Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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The Effect of Fiber Volume Fraction on the Tension Softening Behavior of Steel Fiber-Reinforced Ultra High Strength Concrete

섬유혼입률이 강섬유보강 초고강도 콘크리트의 인장연화거동에 미치는 영향

  • Kang, Su-Tae (Structural Engineering & Bridges Research Division, Korea lnstitute of Construction Technology) ;
  • Hong, Ki-Nam (Dept. of Civil Engineering, Chungbuk National University) ;
  • Han, Sang-Hoon (Dept. of Civil Engineering, Chungbuk National University) ;
  • Kim, Sung-Wook (Structural Engineering & Bridges Research Division, Korea lnstitute of Construction Technology)
  • 강수태 (한국건설기술연구원 구조교량연구실) ;
  • 홍기남 (충북대학교 토목공학과) ;
  • 한상훈 (충북대학교 토목공학과) ;
  • 김성욱 (한국건설기술연구원 구조교량연구실)
  • Published : 2009.02.28
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Abstract

The influence of steel fiber volume on the tension softening behavior in steel fiber-reinforced ultra high strength concrete was investigated. Three-point bending test (TPBT) with notched beams was performed and inverse analysis method by Uchida et al. was adopted to obtain the tension softening behaviors from the results of TPBT. It could be found that the intial stiffness was constant regardless of steel fiber volume, the increase of steel fiber volume fraction made the tensile strength higher, but all of the curves converged on an asymptote with a crack width. It was proposed the equation of softening curve expressed by combination of plastic behavior part and exponential descending behavior part considering the steel fiber volume fraction and $\omega_0$, which is corresponding to the maximum crack width of plastic area. Thereafter, the crack propagation analysis using finite element method with smeared crack model was also carried out and it was confirmed that the proposed equation had a good agreement with the experimental results.

본 연구에서는 섬유혼입률이 초고강도 강섬유보강 콘크리트의 인장연화거동 특성에 미치는 영향을 파악하고자 하였다. 노치 낸 보에 대한 3점 재하 휨실험을 통해 초고강도 강섬유보강 콘크리트의 휨인장 거동을 구하고, Uchida 등이 제안한 역해석법을 사용하여 휨 실험 결과로부터 인장연화곡선을 도출하였다. 노치 낸 보의 휨 실험 결과에서 초기강성은 섬유혼입률에 관계없이 일정한 값을 나타내고, 강섬유의 혼입률이 증가할수록 초고강도 강섬유보강 콘크리트의 휨인장강도는 증가하며 연화거동은 일정 균열폭에서 점근적으로 수렴하는 경향을 나타내었다. 역해석을 통해 구한 인장연화곡선으로부터 섬유혼입률과 임계균열폭, $\omega_0$의 함수로 인장연화모델을 제안하였으며, 인장연화모델은 균열이 진행됨에 따라 일정한 인장응력 값을 가지는 소성구간과 지수함수로 주어지는 연화구간으로 나누어 제시하였다. 본 연구에서 제시한 인장연화모델을 적용하여 점성균열모델을 이용한 유한요소해석을 수행한 결과, 해석 결과와 실험 결과와 잘 일치하는 것으로 나타났다.

Keywords

References

  1. Shah, S. P., “Do Fibers Increase the Tensile Strength of Cement-Based Matrixes?,”ACI Materials Journal, Vol. 86, No. 6, 1991, pp. 595-602
  2. Balaguru, P. N. and Shah, S. P., Fiber-Reinforced Cement Composites, New York, McGraw-Hill, 1992
  3. Nawy E. G., Fundamentals of High-Performance Concrete, New York, John & Wiley, 2001
  4. Banthia, N., Bindiganavile, V., and Mindess, S., “Impact Resistance of Fiber Reinforced Comcrete,”Proceeding of RILEM 4th International Workshop on High Performance Fiber Reinforced Cement Composites(HPFRCC4), Ann Arbor, USA, 2003, pp. 117-131.
  5. Shah, S. P., Sarigaphuti, M., and Karguler, M. E., Comparison of Shrinkage Cracking Performance of Different Types of Fibers and Wiremesh, Fiber Reinforced Concrete Developments and Innovations, Michigan, American Concrete Institute, 1994, pp. 1-18
  6. Richard, P. and Cheyrezy, M, “Composition of Reactive Powder Concrete,”Cement and Concrete Research, Vol. 25, No. 7, 1995, pp. 1501~1511. https://doi.org/10.1016/0008-8846(95)00144-2
  7. Bonneau, O., et al., “Mechanical Properties and Durability of Two Industrial Reactive Powder Concretes,”ACI Materials Journal, Vol. 94, No. 4, 1997, pp. 286~290.
  8. de Oliveira e Sousa, J. L. A. and Gettu, R., “Determining the Tensile Stress-Crack Opening Curve of Concrete by Inverse Analysis,”Journal of Engineering Mechanics, Vol. 132, No. 2, 2006, pp. 141-148 https://doi.org/10.1061/(ASCE)0733-9399(2006)132:2(141)
  9. de Oliveira e Sousa, J. L. A. and Gettu, R., “Inverse Analysis of Notched-Beam Test Data for Obtaining Tensile Stress-Crack Opening Relation of Fiber Reinforced Concrete,” Symposium on Fibre-Rinforced Concrete Befib, 2004, pp. 809-818.
  10. Mihashi, H., Kikuchi, T., Akita, H., and Yamada, H., “Simplified Method to Evaluate Tensile Strain Performance of Ductile Fiber Reinforced Cementitious Composites,”CAJ Proceedings of Cement & Concrete, No. 60, 2007, pp. 483-490.
  11. Wang, Y, Li, V. C., and Backer, S., “Experimental Determination of Tensile Behavior of Fiber Reinforced Concrete,” ACI Materials Journal, Vol. 87, No. 5, 1990, pp. 461-468.
  12. Naaman, A. E., Fisher, G., and Krstulovic-Opara, N., Measurement of Tensile Properties of Fiber Reinforced Concrete: Draft Submitted to ACI Committee 544, High Performance Fiber Reinforced Cement Composites (HPFRCC5), 2007, pp. 3-12
  13. Kagawa, Y. and Sekine, K., “Toughening by Continuous Single Fiber Bridging in Ceramic Matrix Composite,”Materials Science & Engineering, Properties, Microstructure and Processing. A, Structural Materials, Vol. 221, No. 1/2, 1996, pp. 163-172. https://doi.org/10.1016/S0921-5093(96)10512-8
  14. Park, J. S., Katoh, Y., Kohyama, A., Lee, S. P., and Yoon, H. K., “Evaluation of Fracture Toughness of Ceramic Matrix Composites Using Small Specimens,”Fusion Engineering and Design, Vol. 61/62, 2002, pp. 733-738. https://doi.org/10.1016/S0920-3796(02)00150-3
  15. Reza, F., Yamamuro, J. A., and Batson, G. B., “Electrical Resistance Change in Compact Tension Specimens of Carbon Fiber Cement Composites,”Cement & Concrete Composites, Vol. 26, No. 7, 2004, pp. 873-881. https://doi.org/10.1016/j.cemconcomp.2003.06.002
  16. Japan Concrete Institute, Method of Test for Fracture Energy of Concrete by Use of Notched Beam JCI-S-001-2003, http://www.jci-web.jp/jci_standard/
  17. RILEM TC 162-TDF, “Test and Design Methods for Steel Fiber Reinforced Concrete,”Materials and Structures, Vol. 33, 2000, pp. 3-5. https://doi.org/10.1007/BF02481689
  18. Kitsutaka, Y., Fracture Parameters for Concrete Based on Poly-Linear Approximation Analysis of Tension Softening Diagram, FRAMCOS-2, Germany, AEDIFICATION, 1995
  19. Kitsutaka, Y., “Fracture Parameters by Poly-Linear Tension Softening Analysis,”Journal of Engineering Mechanics Vol.123, No.5, 1997, pp.444-450. https://doi.org/10.1061/(ASCE)0733-9399(1997)123:5(444)
  20. Uchida, Y. and Kurihara, N., “Determination of Tension Softening Diagrams of Various Kinds of Concrete by Means of Numerical Analysis,”FRAMCOS-2, Germany, AEDIFICATION, 1995.
  21. Japan Concrete Institute, Method of Test for Load-Displacement Curve of Fiber Reinforced Concrete by Use of Notched Beam JCI-S-002-2003, http://www.jci-web.jp/jci_standard/
  22. 田中など, “超高强度纖維補强コンクリトの引張特性と引張軟化曲線のモデル化,”日本土木學會論文集, Vol. 67, No. 788, 2005, pp. 159-73.
  23. Liaw, B. M., Jeang, F. L., Du, J. J., Hawkins, N. M., and Kobayashi, A. S., “Improved Non-Linear Model for Concrete Fracture,”Journal of Engineering Mechanics, ASCE, Vol. 116, No. 2, 1990, pp. 429-445. https://doi.org/10.1061/(ASCE)0733-9399(1990)116:2(429)

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