Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of Seismic Performance of High Strength Reinforced Concrete Exterior Beam-Column Joints Using High Ductile Fiber-Reinforced Mortar

고인성섬유 복합모르타르를 활용한 고강도 철근콘크리트 외부 보-기둥 접합부의 내진성능평가

  • Ha, Gee-Joo (Dept. of Architectural Engineering, Kyungil University) ;
  • Shin, Jong-Hak (Dept. of Architectural Engineering, Kyungil University)
  • Received : 2012.12.28
  • Accepted : 2012.07.03
  • Published : 2013.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, experimental research was carried out to evaluate the constructability and seismic performance of high strength R/C exterior beam-column joints regions, with or without the shear reinforcement, using high ductile fiber-reinforced mortar. Five specimens of retrofitted the exterior beam-column joint regions using high ductile fiber-reinforced mortar are constructed and tested for their retrofit performances. Specimens designed by retrofitting the exterior beam-column joint regions (BCJNSP series) of existing reinforced concrete building showed a stable mode of failure and an increased its maximum load-carrying capacity by 1.09~2.03 times in comparison with specimen of BCJNS due to the effect of enhancing dispersion of crack control at the time of initial loading and bridging of fiber from retrofitting new high ductile materials during testing. Specimens of BCJNSP series attained its maximum load carrying capacity by 0.92~0.96 times and increased its energy dissipation capacity by 1.62 times when compared to standard specimen of BCJC with a displacement ductility of 4.

이 연구에서는 고강도 철근콘크리트 외부 보-기둥 접합부의 시공성 및 내진성능을 개선하기 위하여 보-기둥 접합부 영역의 스터럽 및 띠철근 유무에 따라 고인성섬유 복합모르타르를 사용하여 내진성능을 평가하였다. 총 5개의 실험체를 제작하고 실험을 수행하여 내진성능을 평가하였으며, 이 연구의 시험 결과를 근거로 다음과 같은 결론을 얻었다. 기존 고강도 철근콘크리트 내부 보-기둥 접합부의 위험단면 영역을 고인성섬유 복합모르타르로 보강한 결과 재하 전 과정을 통하여 섬유의 가교역할로 인한 균열 분산효과로 인하여 균열 제어 효과가 커서 안정적인 파괴형태 및 내력을 나타내었다. 고강도 철근콘크리트 외부 보-기둥 접합부의 시공성 및 내진성능을 개선하기 위하여 고인성섬유 복합모르타르를 사용하여 보강한 실험체(BCJNSP 시리즈)는 스터럽과 띠철근이 제거 되었음에도 안정적인 이력거동을 나타내었고, 최대내력이 전단보강근이 없는 실험체 BCJNS의 1.09~2.03배로 증가하였다. 그리고 고인성섬유 복합모르타르를 사용하여 보강한 실험체(BCJNSP 시리즈)는 표준실험체 BCJC의 최대내력이 0.92~0.96배로 거의 비슷하였고, 에너지소산능력은 최대 1.62배로 크게 증가하였다.

Keywords

References

  1. Ha, G. J., Kim, J. K., and Chung, L., "Response of Reinforced High-Strength Concrete Beam-Column Joints Under Load Reversals," Magazine of Concrete Research, Vol. 44, No. 160, 1992, pp. 175-184. https://doi.org/10.1680/macr.1992.44.160.175
  2. Ha, G. J., Yang, J. K., Kim, J. K., and Chung, L., "Behavior of Reinforced High-strength Concrete Beam-Column Joint Under Load Reversals," Journal of the Architectural Institute of Korea, Vol. 8, No. 9, 1992, pp. 231-240.
  3. Ha, G. J., Kim, J. K., and Chung, L., "Improvement of Earthquake-Resistant Performance of R/C Beam-Column Joint Constructed with High-Strength Concrete Subjected to Cyclic Loading," Journal of the Korea Concrete Institute, Vol. 4, No. 1, 1992, pp. 135-145.
  4. Ha, G. J., Shin, J. H., and Kim, Y. Y., "Evaluation of Structural Performance for the Shear Wall using High Ductile Fiber Composite Mortar," Journal of the Regional Association of Architectural Institute of Korea, Vol. 7, No. 1, 2005, pp. 39-45.
  5. Ha, G. J., "Evaluation of Structural Performance of Reinforced Concrete Beam Using New Fiber Composite Material and Ground Granulated Blast Furnace Slag," Journal of the Regional Association of Architectural Institute of Korea, Vol. 12, No. 3, 2010, pp. 261-268.
  6. Ha, G. J., Hong, K. H., and Lee, D. G., "Improvement and Evaluation of Shear Performance of R/C Beam using High Ductile Fiber-Reinforced Mortar with Ground Granulated Blast Furnace Slag," Journal of the Regional Association of Architectural Institute of Korea, Vol. 13, No. 1, 2011, pp. 237-244.
  7. Kim, Y. Y., Kim, J. S., Ha, G. J., and Kim, J. K., "Development of an ECC (Engineered Cementitious Composite) Designed with Ground Granulated Blast Furnace Slag," Journal of the Korea Concrete Institute, Vol. 18, No. 1, 2006, pp. 21-28. https://doi.org/10.4334/JKCI.2006.18.1.021
  8. Kim, Y. Y., Ha, G. J., and Shin, J. H., "Design of ECC (Engineered Cementitious Composite) Matrix Compositions Based on Micromechanics and Steady-State Cracking Theory," Journal of the Architectural Institute of Korea, Vol. 23, No. 5, 2007, pp. 11-18.
  9. Kim, Y. Y., Cho, C. G., Ha, G. J., and Bae, S. H., "Strategies for High Performance Fiber Reinforced Cementitious Composites Development," Magazine of the Korea Concrete Institute, Vol. 18, No. 3, 2006, pp. 82-86.
  10. Kim, J. J. H., Yun, H. D., and Jeon, E., "Material Design, Characteristics and Application of Engineered Cementitious Composites," Magazine of the Korea Concrete Institute, Vol. 18, No. 1, 2006, pp. 28-35.
  11. Yang, I. S., Yun, H. D., Kim, S. W., Park, W. S., Han, B. Ch., and Moon, Y. J., "Hysteretic Characteristics of Seismic Devices using High Performance Fiber Reinforced Cement Composites," Journal of the Architectural Institute of Korea, Vol. 21, No. 1, 2005, pp. 51-58.
  12. Choi, K. B., Chung, L., and Ha, G. J., "Detailed Design of Multi-Story Reinforced Concrete Building Under Lateral Load," Magazine of the Korea Concrete Institute, Vol. 8, No. 6, 1996, pp. 39-51.
  13. Li, V. C., Wang, Y., and Backer, S., "A Micromechanical Model of Tension-Softening and Bridging Toughening of Short Random Fiver Reinforced Brittle Matrix Composites," Journal of the Mechanics and Physics of Solids, Vol. 39, Issue, 5, 1991, pp. 607-625. (doi: http://dx.doi.org/10.1016/0022-5096(91)90043-N)
  14. Li, V. C. and Wu, H. C., "Condition for Pseudo Strain-Hardening in Fiber Reinforced Brittle Matrix Composites," Journal of Applied Mechanics Review, Vol. 45, Issue 8, 1992, pp. 390-398. https://doi.org/10.1115/1.3119767
  15. Marshall, D. B. and Cox, B. N., "A J-Integral Method for Calculating Steady-State Matrix Cracking Stresses in Composite," Mechanics of Materials, Vol. 7, Issue 2, 1998, pp. 127-133.(doi: http://dx.doi.org/10.1016/0167-6636(88)90011-7).