Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Evaluation on Moment-Curvature Relations and Curvature Ductility Factor of Reinforced Concrete Beams with High Strength Materials

고강도 재료를 사용한 철근콘크리트 보의 모멘트-곡률관계 및 곡률연성지수 평가

  • Lee, Hyung-Joon (Dept. of Civil and Environmental Engineering, Hanbat National University)
  • 이형준 (한밭대학교 건설환경공학과)
  • Received : 2012.10.23
  • Accepted : 2013.03.29
  • Published : 2013.06.30
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Abstract

The high strength materials have been more widely used in reinforced concrete structures, specially, the reinforcing steel is permitted to used in RC structures up to yielding strength of 600 MPa. The strength of materials in RC beam section effects on the behavior and ductility of the RC members. In this study, the numerical analysis has been conducted to obtain the complete moment-curvature relation and the curvature ductility factor for the rectangular RC beams sections under the various reinforcement conditions and the effects of concrete strength, yield strength of reinforcement steel on the behavior and the curvature ductility factor of RC beam sections have been evaluated. The compressive strength of concrete and yield strength of steel have effected in various manner on the behavior and the curvature ductility factor of RC beam sections under reinforcement conditions. In the case of beam sections with equal resisting moment. the curvature ductility factor of RC beam section decreased with an increase in the yield strength of steel and increased with an increase in the concrete strength. When the yield strength of steel increased from 400 MPa to 600 MPa, the curvature ductility factor reduced about 30% and as the concrete strength increased from 30 MPa to 70 MPa, the curvature ductility factor of RC beam section increased about 3 times.

콘크리트 및 철근의 강도는 철근콘크리트 부재의 휨거동 및 연성에 많은 영향을 주며, 설계기준에서는 항복강도가 600 MPa인 고강도 철근의 사용이 허용되고 있다. 고강도 콘크리트가 RC부재의 휨거동에 미치는 영향에 대해서는 많은 연구가 진행되었으나, 고강도 철근에 대해서는 연구가 미흡한 실정이다. 이 연구에서는 고강도 콘크리트 및 철근을 사용한 직사각형 단면 RC 보 단면의 모멘트-곡률 관계를 해석적 방법으로 구하여 다양한 철근 배치 조건하에서 콘크리트 및 철근의 강도가 부재의 휨거동 및 곡률연성지수에 미치는 영향을 분석하였다. 부재의 철근 배치조건에 따라 콘크리트와 철근의 강도가 부재의 휨거동 및 연성지수에 미치는 영향은 다르게 나타났다. 공칭모멘트가 동일한 단면에서는 철근의 항복강도가 400 MPa에서 600 MPa로 증가하면 연성지수는 30% 이상 감소하고, 콘크리트 압축강도가 30 MPa에서 70 MPa로 증가하면 연성지수는 약 3배 증가하였다.

Keywords

References

  1. European Committee for Standardization, Eurocode 2, Design of Concrete Structures, Part1-1, General Rules and Rules for Buildings (EN 1992-1-1:2004), European Committee for Standardization, Brussels, 2004, 227 pp.
  2. Korea Concrete Institute, Concrete Design Code and Commentary, Kimoondang Publishing Company, Seoul, Korea, 2012, 599 pp.
  3. ACI Committee 318, Building Code Requirements for Structural Concrete (ACI318-08), American Concrete Institute, Farmington Hills, Detroit, 2008. 473 pp.
  4. Shin, S. W., Ghosh, S. K., and Moreno, J. "Flexural Ductility of Ultra-High-Strength Concrete Members," ACI Structural Journal, Vol. 86, No. 4, 1989, pp. 394-400.
  5. Lee, J. H., "Analytical Study on Ductility Index of Reinforced Concrete Flexural Members," KSCE, Journal of The Korean Society of Civil Engineers, Vol. 14, No. 3, 1994, pp. 391-402 (in Korean).
  6. Jang, I. Y., Park, H. G., Kim, S. S., Kim, J. H., and Kim, Y. G., "On the Ductility of High-Strength Concrete Beams," International Journal of Concrete Structures and Materials, Vol. 2, No. 2, 2008, pp. 115-122. https://doi.org/10.4334/IJCSM.2008.2.2.115
  7. Pam, H. J., Kwan, A. K. H., and Islam, M. S., "Flexural Strength and Ductility of Reinforced Normal-and High- Strength Concrete Beams," Proceedings of the ICE-Structures and Buildings, Vol. 146, No. 4, 2001, pp. 381-389.
  8. Ho, J. C. M., Kwan, A. K. H., and Pam, H. J., "Theoretical Analysis of Post-Peak Behavior of Normal and High Strength Concrete Beams," The Structural Design of Tall Special Buildings, 2003, pp. 109-125. (doi: http://dx.doi.org /10.1002/tal.216)
  9. Bai, Z. Z. and Au, F. T. K., "Flexural Ductility Design of High-Strength Concrete Beams," The Structural Design of Tall Special Buildings, 2011, pp. 521-542. (doi: http://dx. doi.org/10.1002/tal.714)
  10. Au, F. T. K., Leung, C. C. Y., and Kwan, A. K. H., "Flexural Ductility and Deformability of Reinforced and Prestressed Concrete Sections," Computers and Concrete, Vol. 8, No. 4, 2011, pp. 473-489. https://doi.org/10.12989/cac.2011.8.4.473
  11. Arslan, G. and Cihanli, E., "Curvature Ductility Prediction of Reinforced High-Strength Concrete Beam Sections," Journal of Civil Engineering and Management, Vol. 16, No. 4, 2010, pp. 462-470. https://doi.org/10.3846/jcem.2010.52
  12. Hong, G. H., "Flexural Performance Evaluation of Reinforced Concrete Beams with High-Strength Concrete and Reinforcing Bars," Journal of Architectural Institute of Korea, Architectural Institute of Korea, Vol. 27, No. 6, 2011, pp. 49-56 (in Korean).
  13. Ashour, S. A., "Effect of Compressive Strength and Tensile Reinforcement Ratio on Flexural Behavior of High-Strength Concrete Beams," Engineering Structures, Vol. 22, No. 5, 2000, pp. 413-423. https://doi.org/10.1016/S0141-0296(98)00135-7
  14. Attard, M. M. and Setunge, S., "The Stress-Strain Relationship of Confined and Unconfined Concrete," ACI Materials Journal, Vol. 93, No. 5, 1996, pp. 432-444.
  15. Wee, T. H., Chin, M. S., and Mansur, M. A., "Stress-Strain Relationship of High-Strength Concrete in Compression," ASCE, Journal of Materials in Civil Engineering, Vol. 8, No. 2, 1996, pp. 70-76. https://doi.org/10.1061/(ASCE)0899-1561(1996)8:2(70)
  16. Razvi, S. and Saatcioglu, M., "Confined Model for High Strength Concrete," ASCE, Journal of Structural Engineering, Vol. 125, No. 3, 1999, pp. 281-289. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:3(281)
  17. Park, R. and Paulay, T., Reinforced Concrete Structures, Wiely, New York, 1975, 769 pp.
  18. Pendyala, R., Mendis, P., and Patnaikuni, I., "Full-Range Behavior of High-Strength Concrete Members: Comparison of Ductility Parameters of High and Normal-Strength Concrete Members," ACI Structural Journal, Vol. 93, No. 1, 1996. pp. 30-35.
  19. Rashid, M. A. and Mansur, M. A., "Reinforced High- Strength Concrete Beams in Flexure," ACI Structural Journal, Vol. 102, No. 3, 2005, pp. 462-471.

Cited by

  1. Curvature ductility of high strength concrete beams according to Eurocode 2 vol.58, pp.1, 2016, https://doi.org/10.12989/sem.2016.58.1.001