471.
  19. Saatchioglu, M. and Razvi, S. R. (1992). "Strength and ductility of confined concrete." J. of Structural Eng., ASCE, Vol. 118 , No. 6, pp. 1590-1607. https://doi.org/10.1061/(ASCE)0733-9445(1992)118:6(1590)

Cited by

  1. Effects of elementary school neighbourhood environment on children’s play activities: a case study of GaeMyong elementary school neighbourhood pp.2161-6779, 2019, https://doi.org/10.1080/12265934.2019.1570862